Anatomia, Volume 5, Issue 1 (March 2026) – 8 articles

Background and objectives: Accurate anatomical knowledge of the transverse dural venous sinuses (TS) is essential for safe neurosurgical procedures, particularly in resource-limited settings where advanced imaging modalities may be unavailable. Despite the TS’s clinical importance, detailed cadaveric studies focusing solely on its morphology are scarce. This study investigated the length, width, and shape of the TS in adult human cadavers, assessing anatomical dominance and morphological variations relevant to surgical planning. Methods: A descriptive, cross-sectional study was conducted on 32 formalin-fixed adult cadavers (20 male, 12 female) at the University of Pretoria in South Africa. The TS was examined bilaterally within the dura mater and the corresponding transverse sulcus. Lengths were measured using a string and a ruler to accommodate curvature, while widths at the origin, midpoint, and termination were measured using digital calipers. Statistical analyses included Shapiro–Wilk tests, paired t-tests, and intra-class correlation to determine significance and reliability. Results: The average TS length was 72.54 mm (left) and 70.23 mm (right), with no statistically significant differences between sides. Right-sided dominance in TS width was observed in 71.88% of cases. A significant narrowing at the midpoint, followed by widening at the termination, was consistently noted, especially in males. Differences between dural and bony groove widths suggested that sulcal impressions may not accurately reflect TS dimensions. Conclusions: The TS demonstrates significant morphological variability, including asymmetry and abrupt dimensional changes. These findings underscore the importance of direct anatomical reference for surgical navigation, particularly in low-resource settings lacking advanced imaging. Full article

Introduction: Understanding superficial epigastric vessel anatomy is crucial for abdominal surgeries like laparoscopy, especially in neonates, to prevent injury. While standard courses are described, variations occur. This case report highlights a unique anatomical variation in the superficial epigastric artery found during the dissection of a stillborn neonatal cadaver. Case Report: In contrast to the usual origin from the femoral artery, this variation features the inferior epigastric artery penetrating the anterior abdominal wall near the umbilicus and branching superiorly to supply the superficial abdominal wall. Conclusions: This distinctive vascular configuration, which to the best of our knowledge has not been previously described in neonatal anatomical literature, diverges from the typical symmetrical arrangement and previously reported variations. The study stresses the clinical importance of this finding, especially for laparoscopic procedures in neonates. During trocar placement, surgeons should be cognizant of such variations to reduce the risk of iatrogenic injuries, including rectus sheath hematoma. The report highlights the need for further investigation to establish the prevalence of this variation and its potential effects on surgical safety and outcomes in a broader neonatal population, which may also reflect the dynamic vascular remodeling that occurs during early developmental stages. Full article

The biceps brachii muscle is a two-headed muscle located in the anterior compartment of the arm. Anatomical variations observed in the biceps brachii muscle are not uncommon. However, very few incidents are reported on a unilateral, rarely described accessory pectoral head in conjunction with the more commonly seen accessory humeral head. This anatomical variation was encountered during routine educational dissection and is the first case of this specific type of four-headed biceps brachii muscle to be described in detail. Variations in the biceps brachii morphology are linked to neurovascular compression, kinematic irregularities and variations in the musculocutaneous nerve. Knowledge of anatomical variations in the biceps brachii muscle is essential for understanding kinematic abnormalities, preventing surgical complications, and diagnosing symptoms of neurovascular compression. Full article

Objectives: The Pulmonary Auscultatory Triangle (PAT) is a bilateral region on the back delimited by the trapezius, latissimus dorsi, and scapula. Beyond its relevance for pulmonary auscultation, PAT also represents an important anatomical window for posterior thoracic approaches. While its anatomy has been extensively described in adults, data on its developmental morphology during fetal life remain scarce. This original morphometric study aimed to characterize the morphometry and morphology of the PAT in human fetuses and to evaluate differences according to sex, side, and gestational age. Methods: A total of 80 PATs from 40 human fetuses (20 male and 20 female) were examined. Using ImageJ software 1.54k, we measured margin lengths (inferior trapezius, medial scapular, and superior latissimus), area, and perimeter. Morphological classification was performed based on internal angles. Associations with sex, side, and gestational age were statistically assessed. Results: The mean gestational age was 28.6 weeks. PAT had a mean area of 103.2 mm² and a mean perimeter of 49.1 mm. Mean margin lengths were 20.1 mm for the trapezius, 12.4 mm for the scapular margin, and 16.6 mm for the latissimus dorsi. Three morphologies were observed: acute (42.5%), obtuse (25.0%), and rectangular (32.5%). A significant asymmetry in shape distribution was found between sides (p = 0.034). Weak but statistically significant positive correlations with gestational age were found for perimeter and for the trapezius and latissimus dorsi margins, indicating progressive enlargement with fetal growth. Conclusions: This study provides the first detailed morphometric and morphological description of the PAT in human fetuses. The findings establish a developmental anatomical baseline for the posterior thoracic wall and highlight growth-related changes and side-related variability. Full article

Anterolateral knee pain is a common complaint that can be debilitating for patients if not treated properly. Lateral Patellar Compression Syndrome (LPCS), characterized by the maltracking of the patella with flexion, placing undue stress on the lateral patellar facet, is a common mechanism causing anterolateral knee pain. Symptoms tend to be exacerbated with deep/prolonged flexion as the lateral patellar facet is compressed on the lateral trochlear groove of the femur. While conservative treatment methods are often sufficient, persistent pain may indicate surgical intervention to correct mechanical malalignment. The surgical treatment of LPCS is not widely agreed upon, with numerous techniques being practiced and no single procedure being considered optimal. This narrative review synthesizes the available literature on surgical techniques for LPCS treatment. A comprehensive search strategy was not employed, limiting the systematic nature of our findings. Full article

What is known today as the triangle of Koch (the triangular locus of the atrioventricular node, TLAVN) is bordered by the fibrous attachment of the septal cusp of tricuspid valve, the opening of the coronary sinus and tendon of valve of inferior vena cava (TIVCV). This is a concept developed cumulatively by several exceptional anatomists. The literature was reviewed with a focus on the discovery of the atrioventricular node by Sunao Tawara (January 1906), its previous announcement by Tawara’s mentor Ludwig Aschoff (1905), and the contributions of the authors who described the other components of the triangular locus. Francesco Todaro discovered the TIVCV (1865); Tawara described the atrioventricular node and its relationship with the fibrous attachment of the septal cusp of tricuspid valve and the opening of the coronary sinus. The first description of assembling all components was provided by Arthur Keith (March 1906). Keith was also the first to consider the triangular locus as a useful landmark for identifying the atrial structures of the conduction system discovered by Tawara and Wilhelm His Jr. (1893). Julius Tandler named the TLAVN as Koch’s triangle (1913). Keith’s contributions to this topic have been particularly overlooked. The “triangular locus of the atrioventricular node” or “triangle of the atrioventricular node” are more instructive and impartial names. Full article

While performing a routine anatomical dissection on a male donor, undergraduate medical students observed an uncommon vascular anomaly: a persistent left superior vena cava (LSVC). Prior to the anatomical dissection, computed tomography (CT) images were obtained in an embalmed condition. Relevant anatomical structures were measured using the JiveX DICOM Viewer. The left brachiocephalic vein (LBV) was present as a communicating vessel with a markedly reduced diameter between the LSVC and the right superior vena cava (RSVC). The diameters of RSVC and LSVC averaged 19.4 mm and 15.2 mm, respectively. The LSVC drained into a dilated coronary sinus (CS), which measured 22.7 mm in diameter. In addition, the left accessory hemiazygos vein collected the 2nd to 5th left intercostal veins, forming a small-caliber venous arch (2.1 mm in diameter) at the T5 vertebral level, which crossed anterior to the thoracic aorta, before draining into the LSVC. In comparison, the azygos venous arch on the right side is connected to the RSVC at T4. Knowledge of such venous variations through preoperative imaging—such as CT, MRI, or echocardiography—can be essential for procedural planning and for minimizing inadvertent complications. This case also highlights a dual approach, combining anatomical dissection with detailed CT analysis of the same specimen, which can both enhance undergraduate anatomical education and contribute to high-quality morphological research. Full article

Background/Objectives: Zenker’s diverticulum (ZD) is a rare but clinically relevant condition. It is a false, pulsion-type diverticulum due to the protrusion of mucosal and submucosal layers through the Killian’s Triangle. Its pathogenesis is multifactorial and entails cricopharyngeus muscle dysfunction and age-related tissue degeneration. This review addresses the current evidence regarding the anatomy, pathophysiology, clinical presentation, diagnostic approach, and therapeutic management of ZD. Methods: For this literature review, we searched the PubMed and Scopus databases using combinations of keywords relevant to Zenker’s diverticulum, including “Zenker’s diverticulum,” “esophageal diverticula,” “diagnosis,” “endoscopic treatment,” and “surgery”. We included articles published in recent decades, with a focus on most recent ones regarding clinical studies, systematic reviews, meta-analyses, and descriptions of new diagnostic and therapeutic techniques. Results: Characteristic symptoms comprise progressive dysphagia, regurgitation of undigested food, halitosis, and, in advanced cases, aspiration-related respiratory complications. Diagnosis of ZD is primarily based on barium swallow esophagography and endoscopic evaluation, complemented by other imaging techniques. Current therapeutic options include traditional open surgery and endoscopic procedures, including newer minimally invasive techniques. Conclusions: ZD is the most common type of esophageal diverticulum and can have a disabling impact on a patient’s quality of life. It is commonly underdiagnosed or misdiagnosed as another condition, and prevalence is expected to increase with the growing population ageing. Improved understanding of its pathophysiology is needed to refine diagnostic and therapeutic strategies and minimize recurrences and risks. Full article