Deltoid Posterior Head

The deltoid is a large, thick, triangular muscle of the shoulder girdle (pectoral girdle) that assists in movements of the shoulder and arm. It consists of three heads: the anterior, or clavicular, head covers the front of the shoulder; the middle, or acromial, head covers the lateral part of the shoulder; and the posterior, or spinal, head covers the back of the shoulder. When these three heads contract together, they abduct the arm.

Deltoid Posterior Head

Body Part(s):

Muscle Group(s):

This muscle is responsible or assists with the following joint movement(s):

Exercises that involve this muscle:

Action: Shoulder Horizontal Abduction
Action: Shoulder Lateral Rotation
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