EECTUS ABDOMINIS MUSCLE. 



321 



When one or two additional transverse lines occur, they are usually 

 incomplete ; one of them is very generally placed below the umbilicus, the 



Fig. 226. 



Fig. 226.— Deep JIuscles 

 OP the forepart op 

 THE Trunk and Shoul- 

 der. (A. T.) i 



For the explanation of 

 the ret'erences in the upper 

 part of the figure see p. 195. 

 c, c, cartilages of the fifth 

 ribs ; d, ensiform portion 

 of tlie sternum ; e, sym- 

 phy.sis pubis ; /, anterior 

 superior iliac spine ; 1"J, 

 insertion of the serratus 

 magnus on the ribs ; 13, on 

 the right side, the rectus 

 abdominis ; on the left 

 side 13', 13', the divided 

 ends of the same muscle, 

 a portion being i-emoved ; 

 14, points to the pyrami- 

 dalis muscle exposed on 

 the left side ; 15, on 

 the right side, the internal 

 oblique muscle ; 15', origin 

 of its lower fibres from the 

 deep surface of Poupart's 

 ligament ; 15'', conjoined 

 tendon of the internal ob- 

 lique and transversalis, de- 

 scending to the pectineal 

 line ; between 15' and 15", 

 the internal inguinal aper- 

 ture; 15, on the left side, cut 

 edge of the internal oblique, 

 shown diagrammatically, to 

 indicate the manner iu 

 which its tendon splits to 

 form the sheath of the 

 rectus muscle ; 16, the 

 tendon or aponeurosis of 

 the external oblique muscle, 

 uniting in front with the 

 sheath of tlie rectus. 



position of the other is 

 variable. The inter- 

 sections do not usually 

 penetrate the whole 

 thickness of the mus- 

 cle, but are confined 

 chiefly to its anterior 



fibres, and are firmly united to the anterior wall of the sheath of the 

 muscle, while the posterior surface of the muscle has no attachment to 

 the sheath. 



.1 



The lineee transversEE have been regarded as indications of the abdominal ribs 



VOL. I. y 



