Extensor Digiti Minimi (Quniti)

- See: Forearm Extensors:

- Anatomy:
    - origin: common extensor tendon off lateral epicondyle;
    - insertion: tendon of extensor digitorum at proximal phalanx of little finger & into dorsal expansion of finger extensor tendons;
    - action:
         - extends proximal phalanx of little finger at MP joint & assists wrist extension;
         - extends the middle and distal phalanges especially when proximal phalanx is held in flexion;
    - nerve supply: posterior interosseous branch of deep radial nerve (C6, C7, C8);
    - synergists: extensor digitorum;

- Tunnel V:
    - extensor digiti minimi lies over radioulnar articulation & may be the first tendon to be involved in RA;
    - overlies the distal ends of the radioulnar articulation on the dorsum of wrist, contains extensor digitorum minimi;
    - tunnel is palpable as slight indentation just lateral to the ulnar styloid process;
    - to palpate extensor digiti minimi, have pt rest his palm upon table and raise the little finger;
    - this tendon can move independently;
    - extensor digiti minimi lies over radioulnar articulation & may become involved in RA of the joint;
    - it may be subject to attrition, either from friction due to dorsal dislocation of the ulnar head or from synovitis

Extensor digiti minimi tendon transfer to prevent recurrent ulnar drift.

Original Text by Clifford R. Wheeless, III, MD.

Last updated by Data Trace Staff on Monday, December 12, 2011 4:25 pm