- One of the terminal branches of the brachial plexus
- It is a continuation of the medial cord and contains fibres from spinal roots C8 and T1.
- It has motor and sensory supply to the forearm and hand.
- It runs medial to the axillary artery.
- The ulnar nerve penetrates the medial fascial septum to enter the posterior compartment of the arm.
- It runs posterior to the medial humeral epicondyle in the cubital tunnel.
- It enters the hand via the ulnar canal (Guyon’s canal).
- It terminates by giving rise to superficial and deep branches.
- Muscular innervations
- Flexor carpi ulnaris
- Hypothenar muscles
- Flexor digitorum profundus
- Medial two lumbricals
- Adductor pollicis
- Sensory innervations
- Palmar cutaneous branch innervates: the medial half of the palm.
- Dorsal cutaneous branch innervates: the medial side of the dorsum of hand.
- Superficial branch innervates: the anterior aspect of the ulnar 1½ digits (little finger and half of the ring finger).
- ↑ Standring, Susan, and Henry Gray. 2008. Gray's anatomy: the anatomical basis of clinical practice
Alaa Khader on 23 May 2022 21:57:38
24 May 2022 12:17:00