侧颅底应用解剖学研究

目的：通过对侧颅底解剖学结构的观察与测量,为临床侧颅底手术的定位、导航提供解剖学依据。方法10％甲醛浸泡的成人尸头10个（20侧）,观测颈静脉球区域神经血管、颈内动脉毗邻的解剖关系。结果颈静脉球,其形态可分为隆起型和低平型,舌咽神经多位于颈静脉球前内侧者,迷走神经和副神经多位于颈静脉球内侧者,颈内动脉岩骨段距离鼓膜张肌的长度平均为2．2mm,距离下颌神经和脑膜中动脉的平均长度分别为6．9mm和6．8mm。结论侧颅底血管和神经分布密集,术者了解侧颅底血管和神经的解剖关系,有利于手术中安全扩大手术视野,避免术中损伤血管、神经。     

PBL与LBL相结合教学法在人体解剖学教学中的运用

目的探讨PBL与LBL相结合教学法在人体解剖学教学中的教学效果。方法将本校2013级美容班156人随机均分成LBL组、PBL组和PBL＋LBL组3组,采用教师评教和考试测评进行教学效果评估。结果 PBL教学法与LBL教学法具有很强的互补性,二者结合,能取得较为满意的教学效果。结论 PBL与LBL相结合教学法不仅增强了学生对课本内容的记忆,而且使学生能将所学知识灵活运用到临床病例分析中,提高了学生的综合素质。     

The cadaveric anatomy of the distal radius: implications for the use of volar plates

INTRODUCTION

Fractures of the distal radius are common upper limb injuries, representing a substantial proportion of the trauma workload in orthopaedic units. With ever increasing advancements in implant technology, operative intervention is becoming more frequent. As growing numbers of surgeons are performing operative fixation of distal radial fractures, an accurate understanding of the relevant surgical anatomy is paramount. The flexor carpi radialis (FCR) tendon forms the cornerstone of the Henry approach to the volar cortex of the distal radius. A number of key neurovascular structures around the wrist are potentially at risk during this approach, especially when the FCR is mobilised and placed under retractors.

METHODS

In order to clarify the safe margins of the FCR approach, ten fresh frozen human cadaver limbs were dissected. The location of the radial artery, the median nerve, the palmar cutaneous branch of the median nerve and the superficial branch nerve were measured with respect to the FCR tendon. Measurements were taken on a centre-to-centre basis in the coronal plane at the watershed level. In addition, the distances between the tendons of brachioradialis, abductor pollicis longus and flexor pollicis longus, and the radial artery and median nerve were measured to create a complete picture of the anatomy of the FCR approach to the distal radius.

RESULTS

The structure most at risk was the palmar cutaneous branch of the median nerve. It was located on average 3.4mm from the FCR tendon. The radial artery and the main trunk of the median nerve were located 7.8mm and 8.9mm from the tendon. The superficial branch of the radial nerve was 24.4mm from the FCR tendon and 11.1mm from the brachioradialis tendon.

CONCLUSIONS

Operative intervention is not without complication. We believe a more accurate understanding of the surgical anatomy is key to the prevention of neurovascular damage arising from the surgical management of distal radial fractures.     

Anatomy of the Coronary Sinus and Epicardial Coronary Venous System in 620 Hearts: An Electrophysiology Perspective

Anatomy of the Coronary Venous System . Introduction: Cannulation of the coronary sinus (CS) is a prerequisite for left ventricular (LV) pacing and certain ablation procedures. The detailed regional anatomy for the coronary veins and potential anatomic causes for difficulty with these procedures has not been established. Methods and Results: Therefore, we performed macroscopic measurements in 620 autopsied hearts (mean age 60 ± 23 years, 44% female). The CS was preserved for analysis in 96%. Sixty‐three percent had a Thebesian valve that covered the posterior aspect of the CS ostium with extension to the superior (50%) and inferior aspects (18%) and was obstructive with fenestrations in 3 specimens. Partial or near occlusive valves were present occasionally at the ostium of the great cardiac vein (Vieussens; 8%) and middle cardiac vein (5%). Ninety‐three percent had left atrial branches, and 41% had at least one branch with lumen > 3 French. For CRT lead placement, the mid‐lateral LV was accessible from the middle cardiac vein (20%), the left posterior vein (92%) or the anterior interventricular vein (86%). Among specimens where the left phrenic nerve was preserved it crossed the LV mid‐lateral wall in 45%. Conclusions: Epicardial coronary vein anatomy is variable, and the mid‐lateral LV wall can potentially be accessed through various tributaries of the epicardial veins. The orientation of the Thebesian valve favors cannulation of the CS from an anterior (ventricular) and inferior approach. Anterobasal, mid‐lateral, and inferior apical LV coronary veins lie in proximity to the course of the phrenic nerve. (J Cardiovasc Electrophysiol, Vol. 24, pp. 1‐6, January 2013)     

A three-dimensional finite element model of human atrial anatomy: New methods for cubic Hermite meshes with extraordinary vertices

High-order cubic Hermite finite elements have been valuable in modeling cardiac geometry, fiber orientations, biomechanics, and electrophysiology, but their use in solving three-dimensional problems has been limited to ventricular models with simple topologies. Here, we utilized a subdivision surface scheme and derived a generalization of the “local-to-global” derivative mapping scheme of cubic Hermite finite elements to construct bicubic and tricubic Hermite models of the human atria with extraordinary vertices from computed tomography images of a patient with atrial fibrillation. To an accuracy of 0.6 mm, we were able to capture the left atrial geometry with only 142 bicubic Hermite finite elements, and the right atrial geometry with only 90. The left and right atrial bicubic Hermite meshes were G1 continuous everywhere except in the one-neighborhood of extraordinary vertices, where the mean dot products of normals at adjacent elements were 0.928 and 0.925. We also constructed two biatrial tricubic Hermite models and defined fiber orientation fields in agreement with diagrammatic data from the literature using only 42 angle parameters. The meshes all have good quality metrics, uniform element sizes, and elements with aspect ratios near unity, and are shared with the public. These new methods will allow for more compact and efficient patient-specific models of human atrial and whole heart physiology.     

Performance of medical students in case-based and essay components of written anatomy examinations

This paper reports on second-year medical students' performance in the case-based and traditional essay components of the gross anatomy written examinations at the University of Otago held at the end of 1988 and 1989. The mean marks for these two components of the examinations are presented for the three main categories of student entry. Differential performance on the case-based component relative to the essay component has been determined for each student in the class and ranked in order. The proportions of students in the three entry categories falling in the various quartiles for the class are given. The data show that when an intensive programme of case-based learning was followed, as in 1988, all three categories performed similarly on the case-based component relative to the essay component. When a less intensive programme of case-based learning was used, as in 1989, the differential performance of the preferential undergraduate and graduate categories was different to each other. The findings suggest that the achievement of students in the case-based projects is dependent upon the organization of the programme and the extent to which students and staff become involved in the projects. The writing of reports on the cases by students for assessment in 1988 may have had an important influence on the outcome for this year.