This fourth edition is a dynamic presentation of the latest writings regarding the techniques for approaching selected muscles and continues to detail methods of intramuscular electrode placement for the hand, forearm, arm, shoulder girdle, foot, leg, thigh, pelvis, and hip joint. A brief description and diagram are presented for each muscle. Each muscle is also covered with respect to segmental or peripheral innervation, origin, and insertion; position of patient or limb; point of electrode insertion; test maneuver to insure proper location of electrodes; and possible sources of error.