Coracoacromial

Its apex, which corresponds to the point of meeting of these two borders in front, is thin, and has attached to it the coracoacromial ligament. ❋ Unknown (1918)

It is thick medially, but thinner laterally under the coracoacromial ligament. ❋ Unknown (1918)

The joint is protected above by an arch, formed by the coracoid process, the acromion, and the coracoacromial ligament. ❋ Unknown (1918)

The great width of the central portion of the humeral head also allows of very free horizontal movement when the arm is raised to a right angle, in which movement the arch formed by the acromion, the coracoid process and the coracoacromial ligament, constitutes a sort of supplemental articular cavity for the head of the bone. ❋ Unknown (1918)

The horizontal portion is flattened from above downward; its upper surface is convex and irregular, and gives attachment to the Pectoralis minor; its under surface is smooth; its medial and lateral borders are rough; the former gives attachment to the Pectoralis minor and the latter to the coracoacromial ligament; the apex is embraced by the conjoined tendon of origin of the Coracobrachialis and short head of the Biceps brachii and gives attachment to the coracoclavicular fascia. ❋ Unknown (1918)