Abductor Digiti Minimi (Hand)

Original Editor - Nikhil Benhur Abburi

Top Contributors - Nikhil Benhur Abburi and Kim Jackson

Description[edit | edit source]

Abductor digiti minimi[1]

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

Origin[edit | edit source]

Pisiform and tendon of flexor carpi ulnaris, pisohamate ligament

Insertion[edit | edit source]

Ulnar side of base of proximal phalanx of little finger

Nerve[edit | edit source]

Ulnar nerve (C8, T1)

Artery[edit | edit source]

Ulnar artery

Function[edit | edit source]

Abucts the little finger(5th)

Clinical relevance[edit | edit source]

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

Assessment[edit | edit source]

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[edit | edit source]

  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]