Flexor retinaculum: Difference between revisions

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On either side the retinaculum has a slip.  
On either side the retinaculum has a slip.  
* ''Lateral deep slip'' - It is attached to the medial lip of the groove on the trapezium thus converts it into a fibro-osseous tunnel that transmits the tendon of the flexor carpi radialis and its synovial sheath.
* ''Lateral deep slip'' - It is attached to the medial lip of the groove on the trapezium thus converts it into a fibro-osseous tunnel that transmits the tendon of the flexor carpi radialis and its synovial sheath.
* ''Medial superficial slip'' - It is attached to the pisiform bone and it forms a small canal (of Guyon).  The ulnar vessels and nerves pass deep to this slip. Occasionally Compression of the [[Ulnar Nerve|ulnar nerve]] may occur within this canal. <ref name=":0" /> <ref>R.M.H.McMinn, Last's Anatomy Regional and Applied,Ninth edition</ref>  {{#ev:youtube|J47tdKW3ibg&ab_channel}}
* ''Medial superficial slip'' - It is attached to the pisiform bone and it forms a small canal (of Guyon).  The ulnar vessels and nerves pass deep to this slip. Occasionally Compression of the [[Ulnar Nerve|ulnar nerve]] may occur within this canal. <ref name=":0" /> <ref>R.M.H.McMinn, Last's Anatomy Regional and Applied,Ninth edition</ref>  {{#ev:youtube|J47tdKW3ibg&t}}<ref>Dr. G Bhanu Prakash.The flexor retinaculum of hand. Available from:https://www.youtube.com/watch?v=J47tdKW3ibg&t</ref>


== Function  ==
== Function  ==

Revision as of 08:33, 8 October 2020

Original Editor - Shanshika Maddumage

Top Contributors - Shanshika Maddumage and Leana Louw

Description[edit | edit source]

Flexor retinaculum of hand.png
Flexor retinaculum of hand

Flexor retinaculum is a strong fibrous band which bridges the anterior concavity of the carpal bones thus converts it into a tunnel, the carpal tunnel[1].

Attachments[edit | edit source]

Medially,

Laterally,

These four bony points are all palpable in the living hand and it should be noted that pisiform is the only carpal bone that gives attachments to both flexor and extensor retinacula.

On either side the retinaculum has a slip.

  • Lateral deep slip - It is attached to the medial lip of the groove on the trapezium thus converts it into a fibro-osseous tunnel that transmits the tendon of the flexor carpi radialis and its synovial sheath.
  • Medial superficial slip - It is attached to the pisiform bone and it forms a small canal (of Guyon). The ulnar vessels and nerves pass deep to this slip. Occasionally Compression of the ulnar nerve may occur within this canal. [1] [2]
    EmbedVideo received the bad id "J47tdKW3ibg&t" for the service "youtube".
    [3]

Function[edit | edit source]

Principal function of the flexor retinaculum is to serve as a pulley for the carpal flexor muscles and to stabilize the carpal system [4].

In addition,

  • The volar surface gives rise to muscles of the thenar and hypothenar eminences
  • It is Related to the tendon of the palmaris longus
  • Its Upper margin continues in the palmar carpal ligament and lower margin merges with the palmar aponeurosis

Clinical relevance[edit | edit source]

Carpal tunnel syndrome results when the retinaculum compresses the underlying median nerve[4]

Resources[edit | edit source]

References[edit | edit source]

  1. 1.0 1.1 1.2 B.D Chaurasia.Human Anatomy.Vol.1.Sixth Edition.
  2. R.M.H.McMinn, Last's Anatomy Regional and Applied,Ninth edition
  3. Dr. G Bhanu Prakash.The flexor retinaculum of hand. Available from:https://www.youtube.com/watch?v=J47tdKW3ibg&t
  4. 4.0 4.1 Deak N, Bordoni B. Anatomy, Shoulder and Upper Limb, Wrist Flexor Retinaculum.