The coracoacromial ligament originates from the summit of the acromion of the scapula, just in front of the articular surface for the clavicle. It inserts by its broad base along the whole length of the lateral border of the coracoid process of the scapula.
The ligament is sometimes described as consisting of two marginal bands and a thinner intervening portion, the two bands being attached respectively to the apex and the base of the coracoid process, and joining together at the acromion.
When the pectoralis minor is inserted, as occasionally is the case, into the capsule of the shoulder-joint instead of into the coracoid process, it passes between these two bands, and the intervening portion of the ligament is then deficient.
Together with the coracoid process and the acromion, the coracoacromial ligament forms a vault for the protection of the head of the humerus.
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