482 



THE MUSCULAR SYSTEM. 



surface, but nob extending through the entire substance of the muscle, are three or 

 more transverse tendinous intersections (inscriptiones tendinese). adherent to the 

 sheath of the muscle ; the lowest opposite the umbilicus, and the highest about 

 the level of the xiphoid process. The medial border of the muscle lies alongside 

 the linea alba ; its lateral border is convex, and corresponds to the linea semilunaris. 

 The muscle is pierced by the terminal branches of the lower thoracic nerves. 



Aponeurosis of 



obliquus externus 



abdominis (reflected) 



RECTUS ABDOMINIS 



Anterior lamella of 

 sheath of rectus 



Linea alba 



OBLIQUUS EX- 

 TERNUS ABDOMINIS 



OBLIQUUS IN- 

 TERNUS ABDOMINIS 



Aponeurosis of 

 obliquus externus 



Inguinal ligament 



Aponeurosis of 



obliquus externus 



(reflected) 



CREMASTER MUSCLE 



Spermatic funiculus 



OBLIQUUS EXTI 

 ABDOMINIS 



RECTUS ABDOM 

 (cut) 



Posterior lame 

 ' rectal sheath 



Anterior lamel 

 sheath of rectv 



Aponeurosis o1 

 obliquus exter 



OBLIQUT'S INTI 

 ABDOMINIS 



TRANSVERSUS 



ABDOMINIS 



. Linea semicir i 

 of Douglas 



.. "Fascia transv k 



RECTUS ABDO 1 

 -. (cut) 



Inguinal liga -t 

 Obliquus exl '< 

 aponeurosis 

 jpT (reflected) 

 PYRAMIDALI^ 



ABDOMINIS 



Suspensory 

 of penis 



FIG. 428. DEEP DISSECTION OF THE ABDOMINAL WALL. THE RECTUS MUSCLE AND ITS SHEATH. 



Vagina M. Recti Abdominis. The sheath of the rectus muscle is derived 

 from the aponeuroses of the lateral muscles of the abdominal wall, which, aftei 

 enclosing the muscle, give rise, in the median plane, to the linea alba. At the line* 

 semilunaris along the lateral border of the rectus muscle, the aponeurosis of th< 

 obliquus internus splits into anterior and posterior layers. The anterior layer 

 joined by the aponeurosis of the obliquus externus, passes in front of the rectus 

 and constitutes the anterior lamina of the sheath. The posterior layer, joined b; 



