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Ulnar Nerve

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  • General[1]
    • 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.
  • Course
    • 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).

Clinical Significance

See Also


  1. Standring, Susan, and Henry Gray. 2008. Gray's anatomy: the anatomical basis of clinical practice
Created by:
Alaa Khader on 23 May 2022 21:57:38
Last edited:
24 May 2022 12:17:00