Abductor pollicis brevis muscle
Updates to Article Attributes
Body
was changed:
The abductor pollicis brevis is a thin subcutaneous muscle laterally placed in the thenar eminence of the hand.
- origin: mainly from the flexor retinaculum, few fibres origin from the tubercles of scaphoid and trapezium and tendon of abductor pollicis longus. Accessory slips may spring from the long and short pollicial extensors (extensor pollicis longus and extensor pollicis brevis), the opponens pollicis or radial styloid process.
- insertion: its medial fibres are attached by a thin, flat tendon tot he radial side of the proximal phalangeal base in the pollex and lateral fibres join the pollicial dorsal digital expansion.
- innervation: lateral branch of median nerve (C8 and T1)
- action: abducts the thumb and medially rotates it at the carpometacarpal and metacarpophalangeal joints.
-<strong>origin:</strong> mainly from the <a href="/articles/flexor-retinaculum">flexor retinaculum</a>, few fibres origin from the tubercles of <a href="/articles/scaphoid-fracture">scaphoid</a> and <a href="/articles/trapezium">trapezium</a> and tendon of <a href="/articles/abductor-pollicis-longus">abductor pollicis longus</a>. Accessory slips may spring from the long and short pollicial extensors ( <a href="/articles/extensor-pollicis-longus">extensor pollicis longus</a> and <a href="/articles/extensor-carpi-radialis-brevis">extensor pollicis brevis</a>), the <a href="/articles/opponens-pollicis">opponens pollicis</a> or radial styloid process.</li>- +<strong>origin:</strong> mainly from the <a href="/articles/flexor-retinaculum">flexor retinaculum</a>, few fibres origin from the tubercles of <a href="/articles/scaphoid-fracture">scaphoid</a> and <a href="/articles/trapezium">trapezium</a> and tendon of <a href="/articles/abductor-pollicis-longus">abductor pollicis longus</a>. Accessory slips may spring from the long and short pollicial extensors (<a href="/articles/extensor-pollicis-longus">extensor pollicis longus</a> and <a title="Extensor pollicis brevis" href="/articles/extensor-pollicis-brevis-1">extensor pollicis brevis</a>), the <a href="/articles/opponens-pollicis">opponens pollicis</a> or radial styloid process.</li>
-<strong>innervation:</strong> lateral branch of median nerve (C8 and T1)</li>- +<strong>innervation:</strong> lateral branch of <a title="Median nerve" href="/articles/median-nerve">median nerve</a> (C8 and T1)</li>
Unable to process the form. Check for errors and try again.