Background: Mental foramina are located bilaterally in the antero-lateral aspect of the body of mandible. It transmits mental nerve, and vessels. The location, shape, size, direction and number of mental foramen in human mandibles are subject of variation. The knowledge of it is applicable in endodontics, surgery and anesthesia. Aims and Objective: To establish the location, shape, size, direction and incidence of mental foramen (MF) in dry human mandibles of Nepalese population. Materials and Methods: One hundred dry human mandibles of unknown age and sex were selected randomly. Shape, size, position of MF with respect to tooth and other anatomical landmark were determined. Paired t-test was used for specific statistical analysis. Results: In most cases (61%), the MF was oval in shape & situated below the apex of second premolar (58% on right side and 69% on left side). Various parameters investigated were, the horizontal distance between (1) base of mandible and MF was 12.24 mm on right and 12.26 mm on the left, (2) alveolar margin and MF was 13.95 mm on right and13.75 mm on left (3) symphysis menti of mandible and MF was 26.71 mm on right and 26.49 mm on left, (4) posterior border of mandible and MF was 65.34 mm on right and 65.68mm on left. Conclusion: By the knowledge of position, shape, size, direction and distance of the mental foramen from various landmarks and the presence of the accessory foramen may be of much use to dental surgeons.

Background: Portal vein drains blood from the abdominal part of alimentary tract, spleen, pancreas and gall bladder to the liver. It is normally formed by the union of superior mesenteric and splenic veins behind the neck of pancreas. Knowledge of variations regarding the formation of portal vein is very useful for surgeons to perform pancreas and duodenum and liver surgeries and for the interventional radiologist for catheter-based interventions. The objectives of this study are to disclose the variations in formation of hepatic portal vein and to measure the length of portal vein in cadavers. Methods: A descriptive cross sectional study was carried out on 40 embalmed cadavers in the Department of Human Anatomy, KIST Medical College, Lalitpur Nepal after taking ethical approval. The pattern of portal vein formation and its tributaries were identified and photographs were taken. The pattern of portal vein formation was classified as: Type I: Portal vein formed by the confluence of superior mesenteric and splenic vein ; Type II: portal vein formed by the confluence of superior mesenteric, splenic and inferior mesenteric vein . Data was analyzed by using SPSS version 20.Results: Type I pattern of portal vein formation was observed in 31 cadavers (82.5%) while Type II pattern was observed in 5 cadavers (12.5%). Average length of portal vein was 50.58mm. Conclusions: Portal vein shows variations in the pattern of formation which should be taken into consideration during pancreatico-duodenal surgeries and in the interpretation of abdominal angiographs.Keywords: Length; portal vein; variations.

Introduction: Radius is the lateral bone of forearm. Important parameters of its distal end include angle of radial inclination, palmar tilt, and length of radial styloid process. Morphometry of the distal end of radius is important in various clinical orthopaedic procedures such as reduction of distal radius fractures, design of distal radius prosthesis, and kinematics of the wrist joint. The aim of this study is to determine the angle of radial inclination, palmar tilt, length of styloid process, oblique width, transverse and anteroposterior diameter of distal end of human dry radii in Nepalese population. Methods: This is a descriptive cross-sectional study conducted in the dissection hall of Department of Human Anatomy, Nepalese Army Institute of Health Sciences, Sanobhyrang, Kathmandu, Nepal from October 2019 to November 2019 after obtaining ethical approval. Total 76 human dry radii were included in the study by convenience sampling method. Angle of radial inclination, palmar tilt, length of styloid process, oblique width, transverse and anteroposterior diameter of distal end of human dry radii were studied. Data was collected and analysed by SPSS version 24. Results: Mean length of styloid process was 1.09 cm. Mean anteroposterior and transverse diameter of distal end of radius was 1.88 cm and 2.85 cm respectively. Mean oblique width of distal radius was 2.82 cm. The mean palmar tilt and angle of inclination of radius were 9.72 and 23.62 degree respectively. Conclusions: This study provides the reference data for the anatomical alignment while treating the injuries of the distal end of radius in Nepalese population.

Background: Median nerve is generally formed in axilla, as one of the branch of brachial plexus. It is formed by the union of medial and lateral roots which are the branches of me­dial and lateral cord respectively. The knowledge of origin, course and area of distribution of median nerve is important for the anatomist, the neurologist and also for correction of traumatic injuries that are related to brachial plexus. The main objective of this study is to observe different variations in median nerve formation in cadavers. Methods: A descriptive cross-sectional study was conducted in 25 formalin fixed adult human ca­davers in the Department of Anatomy, KIST Medical College and Teaching Hospital, Lalitpur Ethical approval was taken. Altogether, 50 specimens were enrolled in the study by convenient sampling method. The calculation was done using Statistical Package for Social Sciences version 20 (SPSS). Results: In this study the formation of median nerve was observed to be normal in 78% of the cases. In 20% cases three roots were forming the median nerve and in 2% cases four roots were present. Among these variations in 18% cases the additional roots were observed to be given by the lateral cord of the brachial plexus. Conclusions: This study concludes that most of the median nerve forms in axilla by the union of two roots with few variations.

Background: Dried human bones are essential to conduct osteology teaching learning sessions for health professional education, but its scarcity has been felt severely due to lack of simple and easy bone extraction method. Although several methods are practiced; they have their own fallacies. Hence, this study was conducted to explore simple and short method. Methods: A cross-sectional study was conducted in Nepalese Army Institute of Health Sciences (NAIHS) from April 2021 to October 2021 after obtaining ethical clearance from Institutional Review Committee, NAIHS (Reg. No- 424). Formalin fixed cadavers were used to obtain the bones by burial, maceration and chemical methods. In burial method, 600 bones were buried in the ground at 2 feet depth for six months just before monsoon. In maceration method, 200 bones were dipped in a bucket containing cow dung and water and left in the sun for 15 days. In chemical method, 50 bones were treated with washing soda for 19 hours. Remaining soft tissue was scraped, cleaned and bones were dried for 2 to 3 days. Results: Bones obtained by burial method were of good quality without any cracks but few soft tissue and mud was present which had to be cleaned manually. Bones obtained by maceration method was initially black in color. On chemical method, clean bones were obtained with few cracks. Conclusions: Among the above mentioned three methods, maceration method was less time consuming. Chemical method was faster but concentration of chemical should be proper to prevent cracks.