Question

this is a large, fan shaped muscle of the upper chest, a prime mover of shoulder...

this is a large, fan shaped muscle of the upper chest, a prime mover of shoulder flexion?

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Answer #1

Pectoralis Major is a large and fan-shaped muscle which is located within the chest muscle. The muscle inserts into the humerus and it helps in shoulder flexion. It is the muscle which makes most of the chest portion and the primary function for the same is rotation of the humerus and flexion of the shoulder. The muscle arises from anterior surface of clavicle and they perform four types of functions which includes flexion, adduction, medial rotation of the humerus and it also helps in keeping the arm of the body attached to body trunk.

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