Abductor Digiti Minimi (Hand)

Original Editor - Nikhil Benhur Abburi

Top Contributors - Nikhil Benhur Abburi and Kim Jackson

Description

Abductor digiti minimi[1]

It is a small muscle situated on the ulnar border of the hand forming the hypothenar eminence

Origin

Pisiform and tendon of flexor carpi ulnaris, pisohamate ligament

Insertion

Ulnar side of base of proximal phalanx of little finger

Nerve

Ulnar nerve (C8, T1)

Artery

Ulnar artery

Function

Abucts the little finger(5th)

Clinical relevance

In rare conditions the abductor digiti minimi may have two fascicles[2] passing on ulnar nerve which may cause entrapment[3]

Assessment

Patients forearm in supination, wrist in neutral and instruct the patient to spread his/her fingers. hold them and don't allow to open up

Resources

  1. https://commons.wikimedia.org/wiki/File:Musculus_abductor_digiti_minimi_(Hand).png
  2. J R Sanudo, R M Mirapeix, and B Ferreira. A rare anomaly of abductor digiti minimi. Journal of anatomy 1993 Jun; 182(Pt 3): 439–442.
  3. Horst Claassen,Oliver Schmitt,Marko Schulze &Andrew Wree. Variation in the hypothenar muscles and its impact on ulnar tunnel syndrome Surgical and Radiologic Anatomy volume 35, pages 893–899(2013)
  4. My rehab patient. Abductor digiti minimi control. Available from: https://www.youtube.com/watch?v=15ojdmKkueM [last accessed 31/3/2020]
  5. My rehab patient. Abductor digiti minimi resistance Available from: https://www.youtube.com/watch?v=S0aHLPfcDtY [last accessed 31/3/2020]