Question

In: Anatomy and Physiology

List the muscle(s) that pronate the forearm.

Expert Solution

PRONATION :-

Rotation of the hand and forearm so that the palm faces backward or downwards.

MUSCLES THAT INVOLVES IN FOREARM PRONATION :-

Pronator teres
Pronator quadratus

PRONATOR TERES :-

Origin :-

Humeral head :- From the medial epicondyle of the humerus

Ulnar head :- From the medial border of the coronoid process.

Insertion :- Into the rough impression on the middle part of the lateral surface of the shaft of radius .

Nerve supply :- From the median nerve.

Action :- 1. Pronation of the forearm at the radio-ulnar joints .

2. Flexion of the forearm at the elbow joint.

PRONATOR QUADRATUS :-

Origin :- From the lower 1/4 of the anterior surface of the shaft of the ulna .

Insertion :- Into the lower 1/4 of the anterior surface of the shaft of the radius .

Nerve supply :- From the anterior interosseus nerve ( branch of the median nerve ).

Action :- Pronation of the forearm at the radio-ulnar joints .

Sydney Mullin answered 1 year ago

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