The origin of this muscle is the superior 8 or 9 ribs

The origin of this muscle is the medial end of the clavicle and manubrium of the sternum

The origin of this muscle is the inferior border of the rib above.

The insertion of this muscle is the body of the hyoid bone.

The indertion of this muscle is the vertebral border and inferior angle of the scapula.

The insertion of this muscle is the superior border of the rib below.

The action of this muscle is to abduct the scapula and rotate it upwards.

The action of this muscle is to depress the hyoid bone.

The action of this muscle is to elevate the ribs through contraction and depress the ribs through relaxation.

The innervation of this muscle are the thoracic spinal nerves T2-T12.

The innervation of this muscle are the branches of the spinal nerves C1-C3

The innervation of this muscle is the long thoracic nerve.

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