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Humeral head of pronator teres
Other Terms:
Caput humerale (Musculus pronator teres),
Caput humerale musculus pronatoris teretis
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
Caput humerale musculus pronatoris teretis
