[X]
01
Click on the structure to specify the target of your label
01
  • labels

Extensor pollicis brevis

Other Terms: Musculus extensor pollicis brevis, Muscle court extenseur du pouce

Muscle parts

None

Latin name

Musculus extensor pollicis brevis

Latin muscle parts

None

Group

Antebrachial muscle – posterior compartment – radial group

Etymology

In English this muscle’s name is the short muscle that straightens the thumb. The word extensor comes from the Latin ex meaning “out from” and tendere meaning “to stretch.” The Latin pollex meaning “thumb” arises from the Latin polleo meaning “to be strong,” as the thumb was the strongest of the fingers. Brevis is the Latin term meaning “short.” This is being used as a comparative reference to a longer muscle that does the same thing.

Origin

Posterior surface of the radius distal to the abductor pollicis and the adjacent interosseous membrane

Insertion

Dorsolateral surface on the base of the proximal phalanx of the thumb

Action

Extends the metacarpal bone and proximal phalanx of the thumb

Nerve supply

Radial nerve (C7 and C8)

Blood supply

From proximal to distal, the muscle belly receives blood from the posterior interosseous artery and perforating branches from the anterior interosseous artery. The distal tendon receives blood from the a branch of the radial artery in the anatomical snuff box, the dorsal metacarpal artery, and small branches from the dorsal carpal arch.

Latin

Musculus extensor pollicis brevis

French

Muscle court extenseur du pouce

Comments

Related Images

View All