Abductor pollicis brevis muscle – O& I, Function & Innervation – Anatomy | Kenhub

Abductor pollicis brevis muscle – O& I, Function & Innervation – Anatomy | Kenhub


Hey there! It’s Matt from Kenhub, and in
this tutorial, we will be discussing the abductor pollicis brevis muscle. The thenar musculature
consists of four muscles located on the radial side of the palm. Together, they form the
ball of the thumb known as the thenar eminence. They originate at different carpal bones and
distally attach to the thumb. As mentioned before, the focus of this tutorial will be
the abductor pollicis brevis which is one of the thenar muscles. The abductor pollicis brevis muscle arises
from the tubercles of the scaphoid and, in some cases, the trapezium and form the flexor
retinaculum. The abductor pollicis brevis’ short tendon courses to the base of the proximal
phalanx and the dorsal aponeurosis of the thumb via the radial sesamoid bone. The abductor
pollicis brevis lies quite superficially underneath the skin. The recurrent or thenar branch of the median
nerve is responsible for the innervation of the abductor pollicis brevis. The main function
of each thenar muscle is associated to their names. The abductor pollicis brevis moves
the thumb away from the hand also referred to as abduction at the carpometacarpal joint.
This muscle is also able to perform flexion of the thumb. Since the abductor pollicis
brevis, adductor pollicis, and flexor pollicis brevis attach more distally at the thumb,
they can also perform extension at the interphalangeal joint. This video is more fun than reading a textbook,
right? If you want more videos, interactive quizzes, articles, and an atlas of human anatomy,
click on the “Take me to Kenhub” button. It is time to say goodbye to your old textbooks
and say hello to your new anatomy learning partner, Kenhub! See you there! https://www.kenhub.com

5 Replies to “Abductor pollicis brevis muscle – O& I, Function & Innervation – Anatomy | Kenhub”

  1. How come the thenar muscles can ectend the IP joint if the thumb if they reach only to the proximal phalange and dont cross the ip joint??thanks

  2. Hello there Kenhubbers! Hope you can use your abductor pollicis to give this video a thumbs up! 😀 If you want to learn more about thenar muscles, why not come visit us at our website! We'd love to have you over! https://khub.me/967f1

  3. You said that the abductor pollicus brevis moves the thumb “away” from the hand. That’s not a helpful explanation at all because I don’t know in what direction you’re talking about.

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