THE ARMS

                                          THE MUSCLES OF THE ARMS
          

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