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Hello there! It’s Matt from Kenhub, and
in this tutorial, we will be discussing the flexor pollicis brevis. 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. This tutorial will explore the origin, insertion, innervation
and function of the flexor pollicis brevis, one of the thenar muscles. The flexor pollicis brevis muscle has two
heads separated by the tendon of the flexor pollicis longus. The superficial head originates
from the flexor retinaculum and the deep head from both the capitate and trapezium bones.
The tendon runs to and inserts at the base of the proximal phalanx of the thumb via the
radial sesamoid bone. The flexor pollicis brevis is the only thenar
muscle receiving double innervation due to its transformation during the course of embryogenesis.
Most frequently, the median nerve supplies the superficial head and, the ulnar nerve,
the deep head. However, the innervation pattern is quite variable due to the fact that most
people have an interconnection between the recurrent branch of the median nerve and the
deep branch of the ulnar nerve at the ball of the thumb. The main function of each thenar muscle is
associated to their names. The flexor pollicis brevis is mainly responsible for bending the
thumb, or flexion, at the carpometacarpal joint as well as adduction of the thumb. 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!

One thought on “Flexor Pollicis Brevis Muscle – Origins & Function – Human Anatomy | Kenhub

  1. Hi everyone! We hope you enjoyed watching our short video on the flexor pollicis brevis muscle. Please let us know what you would like us to cover on the next videos. You can test your knowledge about the thenar muscles (origin, insertion, innervation, function) with our quiz: Good luck!

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