476 



ANATOMY IN A NUTSHELL. 



1. Peritoneum. 



2. Extra-peritoneal fat. 

 .'■>. Transversalis fascia. 



4. Conjoined tendon, which takes the place of cremasteric fascia in the- 

 indirect hernia. 



5. Intercolumnar fascia, which takes the place of infnndibnliform in the 

 indirect hernia. 



6. Two layers of superficial fascia. 



7. Skin. 



PLATE CCLVI. 



CORONOID 

 PROC. 



A-MASSETER. 



B-BUCCINATOR. 



C-LEVATOR-MENTI. 



D-DEPRESSOR-LABU- INF. 



E-DEPRESSOR-ANGULI-ORIS 



F-PLATYSMA-MYOIDES. 



G- MENTAL FORAMEN. 



MENTAL m/A ' 





PROC. 



groove for facial artery. 

 External Surface of Inferior Maxillary Bone. 



The external abdominal ring (Plate XV) is a potential opening in the apon- 

 eurosis of the External oblique muscle which is made by the divergence of two 

 of its fasciculi. The size of this opening varies on account of the strength of 

 its sides or pillars. It is about an inch long and half an inch wide. It is situ- 

 ated above and to the outer side of the crest of the os pubis. The spermatic 

 cord in the male and the round ligament in the female passes through this 

 opening to pass from the abdomen. 



The relations of the external abdominal ring. 



Above. — A series of curved fibers called the intercolumnar. 



Below. — The crest of the os pubis. 



On Either Side. — Columns or pillars of the ring. 



