OF THE ABDOMEN. 



363 



which have received the name of linece transversce. One of these is usually 

 situated opposite the umbilicus, and two above that point; of the latter, one 

 corresponds to the extremity of the ensiform cartilage, and the other to the 

 interval between the ensiform cartilage and the umbilicus. These intersections 

 pass transversely or obliquely across the muscle in a zigzag course ; they rarely 

 extend completely through its substance, sometimes pass only halfway across 



lAnea alba. 



FIG. 2i!0. The Transversalis, Kectus, and Pyramidalis muscles. 



it, and are intimately adherent in front to the sheath in which the muscle is 

 enclosed. Sometimes one or two additional lines may be seen, one usually below 

 the umbilicus ; the position of the other, when it exists, is variable. These 

 additional lines are for the most part incomplete. 



The Rectus is enclosed in a sheath (Fig. 221) formed by the aponeuroses of the 

 Oblique and Transversalis muscles, which are arranged in the following manner. 

 When the aponeurosis of the Internal oblique arrives at the outer margin of the 

 Rectus, it divides into two lamellae, one of which passes in front of the Rectus, 



