Arms Muscles

Arms Muscles

There are three major muscle groups in the arms:

The biceps brachii, a two headed muscle with point of origin under the deltoid and point of insertion below the elbow.

Function : To lift and curl the arm, to pronate (twist downward) the wrist

The triceps brachii, a three-headed muscle that works in opposition to the biceps, also attaching under the deltoid and below the elbow.

Function : To straighten the arm and supinate (twist upward) the wrist

The forearm, involving a variety of muscles on the outside and inside of the lower arm that control the actions of hand and wrist.

Function : The forearm flexor muscles curl the palm down and forward; the forearm extensor muscles curl the knuckles back and up.

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