Piyawinijwong Sitha, Sirisathira Nopparatn
Department of Anatomy, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand.
J Med Assoc Thai. 2010 Sep;93(9):1065-9.
To demonstrate and classify the variation of the subclavius muscle according to its insertion in the Thais.
One hundred and twenty eight upper limbs were dissected out to expose the scapular region. The attachments of subclavius muscles were examined and recorded.
The subclavius muscle was categorized into 4 types according to its insertion. There are 64.06% of type I, 17.96% of type II, 15.62% of type III and 2.34% of type IV. The insertion of subclavius muscle is gradually extended from the shallow groove on the inferior surface of the clavicle towards the conoid ligament and corocoid process, to the superior transverse scapular ligament and to the superior border of the scapula adjacent to the insertion of inferior belly of omohyoid muscle.
The present study prevailed 64% normal subclavius muscle and other 36% of varied supernumerary subclavius muscle. The presence of supernumerary subclavius muscle could be a predisposing causative factor of thoracic outlet syndrome.
根据锁骨下肌在泰国人群中的附着情况，对其变异进行展示和分类。
解剖128例上肢以暴露肩胛区。检查并记录锁骨下肌的附着情况。
根据其附着情况，锁骨下肌分为4种类型。I型占64.06%，II型占17.96%，III型占15.62%，IV型占2.34%。锁骨下肌的附着点从锁骨下表面的浅沟逐渐延伸至锥状韧带和喙突，再到肩胛上横韧带以及肩胛上缘靠近肩胛舌骨肌下腹附着处。
本研究显示64%为正常锁骨下肌，其余36%为变异的额外锁骨下肌。额外锁骨下肌的存在可能是胸廓出口综合征的一个易感致病因素。
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