lumbrical

The lateral two lumbrical muscles are the other exception.

For the muscle of the hand, see Lumbrical muscle (hand).

In the hand, the median nerve supplies motor innervation to the 1st and 2nd lumbrical muscles.

There are also lumbrical muscles of the foot that have a similar action, though these are of less clinical concern.

The tendons unite with the interosseous and lumbrical muscles to form the extensorhood mechanism.

Lumbrical muscle (foot)

This caused a contraction of the first lumbrical muscle of the hand and it was this movement that was perceived.

The force of the blow carried the blades between the metacarpal bones, shredding the lumbrical muscles and exiting through the back of the hand.

The lumbrical muscles, attached to the medial side of the lesser toes, act as unopposed adductor, but become insufficient plantar flexors with chronic extension.

It also provides motor innervation to abductor hallucis, flexor hallucis brevis, flexor digitorum brevis, and the first lumbrical.

The medial plantar nerve supplies: the abductor hallucis, the flexor digitorum brevis, the flexor hallucis brevis and the first lumbrical.

It is a fleshy, flat, triangular, and fan-shaped muscle deep in the thenar compartment beneath the long flexor tendons and the lumbrical muscles at the center of the palm.

The lumbrical muscles, with the help of the interosseous muscles, simultaneously flex the metacarpophalangeal joints while extending both interphalangeal joints of the digit on which it inserts.

The intrinsic muscle groups are the thenar and hypothenar muscles (thenar referring to the thumb, hypothenar to the small finger), the dorsal and palmar interossei muscles (between the metacarpal bones) and the lumbrical muscles.

It innervates the flexor carpi ulnaris muscle, the flexor digitorum profundus muscle to the ring and pinky fingers, and the intrinsic muscles of the hand (the interosseous muscle, the lumbrical muscles and the flexor pollicus brevis muscle).

The plantar digital nerves from the medial plantar nerve provide sensory innervation to the skin of the plantar aspect of the toes, except the medial part of the big toe and the lateral part of the little toe and the motor innervation of the first lumbrical.

The lumbrical innervation always follows the innervation pattern of the associated muscle unit of flexor digitorum profundus (i.e. if the muscle units supplying the tendon to the middle finger are innervated by the median nerve, the second lumbrical will also be innervated by the median nerve).