Extensor Carpi Radialis Brevis Anatomy

Extensor Carpi Radialis Brevis Muscle

Origin:  Lateral epicondyle of the humerus
Insertion:  Dorsal surface of the base of the third metacarpal
Actions: Extension of the wrist
Innervation: Radial nerve (C6, C7)
Blood Supply: Radial recurrent artery from the radial artery

Primary Actions of the Extensor Carpi Radialis Brevis

1. Extension of the wrist
Agonists:

  • Extensor Carpi Radialis Brevis
  • Extensor Carpi Ulnaris

Antagonists:

  • Flexor Carpi Radialis
  • Palmaris Longus
  • Flexor Carpi Ulnaris

Extensor digitorum, extensor digiti minimi, and extensor pollicis longus assist with extension of the wrist.

2. Radial Deviation of the wrist
Agonists:

  • Extensor Carpi Radialis Longus
  • Flexor Carpi Radialis

Antagonists:

  • Flexor Carpi Ulnaris
  • Extensor Carpi Ulnaris

Extensor pollicis brevis and abductor pollicis longus assist with radial deviation of the wrist

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