Abductor Pollicis Brevis
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Top Contributors - Anneta Adamou, Saumya Srivastava, Chrysolite Jyothi Kommu and Kim Jackson
Description[edit | edit source]
Abductor pollicis brevis muscle is the most lateral and superficial of the three muscles forming the thenar emirence.
Origin[edit | edit source]
It takes its origin from the front of transverse carpal ligament, extending into the tubercles of scaphoid and trapezium with an occasional contribution from the tendon of abductor pollicis longus.
Insertion[edit | edit source]
The muscle has a short tendon which attaches to the radial side of the base of the proximal phalanx of the thumb.
Nerve[edit | edit source]
Median nerve C8, T1.
Artery[edit | edit source]
Princeps pollicis artery.
Function[edit | edit source]
It acts to abduct the carpometacarpal joint of the thumb.
Clinical relevance[edit | edit source]
- carpal tunel syndrome.
- Median and ulnar nerve lesion.
- Syringomyelia
- Motor neurone disease
- Peripheral neuropathy
