First State Orthopaedics, Newark, DE, USA.
J Shoulder Elbow Surg. 2010 Jan;19(1):69-72. doi: 10.1016/j.jse.2009.06.008.
There is a paucity of literature examining the origin, size, and capsular contribution of the long head of the triceps brachii muscle. We hypothesize that there is a more extensive origin and capsular contribution than previously described.
Twenty fresh, frozen cadaveric specimens were dissected from a posterior and anterior approach exposing the long head of the triceps and the inferior capsule. The origin and size of the long head of the triceps and contribution to the capsule was documented.
The average age of the specimens was 65.8. At the scapula, the tendon width averaged 2.69cm at the insertion and the thickness averaged 0.47cm laterally and 0.29cm medially. The bony origin extended on the lateral border dorsal surface of the scapula in addition to the infraglenoid tubercle. The long head of the triceps gave a capsular contribution in each specimen. This contribution measured 1.43cm from superior to inferior and 1.01cm from anterior to posterior after dissecting the capsule off the glenoid.
We found the origin of the long head of the triceps had a more extensive bony attachment on the scapula then previously described. In addition, the long head of the triceps has a consistent contribution to the inferior shoulder capsule.
The anatomic origin of the long head of the triceps gives a capsular contribution to the inferior glenohumeral capsule. The triceps may be affected by open and arthroscopic procedures that release or shift the posterior inferior glenohumeral capsule.
Cadaveric study.
目前关于肱三头肌长头的起源、大小和关节囊贡献的文献很少。我们假设其起源和关节囊贡献比之前描述的更为广泛。
通过从后入路和前入路解剖 20 个新鲜冷冻的尸体标本，暴露肱三头肌长头和下关节囊。记录肱三头肌长头的起源、大小及其对关节囊的贡献。
标本的平均年龄为 65.8 岁。在肩胛骨处，肌腱在附着处的平均宽度为 2.69cm，外侧平均厚度为 0.47cm，内侧平均厚度为 0.29cm。骨性起源除了在盂下结节外，还延伸到肩胛骨的外侧缘背侧表面。在每个标本中，肱三头肌长头都对关节囊有一定的贡献。将关节囊从关节盂上剥离后，该贡献从前到后测量为 1.43cm，从上到下测量为 1.01cm。
我们发现肱三头肌长头在肩胛骨上的骨性附着比之前描述的更为广泛。此外，肱三头肌长头对下肩关节囊有一致的贡献。
肱三头肌长头的解剖起源对下盂肱关节囊有一定的关节囊贡献。三头肌可能受到开放和关节镜手术的影响，这些手术会释放或改变下后盂肱关节囊。
尸体研究。
