• Source: Mobile wad

The mobile wad (or mobile wad of Henry) is a group of the following three muscles found in the lateral compartment of the forearm:

brachioradialis
extensor carpi radialis brevis
extensor carpi radialis longus
It is also sometimes known as the "wad of three", "lateral compartment", or "radial group" of the forearm.




Function


These three muscles act as flexors at the elbow joint.
The extensor carpi radialis brevis and longus are both weak flexors at the elbow joint. Brevis moves the arm from ulnar abduction to its mid-position and flexes dorsally. Longus is a weak pronator in the flexed arm and a supinator in the outstretched arm. At the carpal joints longus acts in dorsiflexion with the extensor carpi ulnaris and in radial abduction with the flexor carpi radialis. These two muscles are called "fist clenchers" because they must be slightly flexed dorsally during clenching to permit maximal flexion.
Brachoradialis is inserted distally on the radius end therefore, unlike the previous two muscles, only acts on the forearm. It brings the forearm into midposition between supination and pronation, and in this position it acts as a flexor. In slow movements and in the supinated forearm it has a minimal flexor action.




Notes






References


Baek, GH; Kim, JS; Chung, MS (2004). "Isolated ischemic contracture of the mobile wad: a report of two cases". J Hand Surg Br. 29 (5): 508–509. doi:10.1016/j.jhsb.2004.06.007. PMID 15336759.
DuParc, Jacques (2003). Surgical Techniques in Orthopaedics and Traumatology. Elsevier Health Sciences. pp. 55–030–A–10. ISBN 2-84299-414-0.
Platzer, Werner (2004). Color Atlas of Human Anatomy, Vol. 1: Locomotor System (5th ed.). Thieme. ISBN 3-13-533305-1.
Biel, Andrew (2019). Trial Guide to the Body (6th ed.). Books of Discovery. p. 138. ISBN 978-0-9987850-6-6.




External links


Description at orthopaediccare.net
Picture at med.tufts.edu

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