UE needle landmarks

Question 1

Abductor digit minimi

Answer 1

Insert electrode to a depth of 1/4 to 1/2 inch at the midpoint of a line drawn between the ulnar aspects of the fifth metacarpophalangeal joint (MP-5) and the ulnar aspect of the pisiform (P).

Pitfalls If the electrode is inserted too deeply it will be in the opponens digiti minimi.

Involved in most ulnar nerve lesions except in Guyon tunnel entrapment when innervated through superficial palmar branch

Function: to abduct the 5th digit to approximately a 45-degree angle.