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Anatomy
Anatomy

Infraspinatus

Evidence-grounded — sourced from Fysiqal's fitness knowledge graph· 1 min read
rotator-cuffsitsshoulderinfraspinatusexternal-rotation

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In one line

The "I" of SITS; an external rotator of the shoulder also involved in horizontal abduction and extension.

Detail

The infraspinatus is one of the four rotator cuff (SITS) muscles. Its functions are external rotation and involvement in horizontal abduction and extension.

Key facts

  • Function 1: external rotation.
  • Function 2: also involved in horizontal abduction and extension.

Connections

  • rotator-cuff — the SITS group.
  • external-rotation — primary function.
  • horizontal-extension-abduction — also involved.
  • teres-minor — shares the same functions.
SourceReference manual
p.84
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

Atlas Connections

External Rotation
Rotation with the axis of the bone turning away from the body (e.g., the humerus turned outward).
Horizontal Extension (Abduction)
Returning the humerus from the front-horizontal position back to the side-horizontal position.
Rotator Cuff (SITS)Closely related
The four rotator cuff muscles — Supraspinatus, Infraspinatus, Teres minor, Subscapularis (SITS) — that rotate and stabilize the shoulder joint.
Teres MinorClosely related
The "T" of SITS; an external rotator of the shoulder also involved in horizontal abduction and extension.