366 



ANATOMY AND PHYSIOLOGY 



scrobiculus cortli- \ pit i tin- tomach, is a slight depression at 

 the very point of t.hc :,ul ostal anjde, caused by a weak spot in the 

 attachment of the abdominal muscles. If the abdomen is greatly 

 distended, the depression di:-.appears. The linea alba is between 

 the two rectus muscles, and the semilunar lines (or linea semi- 

 lunares) are at the sides of the recti. The transverse lines (linea 

 transfer see) may be seen when the recti contract. 



The subcutaneous inguinal ring is just above the tubercle of the 

 pubic bone; the abdominal inguinal ring is a half inch above the 



'I i|: i.f MI iL, nri i .irlilage 

 I .,'l;il Ur.l.r 



Upper liriti/niil.il |.l,iii'- 



Lower horizontal tilanr A, at 

 level of tubercles of iliac 

 crcRt 



I.OWrr li',n/< nl.i! I'l.inr I',. :il 



cvel of ;u/i' n',r ih.it xpinet 



Vriliial plane A, from middle 

 of Poupart'it ligun 



Vertical plane B, at outer 

 IxMilT of rectui (irtni- 

 ln n.ii line) 



Summit of sym|>hysix |nihii 



Fio. 235. DIAGRAM or THE ABDOMINAL REGIONS. (Morris.) 



middle of the inguinal ligament. The conjoined tendon is behind 

 the subcutaneous ring. 



The abdominal muscles and skin are supplied by the lower 

 intercostal and first lumbar nerves. 



The regions of the abdomen are outlined in the following 

 manner: Imagine a horizontal plane passing through the ab- 

 domen at the level of the tenth costal cartilage, and another at the 

 level of the anterior superior spine of the ilium. These would 

 divide it into three portions upper, middle, and lower. Then 

 imagine two vertical planes passing through the middle point of 

 the inguinal ligament on either side, and dividing each of these 

 three portions into three regions, making nine in all. 



