216 



MUSCLES OP THE ABDOMEN. 



passes in front of the rectus to the linea alba ; the upper three-fourths, 

 with the posterior lamella of the internal oblique behind it. 



The posterior aponeurosis of the transversalis divides into three la- 



Fig. 93.* 



* A lateral view of the trunk of the body, shewing its muscles, and particu- 

 larly the transversalis abdominis. 1. The costal origin of the latissimus dorsi 

 muscle. 2. The serratus magnus. 3. The upper part of the external oblique 

 muscle divided in the direction best calculated to shew the muscles beneath 

 without interfering with its indigitations with the serratus magnus. 4. Two of 

 the external intercostal muscles. 5. Two of the internal intercostals. 6. The 

 transversalis muscle. 7- Its posterior aponeurosis. 8. Its anterior aponeu- 

 rosis forming the most posterior layer of the sheath of the rectus. Q. The lower 

 part of the left rectus with the aponeurosis of the transversalis passing in front. 

 10. The right rectus muscle. 11. The arched opening left between the lower 

 border of the transversalis muscle and Poupart's ligament, through which the 

 spermatic cord and hernia pass. 12. The gluteus maximus, and medius, and 

 tensor vaginae femoris muscles invested by fascia lata. 



