Muscular branches of ulnar nerve

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Muscular branches of ulnar nerve is present only in forearm and hand.

Forearm muscles :-

Forearm muscles is divided into two compartment, namely; 

1. Flexor compartment.

2. Extensor compartment.

But, ulnar nerve supply only to flexor compartment.

Flexor compartment is again divided into two groups, the first one is superficial and the second one is deep muscles.

Under superficial muscle, ulnar nerve supplies to flexor carpi ulnaris and under deep muscle, ulnar nerve supply only to medial half of flexor digitorum profundus. 

Note - Lateral half of flexor digitorum profundus is supplied by median nerve.

So, for forearm muscles; ulnar supplies to flexor carpi ulnaris and lateral half of flexor digitorum profundus.

Hand muscles :- 

Hand muscles is divided into four groups :-

First group of muscles :-

1. Abductor digiti minimi

2. Flexor digiti minimi

Second group of muscles :- 

1. Lumbrical third

2. Lumbrical fourth

Note - Lumbrical first and second is supplied by median nerve.

Third group of muscles :-

1. Opponens digiti minimi

2. Adductor pollicis

Fourth group of muscles :-

1. Four palmar interossei

2. Four dorsal interossei

One more muscle named PALMARIS BREVIS which is present at the medial side of hand is supplied by ulnar nerve.