Which muscle, that originates on the acromion process of the scapula and inserts on the proximal end of the humerus, functions to flex the forelimb and rotate it laterally?
A) levator scapulae ventralis
B) clavodeltoid
C) acromiotrapezius
D) latissimus dorsi
E) acromiodeltoid
E
Explanation:
A) The levator scapulae ventralis originates on the occipital bone and atlas, and inserts on the scapula. This muscle, which does not occur in humans, moves the scapula toward the head.
B) The clavodeltoid, also called the clavobrachialis, originates on the clavicle and inserts on the ulna. It functions to flex the forelimb.
C) The acromiotrapezius originates on the spinous processes of the cervical and anterior thoracic vertebrae and inserts on the scapular spine. It holds the scapula in place.
D) The latissimus dorsi originates on the spines of thoracic and lumbar vertebrae, inserts on the medial side of the humerus, and functions to pull the forelimb posteriorly and dorsally.
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