PURPOSE: The carotid canal transmits the internal carotid artery through the skull base. The external opening of the carotid canal (EOCC) is frequently used as a reference point in radiological imaging and lateral skull base surgery. However, quantitative data regarding EOCC morphology and its precise spatial relationships with adjacent foramina and bony structures remain limited. METHODS: A total of 45 adult dry human skulls (90 sides) were examined. The maximum anteroposterior (APD) and lateromedial diameters (LMD) of the EOCC were measured, and EOCC morphology was classified into three types according to predefined morphometric ratios. The positional relationships of the EOCC were determined relative to the foramen ovale (FO) and the occipital condyle (OC). In addition, linear distances between the EOCC and adjacent anatomical landmarks, including the foramen spinosum, foramen jugulare, zygomatic orifice, mastoid process, and lateral plate of the pterygoid process, were recorded. All morphometric data were obtained using a digital caliper with a precision of 0.01 mm, and statistical analyses were performed using SPSS software. RESULTS: The most common EOCC configuration was Type 2, characterized by an APD greater than the LMD without exceeding twice the LMD (94.45%). The EOCC was most frequently located in oblique and anterolateral positions relative to the FO and the OC, respectively. CONCLUSION: The results provide detailed morphometric and positional data on the EOCC and contribute to a more standardized anatomical description of this region. These findings may serve as reference information for anatomical research, radiological evaluation, and surgical planning involving the lateral skull base.

The corrugator supercilii muscle (CSM) is a critical anatomical target for botulinum toxin injections and surgical interventions in migraine treatment and facial rejuvenation. However, complications such as sensory loss or vascular injury may arise due to its proximity to neurovascular structures. This study aims to delineate the precise anatomy of the CSM and its relationship with the supratrochlear (STN) and supraorbital nerves (SON) to enhance procedural safety. A cadaveric dissection was performed on 44 hemifaces of 22 formalin-fixed cadavers (11 male and 11 female). The CSM and adjacent neurovascular structures were dissected, photographed, and measured using ImageJ software. Morphometric parameters included distances related to the CSM, as well as branching patterns of the STN and SON were evaluated. The CSM length was significantly longer in females (30.53 ± 2.60 mm; 28.93 ± 2.15 mm, p = 0.032). The STN exhibited complex branching (> 3 branches) in 48 www.springer.com/00266 .

This study aims to evaluate the morphological features of the levator palpebrae superioris muscle (LPS) and the variations in the distribution of the oculomotor nerve in the muscle. 100 bilateral orbits from 50 cadavers were included in our study. In our study, the medial, lateral, and middle length, width, and thickness of the LPS were measured from 3 different points and recorded. In addition, the number of branches of the oculomotor nerve entering the LPS muscle was calculated. The medial, lateral, and middle length of LPS were 34.85 ± 5.30 mm, 34.62 ± 5.67 mm, 35.77 ± 5.31 mm on the right side and 33.66 ± 4.74 mm, 33.81 ± 4.83 mm, 34.54 ± 5.14 mm on the left side, respectively. The width of the muscle was seen to expand from proximally to distally. It was noted that the middle 1/3 thickness of the LPS was the thickest part of the muscle compared to the other parts. A total of 239 oculomotor branches entered the LPS. The middle 1/3 of the LPS was reached by 151 oculomotor nerve branches. It was noted that the largest number of oculomotor nerves entered the middle 1/3 part of LPS. The morphometric and morphological findings of LPS and branches of the oculomotor nerve may be useful in surgical planning for the LPS and levator aponeurosis and in preventing complications during surgical interventions.

ABSTRACT Introduction A review of the literature shows that most studies of the dorsal scapular nerve (DSN) have focused on morphological evaluation of the proximal part of the nerve. Morphometric studies contributing to clinical applications are limited. Therefore, we aimed to investigate the topographic and morphometric anatomy of the distal part of the DSN. Methods 13 cadavers in the Department of Anatomy, Istanbul Faculty of Medicine, were examined bilaterally. DSN dissection was performed on the anterior surface of the levator scapulae and rhomboids, and the distance to the medial border of the scapula (MBS) was recorded at different levels. The insertion lengths of the levator scapulae and rhomboids were also measured. Results Two types of DSN were observed according to the level of termination in the muscle. Contrary to its classical course, the nerve ran laterally to the MBS on the four sides. The shortest distance between the nerve and the MBS was at the level of the superior border of the rhomboid minor (4.46 ± 9.88 mm). The insertion lengths of the levator scapulae and rhomboids according to gender and the insertion length of the rhomboid minor according to the level of termination in the muscle were significant. Discussion We have obtained results that may be useful during Eden–Lange tendon transfer. The DSN is not always located medial to the MBS, it may be located lateral to it. To avoid nerve damage, we believe it is important to identify the nerve on the anterior surface of the muscles for a successful surgery.

The great auricular nerve (GAN) is the most frequently injured nerve during rhytidectomy and parotidectomy. Moreover, it has been used as a donor graft to repair certain nerves in head and neck regions for over a quarter of a century. The study focused on easily defining the anatomical trace of GAN via external occipital protuberance (EOP). The neck regions of 26 cadavers (15 males, 11 females) were dissected bilaterally. A digital caliper was utilized for distances. The number of branches and the number of branches on the sternocleidomastoid muscle (SCM) of GAN were accounted. The mean perpendicular distances of the origin point of GAN behind the SCM to the vertical and transverse lines passing over the EOP were 72.79 ± 14.52 mm and 97.48 ± 13.65 mm, respectively. Similarly, the mean perpendicular distances of the point where GAN crossed the anterior border of the SCM to the vertical and transverse lines passing over EOP were 90.35 ± 17.73 mm and 68.75 ± 15.13 mm, respectively. The perpendicular distance of the point where GAN crossed the anterior border of SCM to the vertical line passing over EOP was statistically significant between genders (p < 0.05). The mean length on the SCM and the mean branching distance were 42.17 ± 10.83 mm and 23.53 ± 13.85 mm, respectively. Additionally, the number of branches and the number of branches on the SCM was a median of 2. The morphometric data we obtained may be useful in preventing GAN injury during rhytidectomies and parotidectomies and in easily estimating the location of the nerve during GAN harvesting.

Objective: This study aimed to determine the anatomical features and clinical significance of the spinoglenoid notch and spinoglenoid ligament-membrane as well as the branches of the suprascapular nerve to the infraspinatus muscle as these structures may cause compression of this nerve. Material and Methods: Fifty sides (25 right and 25 left) were studied on 26 fixed cadavers belonging to the Department of Anatomy, & Idot;stanbul University, & Idot;stanbul Faculty of Medicine. The suprascapular nerve branches to the infraspinatus muscle and spinoglenoid ligament-membrane were examined in cadavers, and the spinoglenoid notch was investigated in 50 dry scapulae. Result: The suprascapular nerve had two branches to the infraspinatus muscle in 22 cadavers on 37 sides (74%) and three branches to this muscle in 11 cadavers on 13 sides (26%). On 31 sides the spinoglenoid membrane and on 19 sides the spinoglenoid ligament were observed. Related to the spinoglenoid notch, the mean width was 17.17 +/- 2.17 mm, and the mean depth was 17.45 +/- 2.03 mm in calliper measurements on dry bones, while the mean width was 16.99 +/- 1.88 mm, the mean depth was 17.73 +/- 2 mm and the mean area was 282.04 +/- 55.27 mm2 in computed tomography measurements. Conclusion: The presented data regarding the spinoglenoid notch in which the suprascapular nerve is frequently compressed and the branches of the suprascapular nerve to the infraspinatus muscle may guide the surgical treatment of the related entrapment syndrome.

Aim: To investigate proximal ulna morphometry through a detailed analysis of 107 dry ulnae and to assert its possible clinical relevance. Materials and Methods: A total of 107 (52 left, 55 right) dry ulnae were evaluated. The ulna lengths, olecranon, and trochlear measurements were performed. All measurements were carried on with a 0.01 mm sensitive digital caliper. Results: The mean ulna length and ulna length excluding trochlear notch were 261.17±43.07 mm and, 232.37±43.17 mm, respectively. The mean posterior olecranon height, middle olecranon height, and anterior olecranon height were obtained as 24.05±2.36 mm, 17.80±1.70 mm, and 35.15±3.60 mm, respectively. The mean olecranon width was 23.20±2.79 mm. Moreover, the mean trochlear notch width, radial trochlear notch width, and ulnar trochlear notch width were 22.79±2.81 mm, 24.80±2.69 mm, and 30.14±3.05 mm, respectively. The mean radial trochlear height, ulnar trochlear height were 13.45±2.26 mm and 14.69±2.23 mm, respectively. Lastly, the mean radial notch height, radial notch width, radial notch-olecranon posterior, and radial notch-olecranon anterior were measured as 11.15±1.94 mm, 18.02±2.60 mm, 12.91±2.92 mm, and 30.94±4.62 mm, respectively. Conclusion: The findings of current study may be useful in the application of dorsal plates, intramedullary screw fixation and anatomically pre-shaped plates for the management of proximal ulna fractures.

Standardized reporting around the use of human cadavers or body donors, including the documentation of ethical considerations, has been a subject of recent debate. In this context, this study aimed to investigate changes over time in the reporting of ethical parameters in leading clinical journals representing various disciplines. All articles involving human cadavers and body donors studies published in Clinical Orthopedics and Related Research, Journal of Neurosurgery, and Plastic and Reconstructive Surgery between January 2020 and December 2024 were analyzed. Each article was assessed according to the ethical parameters for human cadavers and body donors, as reported and suggested by prior research. The extent to which the articles provided information on biological characteristics, preservation method(s), source, and ethical/legal permissions was recorded. From the assessed articles, 41.5% of the publications included information on age and sex. The vast majority reported the tissue preservation method (78.5%), while the source of the specimens was omitted in 57% of the articles. Information on informed consent of donors appeared in 24% of the articles, with ethical approval mentioned in 32%. Only 10.5% of the articles acknowledged the cadavers or body donors and their families with gratitude. The results indicate a lack of consistent reporting of ethical parameters. The findings suggest that current publications do not adequately meet previously recommended parameters for reporting research utilizing deceased persons, highlighting the need for clearer journal policies and consistent enforcement to ensure transparency, scientific rigor, and respect for donors.

Objective:The goal of our study is to evaluate and classify the variations of the anterior communicating artery (AComA) on fresh cadavers from the Türkiye population. Methods:In this study, 182 fresh cadavers were analysed and classified according to the number, shape and course of the AcomA. Results:In our study, typical AcomA was the most common with a rate of 86 (47.25%), while variations of the AcomA were found in the remaining 96 (52.75%) cases. Among these variations, in 11.46% (11/96) of cases, AcomA variations were identified as distal and proximal duplications according to the number of branches they represented; 68.75% (66/96) of cases were identified by their shape (X-shaped, single/double fenestration, hypoplasia, or aplasia); and, in 19 cases, it was characterized by course (median artery or oblique course). The rate of variations was 65% (26/40) in females and 49.29% (70/142) in males. In our study, the X-shaped and single fenestration variations were recorded as the most common. Conclusions:The results of the study are important for cerebrovascular surgery and radiological interventions. It emphasises the importance of recognising and considering variations. The study will contribute to the understanding of cerebrovascular diseases and the development of treatment strategies.

PURPOSE:In surgical procedures commonly employed for the management of scaphoid and distal radial fractures, the incision and dissection of the pronator quadratus muscle play a pivotal role. Nevertheless, comprehensive investigations into the anatomical intricacies of the pronator quadratus muscle have been relatively scarce within the clinical community. In light of this, our study endeavors to make a substantive contribution to the medical literature by conducting a meticulous examination of the morphology and morphometry of this muscle. METHODS:This study is a cross-sectional observational study conducted on 22 cadaveric upper extremities (44 sides) preserved between January 2005 and December 2018 at Istanbul University. The study included specimens with intact dissection areas and no prior surgical intervention. Observations focused on the morphometry of the pronator quadratus muscle and related anatomical structures. Statistical analysis was performed using SPSS v23.0, employing Student's t-test and paired t-test, with significance set at p < 0.05. RESULTS:Significant differences were found in the morphometric measurements of the pronator quadratus muscle between the right and left upper extremities, particularly in the vertical distance between the proximal and distal attachment points of the pronator quadratus to the radius (p = 0.008). Additionally, significant differences were observed between male and female samples for radius length (p < 0.001), ulna length (p < 0.001), pronator quadratus width (p < 0.001), and the vertical distance between pronator quadratus attachment points on both the radius (p = 0.001) and ulna (p = 0.001). Furthermore, significant correlations were identified between radius length and parameters such as the vertical distance between pronator quadratus attachment points on both the radius (p = 0.002) and pronator quadratus width (p = 0.030), and between ulna length and parameters including the vertical distances on the radius (p = 0.001) and ulna (p = 0.024). CONCLUSION:In light of our comprehensive analysis, which encompasses not only the anatomical features of the pronator quadratus muscle but also its vascular supply and the organization of its neurovascular structures, we posit that our study holds significant implications for the field of orthopedic surgery. We anticipate that this research will furnish valuable insights that can inform and enhance orthopedic procedures.

BACKGROUND:This study aims to evaluate morphometrically and morphologically the left fibrous ring, mitral leaflets, tendinous cords, and papillary muscles, which are the components of the left atrioventricular valve complex (LAVC), and to reveal their clinical relationships. MATERIALS AND METHODS:A total of 120 human hearts were examined at the Forensic Medicine Institute. The study included cases aged 30 years and older, less than 24 hours post-mortem. Heart length, width, height/width ratio, anteroposterior and mediolateral diameters of the annulus, annular area, length and width of leaflets, number and attachment sites of tendinous cords, number, shape, length, the width of papillary muscles, and distances to various points were recorded to determine their spatial configurations. Additionally, the measurement data of LAVC components in cases with and without cardiovascular disease (CVD) and their relationships with the demographic characteristics of the cases were also explained. RESULTS:In the diagnostic performance test (ROC analysis), it was determined that body mass index ( > 26.7), heart weight ( > 414 g), heart height/width ratio (≤ 1.24), mitral valve width ( > 99.96 mm), left ventricular wall thickness ( > 15.08 mm), annular area ( > 619.37 mm²), and mediolateral diameter of the annulus ( > 30.71 mm) are important diagnostic criteria in determining CVD if they are outside the specified reference values. CONCLUSIONS:This study provides anatomical information about LAVC, along with recommendations for diagnosis and surgical treatment planning. We believe that our findings will be useful to clinicians.

Variations in the branching of the subscapular artery (SSA), anterior circumflex humeral artery (ACHA), and posterior circumflex humeral artery (PCHA) are directly relevant to reconstructive planning with subscapular-system flaps and to humeral-head perfusion in shoulder surgery. Evidence organized around an origin-order–based framework remains limited. We aimed to address this gap by comparing body-donor dissections and computed tomography angiography (CTA) to provide a clinically useful classification and morphometric reference. We performed a two-arm cross-sectional morphometric study: body-donor dissection (28 donors; bilateral, 56 sides) and CTA (25 patients; bilateral, 50 sides). In total, 104 sides were evaluated; 96 were classifiable. Classification used the sequential SSA–ACHA–PCHA origin order and common-trunk presence. Ostial diameters and SSA → CSA distances were measured; the radial nerve (NR)–SSA relationship was assessed in donors. origin_order__five_type_classif… In donors, Type-1, -2, -3, and -4 accounted for 36.5

Objective: The human falx cerebri is an important anatomical structure due to the hemispheres it is adjacent to and the dural venous sinuses it contains. It is also an important landmark in determining the midline in the interhemispheric transcallosal approach for lateral and third ventricular tumours in neurosurgical practises. Thus, the goal of this cadaveric study was to investigate the existence, number, and topography of fenestra on the falx cerebri in the Turkish population. Material and Methods: For this study, 60 adult Turkish cadaveric dura maters were examined. The number of falx cerebris and the existence and topography of fenestra on the falx cerebri was determined. The length and width of the fenestra were measured using a digital compass. Result: All falces cerebrum were single, and no double or triple falx cerebri were observed. There was fenestra on the falx cerebri in 5 cases (8.3% of all cases), and two of them included multiple foramina (%40 of all fenestrae). In addition, one fenestra was on the middle part of the falx cerebri, whereas the other was placed on the posterior part of this partition. The mean length and width of these fenestrae were 23.3x7.5 mm. Conclusion: The novel findings documented in this study may be important to increase the success rate of diagnostic and operative procedures of the falx cerebri or adjacent structures and to minimise intraoperative complications during neurosurgical applications.

The aim of our study was to examine the relationship between uncus and uncal branches of anterior choroidal artery (AChA) and to observe the morphological and morphometric features of these branches. 124 hemispheres from 62 fresh cadavers were included in the study. Measurement of the length of AChA and the distances of the uncal branches to the origin of AChA were measured by ImageJ software. Morphological variations of uncal branches originating from AChA were observed. The length of AChA was found as mean 26.24 ± 4.34 mm. It was determined that the average distance of these uncal branches arising from the AChA was 13.48 ± 7.31 mm. In 4 out of 124 AChAs, no branches were observed. 594 branches originating from 120 were detected. 130/594 branches appeared to be terminal branches. AChAs of 80/120 hemispheres have been reported to have uncal branches. Thirty of 130 uncal branches were observed to originate as the first branch of AChA. It was found that uncal branches may originate from AChA with a variability between 1 and 4. When evaluated according to the origin of each branch from the AChA, it was observed that the uncal branches originated from the midpoint of the AChA on average. Also, in 64 hemispheres, morophological variations were detected regarding the origin of uncal branches. We believe that the morphological and morphometric data we obtained from the uncal branches of the AChA are of clinical importance in terms of understanding this complex region and minimizing errors in surgical procedures.

Background: The zygomaticotemporal foramen (ZTF) is located in the temporal surface of the zygomat-ic bone. The zygomaticotemporal branch, a zygomatic nerve (V2) branch, passes through it and distrib-utes in the forehead and temporal region. The aim of our study was to determine the frequency of ZTF and its connections with other foramina in the zygomatic bone. Materials and Methods: A total of 171 unilateral zygomatic bones in the Department of Anatomy, Faculty of Medicine, Istanbul University were included in our study. The number(s) of ZTF and its relationship with other foramina were determined. The distances between the ZTF and the marginal tubercle and frontozygomatic suture were measured. Results: A total of 328 ZTFs were found in 171 zygomatic bones. In total, 95 of the 328 ZTFs were found to be connected to other foramina through a canal. The vertical distance between the ZTF and the marginal tubercle as well as the frontozygomatic suture were measured as mean 9.26+2.12mm and 21.78+2.48mm, respectively. The transverse distance from the ZTF and the marginal tubercle was measured as 5.46+1.56mm. Conclusions: he ZTF is an important anatomical component with implications for interventions on the zygomatic bone. The incidence and location of the ZTF may differ between individuals and between one side of the same individual. It has provided plastic surgeons and anaesthetists with detailed ana-tomical findings for the protection of the zygomaticotemporal nerves passing through the relevant foramen and thus at risk of injury. Keywords: Zygomaticotemporal foramen, Zygomatic bone, Marginal tubercle, Frontozygomatic suture

BACKGROUND: The posterior cerebral arteries (PCAs) are terminal branches of the basilar artery (BA) and are responsible for the primary supply of the occipital lobe. Saccular aneurysm is most commonly seen close to the bifurcation of the BA. Various surgical interventions are performed for aneurysms. Therefore, the anatomy and localization of the BA and PCA are crucial. The aim of this study was to determine the characteristics of these arteries in a large Anatolian population. METHODS: The study included 170 Anatolian fresh cadavers. The diameters of the BA and PCA were measured. Correlations according to sex and age groups were analyzed. The Q1, Q2, and Q3 angles between the right and left PCA, between the right PCA and BA, and between the left PCA and BA, respectively, were measured. The location of the PCA relative to the sulcus pontocruralis (pontocrural groove) was also evaluated. RESULTS: The diameter of the artery increased with age and was higher in males than in females. Q1 and Q2 diameters were larger in males, while the Q3 diameter was larger in females. The Q1 angle between the right and left PCAs was found to be higher in age range 40 e59 years with a mean of 87.33 +/- 17.91 mm. Finally, the bifurcation point of the PCA was most frequently located above the sulcus pontocruralis (pontocrural groove) and least frequently located on the sulcus pontocruralis (pontocrural groove). CONCLUSIONS: The findings of our study will contribute to the planning of surgical approaches, the development of endovascular devices, the success of invasive procedures, and the reduction of complications.

Objectives: Morphometric information of the structures within the borders of the aortic root is a guide for surgical interventions. It is essential to determine the effects of aortic calcification and atheroma plaque findings on the structures of this region. This study aims to establish the normal values of aortic root structures and to investigate the impact of pathologic findings in order to guide diagnosis and treatment in the clinic. Methods: The aortic root structures were morphometrically analyzed in fresh hearts of 110 patients (89 males, 21 females) brought to the forensic medicine institution. The distances between the bases of the aortic sinuses, their widths and heights, and the lengths of the commissures were measured to differentiate between pathologic and non-pathologic aortic classes. Parameters were compared according to gender, age, body mass index, and body surface area. Results: The mean age was 44.71 +/- 15.57 years in 21 female patients and 53.66 +/- 15.67 years in 89 male patients. The results of the pathologic aorta group with calcification and atheroma plaque findings were higher than the non-pathologic aorta group in all parameters ( P < .05). Conclusions: Calcification and the presence of atheroma plaque in the aorta increase the size of the structures at the aortic root. Gender, age, body mass index, and body surface area are among the criteria that will cause changes in the structures of this region. These results will help surgeons to know the normal values of aortic root structures and to consider the effects of pathologic findings in aortic valve repair operations. (c) 2024 Elsevier Inc. All rights are reserved, including those for text and data mining, AI training, and similar technologies.

Regio temporalis is a site where botulinum neurotoxin is applied for various medical reasons, such as migraine, bruxism, and myofascial pain syndrome. The region is also one of the target regions in flap surgery. This study aimed to define the region topographically. In addition, it was aimed to reveal the intramuscular nerve distribution of the temporalis.11 fixed cephalus (cadaver head) and 2 fresh cephalus were used. The lateral canthus of the eye was marked as point A, and the middle of the ear tragus as point B. The transverse and vertical distances of the branching point of the superficial temporal artery to the A and B points were measured. Transverse distances of the superficial temporal artery and superficial temporal vein to A and B points were measured. The muscle was examined in 5 equal parts (L0–L1–L2–L3–L4), and each part’s vertical muscle and tendon lengths were examined. Intramuscular nerve density was demonstrated by applying the modified Sihler staining to fresh temporalis’. Superficial temporal artery had an average transverse distance of 8.56±1.9 mm in women and 12.56±1.94 mm in men from the middle of the ear tragus. The artery was 64.21±5.59 mm posterior in females and 63.48±6.53 mm in males from the lateral canthus of the eye. Our study determined that the branching point of the superficial temporal artery was below the upper level of the arcus zygomaticus in 10% of cases and above it in 90% of cases. In our study, the L2 point had the highest vertical muscle length at 45.67 mm, while the L3 point had the highest vertical tendon length at 41.25 mm. The point where the muscle length had the highest ratio with 1.49 compared to the tendon length, was the L2 point. The temporalis’ for which the modified Sihler staining was applied was examined in 5 quadrants. It was determined that the nerve densities were in the second and third quadrants from anterior to posterior. The distance of superficial landmarks to neurovascular structures is extremely important in interventions to the regio temporalis. Considering the average distances given in our study is important in avoiding damage in surgical procedures and not injecting into vascular structures. The point where the muscle length had the highest ratio of 1.49 compared to the tendon length was the L2 point. The area in line with this point is the most suitable area for injection. The L2 point is also the most suitable area for injection as it has the highest muscle length. Since the nerve densities were observed in the modified Sihler staining applied temporalis’ 2 and 3 quadrants from anterior to posterior, botulinum neurotoxin injections to these areas will give more effective results.