FLEXOR DIGITORUM PROFUNDUS:

The muscle derives from the medial surface of the olecranon process. The point of origin is from the medial surface of the olecranon process. It is a very sharp edge that is derived, that attaches to the olecranon fossa of the humerus. At the point of insertion the muscle comes from the olecranon process of the ulna, passes inside and enters the retinaculum, it is called extensor retinaculum because it has enters the extensor parts palm. The fibres now extend and terminates near different.

Nerve Supply

It receives two nerves supply because of the bifurcation. One of the nerves that bifurcates is supply by two nerves:

* Ulna nerve

* Medial nerve

* The ulnar nerve supplies the superior portion of the muscle.

* While the medial nerve supplies the inferior portion of the muscle to the digit to generate impulses.

FLEXOR POLLICIS LONGUS and PRONATOR QUADRATUS MUSCLES:

FLEXOR POLLICIS LONGUS

Origin:

It originates from the anterior surface of the radial bone between the area of attachment between the origin of the pronator teres and the origin of the pronator quadratus.

Insertion:

It also passes through or behind the flexor retinaculum and extends and inserts at the distal phalanges to insert because there is no bifurcation.

Nerve Supply:

* It is supplied by the median nerve.

Actions:

* It flexes the Distal inter-phalangeal joints.

THE PRONATOR QUADRATUS MUSCLES

Origin:

It arises from the Distal one-fourth or one quarter of the antero-lateral portion within the Pronator Ridge.

Insertion:

It inserts into the distal one quarter of the radial bone, as it decussates it now inserts at the anterior margin of the radial bone with the interosseous membrane.

Nerve Supply:

Median nerve

ACTION

It is the principal pronator of the forearm.