254 



MUSCLES OF THE ABDOMEN. 



internal oblique muscle ; it is separated from the muscle of the other side 

 by a narrow interval, which is occupied by a dense fibrous structure, the 

 linea alba afterwards described. It arises from the upper margin of the 

 pubes by a flat tendon consisting of two parts, of which the internal is much 



Fig. 200. 



Fig. 200. DEEP MUSCLES 



OP THE FOREPART OF 



THE TRUNK AND SHOUL- 

 DER. 



The explanation of the 

 references from 1 to 11 has 

 already been given, in the 

 description of fig. 173. 



, coracoid process ; &, 

 sternum ; c, c, cartilages 

 of the fifth ribs ; d, ensi- 

 form portion of the ster- 

 num ; e, symphysis pubis ; 

 /, anterior superior iliac 

 spine ; 12, on the fifth and 

 eighth ribs, near the in- 

 sertion of the serratus 

 magnus ; 13, on the right 

 side, the rectus abdominis 

 completely exposed ; on 

 the left side 13', 13', the 

 divided ends of the same 

 muscle, a portion being re- 

 moved ; 14, points to the 

 pyramidalis 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 or deep in- 

 guinal aperture.arched over 

 by the muscular fibres ; 15, 

 on the left side, cut edge 

 of the internal oblique, 

 shown diagrammatically, 

 to indicate the manner in 

 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 the rectus. 



the smaller, and is con- 

 nected with the liga- 

 ments covering the 



pubic symphysis, while the external one is fixed to the pubic crest. 

 Expanding and becoming thinner at the upper end, the muscle is inserted 

 into the cartilages of three ribs, the fifth, sixth, ani seventh, usually by 



