OBJECTIVES Assess the insertional anatomy of the distal aspect of the triceps brachii muscle using magnetic resonance imaging (MRI) in cadavers with histologic correlation and Play-doh® models of the anatomic findings. MATERIALS Elbows were obtained from twelve cadaveric arm specimens by transverse sectioning through the proximal portion of the humerus and the midportion of the radius and ulna. MRI was performed in all elbows. Two of the elbow specimens were then dissected while ten were studied histologically. Subsequently, Play-doh® models of the anatomic findings of the distal attachment sites of the triceps brachii muscle were prepared. RESULTS MRI showed a dual partitioned appearance of the distal attachment sites into the olecranon in all specimens. In the deeper tissue planes, the medial head muscle insertion was clearly identified while superficially, the terminal portion of the long and lateral heads appeared as a conjoined tendon. Histologic analysis, however, showed continuous tissue rather than separate structures attaching to the olecranon. CONCLUSION Although MRI appeared to reveal separate and distinct attachments of the triceps brachii muscle into the olecranon, histologic analysis delineated complex but continuous tissue related to the attachments of the three heads of this muscle. The Play-doh® models were helpful for the comprehension of this complex anatomy and might serve as a valuable educational tool when applied to the analysis of other musculoskeletal regions.

中文翻译：

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肱三头肌的远端插入解剖：使用组织学相关性和解剖发现的Play-doh®模型对尸体标本进行MRI评估。

目的在具有组织学相关性和解剖发现的Play-doh®模型的尸体中，使用磁共振成像（MRI）评估肱三头肌肱骨远端的插入解剖结构。材料肘部是从十二具尸体手臂标本中获得的，横切穿过肱骨的近端部分以及and骨和尺骨的中部。所有肘部均行MRI检查。然后解剖两个肘部标本，同时对十个肘部标本进行组织学研究。随后，准备肱三头肌肱骨远端附着部位解剖发现的Play-doh®模型。结果MRI显示在所有标本中鹰嘴骨远端附着位点呈双重分隔。在更深的组织平面中 可以清楚地识别出头部内侧肌肉的插入，而从表面上看，长头和外侧头的末端部分表现为连贯的肌腱。组织学分析显示，连续的组织而不是附着于鹰嘴的单独结构。结论尽管MRI似乎显示肱三头肌分离到鹰嘴鹰嘴上，但组织学分析显示复杂但连续的组织与该肌肉三头的附着有关。Play-doh®模型有助于理解这种复杂的解剖结构，并且在应用于其他肌肉骨骼区域的分析时可能会成为有价值的教育工具。显示出连续的组织，而不是附着于鹰嘴的单独结构。结论尽管MRI似乎显示肱三头肌分离到鹰嘴鹰嘴上，但组织学分析显示复杂但连续的组织与该肌肉三头的附着有关。Play-doh®模型有助于理解这种复杂的解剖结构，并且在应用于其他肌肉骨骼区域的分析时可能会成为有价值的教育工具。显示出连续的组织，而不是附着于鹰嘴的单独结构。结论尽管MRI似乎显示肱三头肌分离到鹰嘴鹰嘴上，但组织学分析显示复杂但连续的组织与该肌肉三头的附着有关。Play-doh®模型有助于理解这种复杂的解剖结构，并且在应用于其他肌肉骨骼区域的分析时可能会成为有价值的教育工具。