Extensor Carpi Radialis Longus is, as the name suggests, the longer of the two extensor carpi radialis muscles as its origin is the ridge above the lateral epicondyle of the humerus, as opposed to the medial epicondyle.

Origin

  • Lateral supracondylar ridge of the humerus

Insertion

  • Base of the 2nd metacarpal (dorsal side)

Actions

  • Extension of the wrist
  • Radial deviation (abduction) of the wrist

Innervation

  • Radial nerve

Daily uses

  • Typing

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Extensor Carpi Ulnaris

The Extensor Carpi Ulnaris muscle is a powerful wrist extensor and except for the flexor carpi ulnaris is the only muscle involved in wrist adduction.

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