Tubbs R Shane, Shoja Mohammadali M, Shokouhi Ghaffar, Loukas Marios, Oakes W Jerry
Department of Cell Biology, University of Alabama at Birmingham, USA.
Anat Sci Int. 2008 Dec;83(4):291-3. doi: 10.1111/j.1447-073X.2007.00214.x.
The pectoralis major muscle is subject to various morphologies. One presumably very rare variation is insertion of this muscle into the shoulder joint. During the routine dissection of the right upper extremity of an adult male cadaver a distinct separate tendinous insertion into the shoulder joint capsule was identified. This vertical tendon (7 mm x 6 cm) traveled just lateral to the long head of the biceps brachii muscle and terminated into the fibrous aspect of the joint capsule without penetrating it. Mechanical traction on the humeral attachment of the pectoralis major resulted in anteroinferior displacement of the shoulder joint capsule. The possible embryologic origin of this variation is discussed. Clinicians may wish to consider potential attachment of the pectoralis major into the capsule of the shoulder joint in diagnosing pathology of this region.
胸大肌有多种形态。一种可能非常罕见的变异是该肌肉插入肩关节。在对一名成年男性尸体的右上肢进行常规解剖时，发现了一条明显的独立腱性结构插入肩关节囊。这条垂直的肌腱（7毫米×6厘米）走行于肱二头肌长头的外侧，止于关节囊的纤维部分，未穿透关节囊。对胸大肌肱骨附着点施加机械牵引力会导致肩关节囊向前下移位。本文讨论了这种变异可能的胚胎学起源。临床医生在诊断该区域的病变时，可能需要考虑胸大肌潜在附着于肩关节囊的情况。
