Origin: Ulnar Head- coronoid process

                Humeral Head-  Medial epicondyle via common flexor tendon.

Insertion: Middle of convexity of lateral surface of radius

Action: Pronation ( when more speed and power is needed) and flexion of forearm at elbow 

Inervation: Median n. (C6, C7)

Flexor Carpi Radialis

(FCR)

Origin: Medial epicondyle via common flexor tendon.

Insertion: Base of 2nd metacarpal.

Action: Flexion and radial deviation of the hand ( when acting alone); forearm flexion.

Inervation: Median n. (C6, C7)

Origin: Medial epicondyle via common flexor tendon.

Insertion: Distal 1/2 of flexor retinaculum and apex of palmar aponeurosis.

Action: Flexion of hand at wrist and tenses palmar aponeurosis.

Inervation: Median n. (C7, C8)

Flexor Carpi Ulnaris

(FCU)

Origin: Humeral head- Medial epicondyle via common flexor tendon.

                Ulnar head- Olecranon and post. border via aponeurosis.

Insertion: Pisiform, hook of hamate and 5th metacarpal.

Action: Flexion and ulnar deviation of the hand (when acting alone); forearm flexion.

Inervation: Ulnar n. (C7, C8).

Blood Supply: Ulnar a.

Flexor Digitorum Superficialis

 (FDS)

(Intermediate Layer)

Origin: Humeral head- Med. epicondyle via common flexor tendon and coronoid process.

               Radial head- Superior 1/2 ant. border.

Insertion: Shafts of middle phalanges of medial 4 digits via split tendon.

Action: Flexion of PIPs; strong flexion of MCPs.

Inervation: Median n. (C7, C8, T1)

Blood Supply: Ulnar and radial arteries.