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Pronator quadratus

Other Terms: Musculus pronator quadratus, Muscle carré pronateur

Muscle parts

None

Latin name

Musculus pronator quadratus

Latin muscle parts

None

Group

Antebrachial muscle – anterior compartment – deep group

Etymology

The muscle’s name in English is the square muscle that turns the hand palm downward. The word pronator comes from the Latin pronus, which means “inclined forward or lying face downward.” The word quadratus comes from the Latin quadrus for “square.”

Origin

Oblique ridge on anterior surface of the distal ulna

Insertion

Distal quarter of the radius on the anterolateral surface and into the area just above the ulnar notch of the radius

Action

Major pronator (always active in pronation); stabilizes separation of the radius and ulna when hand is forced into wrist joint

Nerve supply

Median nerve (C7 and C8)

Blood supply

Radial artery; anterior interosseous artery, and small recurrent branches from the deep palmar arch.

Latin

Musculus pronator quadratus

French

Muscle carré pronateur

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