The pronator teres is a muscle of the human body (located mainly in the forearm) that, along with the pronator quadratus, serves to pronate the forearm (turning it so the palm faces downward).
The pronator teres has two heads--humeral and ulnar.
The humeral head, the larger and more superficial, arises immediately above the medial epicondyle of the humerus and from the common flexor tendon.
The ulnar head is a thin fasciculus, which arises from the medial side of the coronoid process of the ulna, and joins the preceding at an acute angle.
The median nerve enters the forearm between the two heads of the muscle, and is separated from the ulnar artery by the ulnar head.
The muscle passes obliquely across the forearm, and ends in a flat tendon, which is inserted into a rough impression at the middle of the lateral surface of the body of the radius, just below the insertion of the supinator.
The lateral border of the muscle forms the medial boundary of triangular hollow known as the cubital fossa, which is situated in front of the elbow-joint.
The pronator teres is innervated by the median nerve.
Occasionally, the ulnar head is absent. Also, additional slips from the medial intermuscular septum, from the biceps brachii, and from the brachialis occasionally occur.
"Pronator teres syndrome" is one common cause of wrist pain.
Left humerus. Anterior view.
Bones of left forearm. Anterior aspect.
Cross-section through the middle of the forearm.
The radial and ulnar arteries.
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
de:Musculus pronator teresid:Otot pronator teres
|List of muscles of upper limbs|
|VERTEBRAL COLUMN||trapezius - latissimus dorsi - rhomboid (major, minor) - levator scapulae|
|THORACIC WALLS||pectoralis major - pectoralis minor - subclavius - serratus anterior|
|SHOULDER||deltoid - rotator cuff (supraspinatus, infraspinatus, teres minor, subscapularis) - teres major|
|ARM||anterior compartment: coracobrachialis - biceps brachii - brachialis|
posterior compartment: triceps brachii - anconeus
|FOREARM||anterior compartment: superf. - pronator teres - palmaris longus - flexor carpi radialis - flexor carpi ulnaris - flexor digitorum superficialis
anterior compartment: deep - pronator quadratus - flexor digitorum profundus - flexor pollicis longus
posterior compartment: superf. - mobile wad (brachioradialis, extensor carpi radialis longus and brevis) - extensor digitorum, - extensor digiti minimi - extensor carpi ulnaris
posterior compartment: deep - supinator - anatomical snuff box (abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus) - extensor indicis
|HAND||lateral volar - thenar (opponens pollicis, flexor pollicis brevis, abductor pollicis brevis) - adductor pollicis
medial volar - hypothenar (opponens digiti minimi, flexor digiti minimi brevis, abductor minimi digiti) - palmaris brevis
intermediate - lumbrical - interossei (dorsal, palmar)
he:השריר הכפן העגול
nl:Musculus pronator teressv:Pronator teres