Classic Human Anatomy in Motion by Valerie L. Winslow

Author:Valerie L. Winslow [Winslow, Valerie L.]
Language: eng
Format: epub, pdf
ISBN: 978-0-7704-3415-1
Publisher: Potter/TenSpeed/Harmony
Published: 2015-08-03T16:00:00+00:00

Lower left arm, posterior view, back of hand facing front

Posterior Region, Superficial Muscle Layer (of the Extensor Muscle Group)

The extensor muscle group of the superficial layer of the lower arm includes the extensor carpi radialis longus (ECRL), the extensor carpi radialis brevis (ECRB), the extensor digitorum, the extensor carpi ulnaris (ECU), and a small muscle called the extensor digiti minimi (EDM), all shown in the next drawing. All these muscles except the ECRL begin on the lateral epicondyle of the humerus, sharing a common tendon at this location. The ECRL begins above the lateral epicondyle of the humerus and does not share the common tendon of origin. The individual muscles insert by way of elongated tendons into various bones of the hand on the dorsal side. All four extensor muscles help move the hand at the wrist joint, and the extensor digitorum moves the fingers at the metacarpophalangeal (MCP) joints, proximal interphalangeal (PIP) joints, and the distal interphalangeal (DIP) joints.

EXTENSOR MUSCLE GROUP OF THE LOWER ARM, SUPERFICIAL LAYER

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