Supraspinatus

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rotator-cuffsitsshouldersupraspinatusabduction

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DefinitionA short reference note, not a full lesson.

Definition

The "S" of SITS; it abducts the humerus and does not rotate it.

Detail

The supraspinatus is one of the four rotator cuff (SITS) muscles. Its function is to abduct the humerus; it does not rotate the humerus. It is also involved (along with the deltoid heads) in the true abduction movement of the medial deltoid.

Key facts

Function: abducts the humerus; does NOT rotate the humerus.
Participates in true abduction together with the medial deltoid.

Connections

Rotator Cuff (SITS) — the SITS group.
Abduction — the movement it produces.
Medial Deltoid — true abduction involves the supraspinatus.

Sources

Historical reference · reference manual (page cited)

p.84p.380

Cited authorities in source: Ellison (1991).

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Educational content only — not medical advice. Always consult a qualified professional for individualized guidance, especially around injury, pregnancy, or medical conditions.

Explore related topics

Supraspinatus

Abduction Medial Deltoid Rotator Cuff (SITS)

Atlas Connections

Abduction

Movement of a body part away from the midline (axis) of the trunk.

Medial DeltoidClosely related

The middle deltoid head; the primary muscle of true shoulder abduction (90°), involving all three heads plus the supraspinatus.

Rotator Cuff (SITS)Closely related

The four rotator cuff muscles — Supraspinatus, Infraspinatus, Teres minor, Subscapularis (SITS) — that rotate and stabilize the shoulder joint.