Martin Ryan M, Vyas Neil M, Sedlmayr Jayc C, Wisco Jonathan J
David Geffen School of Medicine at UCLA, Los Angeles, CA, 90095-1732, USA.
Surg Radiol Anat. 2008 Mar;30(2):171-4. doi: 10.1007/s00276-008-0303-z. Epub 2008 Jan 30.
During routine anatomical dissection, a bilateral variation of the muscle subclavius was discovered with additional morphological features consistent with the muscle subclavius posticus. Attached medially to the first rib by tendon and to the clavicle by fibrous bands, the long triangular shaped muscle ran dorsal-laterally to attach onto the transverse scapular ligament and the coracoid process. The scapular insertion of the omohyoid muscle was just medial to this muscle, with some intermingling of fibers close to their insertions. In addition, the muscle on the left was split into two heads before inserting onto the scapula. Innervation was supplied by the nerve to the subclavius. We believe this muscle to be a hybrid of subclavius and subclavius posticus muscles, and we discuss the developmental origin of this rare subclavius variant, as well as the potential role this muscle may play in the development of thoracic outlet syndrome.
在常规解剖过程中，发现锁骨下肌存在双侧变异，其额外的形态特征与后锁骨下肌一致。这块长三角形肌肉通过肌腱在内侧附着于第一肋，通过纤维带附着于锁骨，向背外侧走行，附着于肩胛横韧带和喙突。肩胛舌骨肌在肩胛骨的附着点恰好在这块肌肉的内侧，在它们的附着点附近有一些纤维交织。此外，左侧的肌肉在插入肩胛骨之前分成了两个头。由支配锁骨下肌的神经提供神经支配。我们认为这块肌肉是锁骨下肌和后锁骨下肌的混合体，并讨论了这种罕见的锁骨下肌变异的发育起源，以及这块肌肉在胸廓出口综合征发生过程中可能发挥的潜在作用。
