PECTORALIS MAJOR. 



205 



hyoid ; 3, upper, 3', lower belly of the orao-hyoid ; 4, levator anguli scapulae ; 4', 4", scalene 

 muscles ; 5, anterior part of the trapezius ; 6, deltoid ; 7, upper part of the triceps brachii 

 in the left arm; 8, teres minor; 9, teres major; 10, latissi>nus dorsi ; 11, pectoralis 

 major ; 11', on the right side its clavicular portion ; 12, part of the pectoralis minor ; 13, 

 serratus raagnus ; 14, external oblique muscle of the abdomen ; 15, placed on the 

 xiphoid cartilage at the upper end of the linea alba ; 15 7 ", is placed on the umbilicus; 16, 

 is placed over the symphysis pubis, and at the lower end of the linea alba, above 16, the 

 pyramidal muscles are seen shining through the abdominal aponeurosis ; 15 to 17, the 

 linea seinilunaris at the outside of the rectus muscle, the transverse tendinous lines of 

 which are seen through the abdominal aponeurosis ; 18, part of the gluteus medius ; 19, 

 tensor vaginje femoris ; 20, rectus femoris; 21, sartorius ; 22, femoral part of the iliacus 

 and psoas ; 23, pectineus ; 24, adductor longus; 25, gracilis. On each side of 16, the 

 external abdominal ring is indicated. 



it is to be observed that the tendon of insertion of the pectoral part 

 of the muscle passes higher than that of the clavicular part, extending as 

 far as the base of the great tuberosity, where it sends a thin prolongation 

 across the bicipital groove, and an offset to the head of the huinerus. The 

 lowest inserted portion of the muscle is closely united with the insertion of 

 the deltoid. From its inferior margin an offset is prolonged to the fascia of 

 the arm. 



The folded inferior border of the pectoralis major forms the anterior margin of the 

 axilla ; the superior runs parallel with that of the deltoid muscle, from which it is sepa- 

 rated only by a slight interval which becomes wider towards the clavicle, and in which 



Fig 173. VIEW OP SOME OP 

 THE DEEPER MtJSOLES OP 

 THE SHOULDER AND TRUNK, 

 FROM BEFORE. 



Fig. 173. 



On the right side the pec- 

 toralis major and external 

 oblique muscles have been re- 

 moved, a, coracoid process of 

 scapula ; b, manubrium of 

 sternum ; e, c, cartilage of 

 the fifth ribs ; d, ensiform 

 portion of the sternum ; 1, 

 upper part of the levator anguli 

 scapulae muscle ; 2, on the 

 middle of the clavide, points 

 to the subclavius muscle; 3, 

 pectoralis minor ; 4, subscapu.- 

 laris; 4 r , its insertion into the 

 lesser tuberosity of the tume- 

 rus ; 5, coraco-brachialis cut 

 fhort; 6, coracoid, and6',glenoid 

 head of the biceps brachii, both 

 cut short near the place where 

 they unite into one muscle ; 7, 

 on the tendon of the lat'ssimus 

 dorsi, points by a line to the ten- 

 don of the teres major, ooth cut 

 short and passing to their inser- 

 tion inside the bicipital groove ; 

 8, folded tendon of the pectoralis 

 major, cut short ; 9, inserted por- 

 tion of the deltoid ; 10, upper 

 part of the bracbiatis anticus at 



its origin, embracing the insertion of the deltoid ; 11, part of the inner head of the triceps, 

 the middle head of which is seen passing behind the tendons of the latissimus and teres ; 

 12, on the fifth and eighth ribs, points to the insertion of the serratus magnus ; 13, 13', 

 recti abdominis. 



