Initial abduction of the shoulder joint is undertaken by which muscle?
Question
Initial abduction of the shoulder joint is undertaken by which muscle?
Solution
The initial abduction of the shoulder joint is undertaken by the Supraspinatus muscle. Here are the steps explaining this:
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The Supraspinatus muscle is one of the four muscles of the rotator cuff, and it is located in the upper part of the shoulder.
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This muscle originates from the supraspinous fossa of the scapula, which is a shallow depression above the spine of the scapula (shoulder blade).
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It inserts into the superior facet of the greater tubercle of the humerus, which is the large, rounded, protruding part of the upper arm bone.
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The main function of the Supraspinatus muscle is to assist in the abduction of the arm (moving it away from the body's midline) and to stabilize the shoulder joint.
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When the arm is at the side of the body, the Supraspinatus muscle is the primary muscle that initiates the abduction of the arm for the first 15 degrees.
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After the first 15 degrees, the Deltoid muscle takes over to continue the abduction of the arm up to 90 degrees.
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Therefore, the initial abduction of the shoulder joint is undertaken by the Supraspinatus muscle.
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