Origin and Insertion
It arises by a short, thick tendon from the first rib and its cartilage at their junction, in front of the costoclavicular ligament.
The fleshy fibers proceed obliquely superolaterally, to be inserted into the groove on the under surface of the clavicle between the trapezoid ligament and conoid ligaments, which collectively form the coracoclavicular ligament.
Read more about this topic: Subclavius Muscle
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