What is the anatomy of the cubital tunnel in ulnar neuropathy?

Updated: Jun 08, 2018
  • Author: Charles F Guardia, III, MD; Chief Editor: Nicholas Lorenzo, MD, MHA, CPE  more...
  • Print

Next, the ulnar nerve passes through the cubital tunnel, which is the space bounded by the following:

  • The medial epicondyle (medial border)

  • The olecranon (lateral border)

  • The elbow capsule at the posterior aspect of the ulnar collateral ligament (floor)

  • The humeroulnar arcade (HUA), or Osborne fascia or ligament (roof)

The deep forearm investing fascia of the flexor carpi ulnaris and the arcuate ligament of Osborne, also known as the cubital tunnel retinaculum, form the roof of the cubital tunnel. The cubital tunnel retinaculum is a 4-mm-wide fibrous band that passes from the medial epicondyle to the tip of the olecranon. Its fibers are oriented perpendicularly to the fibers of the flexor carpi ulnaris aponeurosis, which blends with its distal margin.

The elbow capsule and the posterior and transverse portions of the medial collateral ligament form the floor of the cubital tunnel. The medial epicondyle and olecranon form the walls.

Did this answer your question?
Additional feedback? (Optional)
Thank you for your feedback!