Hand muscles


The muscle structure of the hand is intentionally complex and intimate considering the vast variations of movements and the remarkable fine motor movements that the hand is responsible for initiating and completing. The flexion and extension as it relates to the fingers and the hand are taken care of by the muscles describe din the previous segment.


The small intrinsic muscles of the fingers and the hand are those which allow for the more intricate and detailed movements that require more than mere flexion and extension. Abduction and adduction and precise control enable the hand to perform these intricate and detail oriented tasks.

Hand muscles are segregated into three basic categories; thenar, hypothenar, and intermediate.

The base of the thumb that appears additionally fleshy and larger than the rest of the hand is created by three individual muscles known collectively as the thenar eminence. The opponens pollicis, the abductor polis brevis, and the flexor polis brevis each make up the collective base of the thenar eminence. The opponens pollicis is considered to be the most vital out of this group for its aoppositional effect on the thumb to the palm of the hand.


Muscles of the Hand
Image: Muscles Of The Hand

At the base of the little finger there is an additional fleshy bulge that creates and elongated pad down the side of the palm. This is known as the hypothenar eminence and is also created by the merging of three separate muscles. The opponens digiti minimi, the abductor digiti minimi, and the flexor digiti minimi all converge to create thie hypothenar eminence.

The muscles which belong to the intermediate group exist more or less between these two fleshy bulges in the region of the palm of the hand. They can be pinpointed in between the metacarpal bones in the palm. The intermediate group of muscles is made up of the lumbricales, the adductor pollicis, the palmar interossei, and the dorsal interossei muscles.
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