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Muscles of Hand (Left)
Muscular System

Muscles of Hand (Left)

Musculi manus

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Description

The hand is composed of both intrinsic and extrinsic muscles.

- The extrinsic muscles of the hand are the long flexor and extensors that originate in the arm or forearm.

- The intrinsic muscles of the hand are a group of muscles that originate and insert into structures within the hand itself.

The intrinsic muscles of the hand are involved in fine motor movements and allow for great dexterity of the hand.

For classification purposes, the intrinsic muscles of the hand are divided into five distinct groups:

- thenar muscles;

- adductor pollicis muscle;

- hypothenar muscles;

- interossei muscles of hand;

- lumbrical muscles of hand.

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39,40 The lumbricals are a group of intrinsic hand muscles that originate on the flexor digitorum profundus (FDP) tendons.

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