252 



MUSCLES OF THE ABDOMEN. 



series with those of the lower border of the internal oblique muscle. It 

 presents an external and an internal attachment. The external attachment 

 is to Poupart's ligament near its lower part, and there its fibres are continuous 

 with those of the internal oblique muscle ; the internal attachment, smaller 



Fig, 199, Fig. 199. LATERAL VIEW 



OP THE TRUNK, GIVING 



A DEEP VIEW OF THE 



SERRATUS MAGNUS AND 

 TRANSVERSALIS ABDO- 

 JJINIS MUSCLES. ^ 



The serratus magnus is 

 stretched out by the sca- 

 pula being drawn away 

 from the ribs, a, coracoid 

 process of the scapula ; b, 

 glenoid cavity ; c, lower 

 angle ; d, first dorsal ver- 

 tebra ; e, placed on the os 

 pubis, points to the inser- 

 tion of Gimbernat's liga- 

 ment ; I, VI, XII, the first, 

 sixth, and twelfth ribs ; 

 L', first lumbar vertebra ; 

 1, upper portion of the 

 serratus magnus attached 

 to the first and second 

 ribs ; 2, second or middle 

 portion attached to the 

 second and third ribs ; 3, 

 lower or fan- shaped portion 

 attached to the ribs from 

 the fourth to the ninth ; 

 4, the external intercostal 

 muscles ; 5, upper costal 

 origins of the transver- 

 salis abdominis ; 6, origins 

 of the muscle from the 

 transverse processes of the 

 lumbar vertebrae by the 

 lumbar aponeurosis ; 6', 

 part rising from the crest 

 of the ilium ; 7, lower 

 portion rising from the 

 upper half of Poupart's 

 ligament, and passing over 

 the internal inguinal aper- 

 ture ; 8, posterior layer of 

 the sheath of the rectus 

 muscle opened in its upper 

 part by removing the apon- 

 euroses of the oblique mus- 

 cles ; 9, the same in its 

 lower part left entire at the 

 place where the tendons 

 pass entirely in front of the 



rectus muscle ; 10, the interspinales muscles of the lumbar vertebras ; 11, gluteus minimus; 



12, pyriformis. 



and less constant, is by means of a tendinous band to the spine and crest of 

 the pubes, close to the insertion of the internal oblique muscle. The 

 superior fibres of the muscle extend between those attachments in a series 



