The ulnar nerve arises from the C8 and T1 nerve roots and is a major terminal branch of the brachial plexus. It runs down the medial side of the arm and forearm, passing behind the medial epicondyle of the humerus at the elbow. In the forearm, it lies between the flexor digitorum profundus medially and flexor digitorum superficialis laterally. It supplies branches to muscles in the forearm and hand and provides cutaneous innervation to the hypothenar eminence and medial two and a half fingers.

2. INTRODUCTION
Ulnar nerve runs along the medial
side or ulnar side of the fore arm
Ulnar nerve is also called as
Muscian’s nerve
It also controls the fine movements
of the fingers

3. Formation
Ulnar nerve is one of the major
terminal Branches of Brachial
Plexus. It is the continuation of
medial cord of brachial plexus
which arises from the anterior
Division of the lower Trunk.

4. ROOT VALUE
(C8,T1)
The fibers of ulnar nerve arise
from the eight cervical and first
thorasic nerve, so the root value
of ulnar nerve is C8 and T1.

7. AXILLA
The Ulnar nerve lies between the
Axillary artery and vein in the
axilla.

8. ARM
 From the axilla it enters into the arm and lies
medial to the brachial artery.
 It runs downwards along with the brachial artery
up to the level of insertion of coracobrachialis
 At the middle of arm it pierces the intermuscular
septum and enters into the posterior
compartment of arm
 It descends on the back of medial epicondyle of
humerus where it can be palpated

9. FOREARM
 It enters the forearm by passing between two
heads of flexor carpi ulnaris, i.e. cubital tunnel
 The cubital tunnel is a space of the dorsal medial
elbow which allows passage of the ulnar nerve
around the elbow. It is bordered medially by the
medial epicondyle of the humerus, laterally by the
olecranon process of the ulna and the tendinous
arch joining the humeral and ulnar heads of the
flexor carpi ulnaris.

10.  It lies along the lateral border of flexor carpi ulnaris
in the forarm.
 it is accompained by ULNAR ARTERY in the lower two
thirds of forearm.
 In the last phase its course is superficial to the flexor
retinaculum.
 It is covered by superficial slip of the flexor
retinaculum to enter the region of palm.

12. RELATIONS

13. AT THE ELBOW:
 The Ulnar nerve lies behind the medial epicondyle of
the humerus
 It enters the forearm by passing between two
heads of flexor carpi ulnaris

14. IN THE FOREARM:
 The Ulnar nerve runs between flexor digitorum
profundus MEDIALLY and flexor digitorum
superficialis LATERALLY

15. AT THE WRIST
 The ulnar neurovascular bundle lies between the
flexor Carpi ulnaris and the flexor digitorum
superficialis
 The ulnar neurovascular bundle enters the palm by
passing superficial to the flexor retinaculum and
lateral to the pisiform bone

17. MUSCULAR BRANCH:
Muscular branch supplies the
following muscles
The flexor carpi ulnaris
The flexor digitorum
profundus(medial half)

19. PALMAR CUTANEOUS BRANCH:
Palmar cutaneous branch arises in
the middle of the forearm and
supplies the hypothenar
eminence

21. DORSAL CUTANEOUS BRANCH:
Dorsal cutaneous branch arises 7.5
cm above the wrist
It supplies the medial two and half
fingers
It also supplies to the adjoining
area of the dorsum of hand

23. Ulnar nerve supplies to the ELBOW
joint

25. Dr Vidya Sagar