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Pronator teres

Other Terms: Musculus pronator teres, Muscle rond pronateur

Muscle parts

Humeral head; Ulnar head

Latin name

Musculus pronator teres

Latin muscle parts

Caput humerale; Caput ulnare

Group

Antebrachial muscle – anterior compartment – superficial group

Etymology

The muscle’s name in English is the rounded, or cylindrical, 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 teres is Latin for “rounded or cylindrical.”

Origin

Slightly proximal to the medial epicondyle of humerus and from the common flexor tendon (humeral head); medial aspect of the coronoid process of the ulna (ulnar head)

Insertion

Lateral surface of radial shaft near its midpoint

Action

Pronation (it is the weaker of the two pronator muscles, only active during rapid, forcible pronation); weak flexor of elbow joint

Nerve supply

Median nerve (C6 and C7)

Blood supply

From proximal to distal, the muscle receives blood supply from the anterior ulnar recurrent artery, muscular branches from the ulnar artery, and muscular branches from the radial artery near its distal attachment.

Latin

Musculus pronator teres

French

Muscle rond pronateur

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