Lumbrical muscles of the Hand - Origin, Insertion & Function - Anatomy | Kenhub

Check out our tutorial on the lumbricals of the hand, a group of intrinsic muscles, which flex the metacarpophalangeal joints and extend the interphalangeal joints. Get more quick facts here: https://khub.me/y3l37

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The lumbrical muscles (lumbricidae - Latin = earthworm) are four short hand muscles located in the metacarpus deep to the palmar fascia. One feature of these muscles is that they originate from tendons instead of bony structures, making their origin surfaces quite moveable.

Usually their origin is found on the radial side of the tendons of the flexor digitorum profundus. In addition, the third and fourth lumbrical muscles have a second head attached to the ulnar side of the adjacent tendon. Distally, their insertion tendons attach to the dorsal aponeurosis of the respective finger.

The first two lumbricals are supplied by the median nerve (C8-Th1), whereas the ulnar nerve (C8-Th1) is responsible for the innervation of the third and fourth.

0:23 Origin & insertion of the lumbrical muscles
0:55 Innervation of the lumbrical muscles
1:10 Functions of the lumbrical muscles

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