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Ulnar Nerve

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Description

Borders of the cubital tunnel[1]

General[2]

  • 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.

General 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.

Cubital Tunnel

  • Fibro-osseous space located on the posteromedial aspect of the elbow
  • Transmits ulnar nerve into the forearm
  • Medial wall: medial epicondyle of the humerus
  • Lateral wall: olecranon of the ulna
  • Floor: elbow joint capsule, medial collateral ligament of the elbow
  • Roof: Ligament spanning between the medial epicondyle and olecranon

Functions

Muscular innervations

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


References

  1. Image courtesy of teachmeanatomy.info, "The Ulnar Tunnel"
  2. 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
Authors:
Last edited:
26 November 2023 14:18:33
Category: