There are three
major muscle groups in the arms:
biceps brachii, a two headed muscle
with point of origin under the deltoid and point of insertion below the
Function : To lift and curl the arm, to
pronate (twist downward) the wrist
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
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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