Pronator teres muscle

Pronator-teres

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Muscles of forearm.jpg

Muscles of upper limb.(cross section - human cadaver)

Pronator teres

The pronator teres muscle is a muscle located in the forearm. It is one of the muscles of the anterior compartment of the forearm and plays a crucial role in the pronation of the forearm.

Anatomy

The pronator teres muscle has two heads: the humeral head and the ulnar head. The humeral head originates from the medial epicondyle of the humerus, while the ulnar head originates from the coronoid process of the ulna. The muscle inserts onto the lateral surface of the radius.

Innervation

The pronator teres muscle is innervated by the median nerve, which arises from the brachial plexus.

Blood Supply

The blood supply to the pronator teres muscle is provided by the ulnar artery and the radial artery.

Function

The primary function of the pronator teres muscle is the pronation of the forearm, which involves rotating the forearm so that the palm faces downward. Additionally, it assists in the flexion of the elbow.

Clinical Significance

Injury or compression of the median nerve can affect the function of the pronator teres muscle, leading to conditions such as pronator teres syndrome. This condition can cause pain and tenderness in the forearm and weakness in the muscles innervated by the median nerve.

See Also

• Supinator muscle
• Anterior compartment of the forearm
• Median nerve
• Pronation