1312 



THE ORGANS OF DIGESTION 



(Fig. 1055). The ascending colon is supplied by the right colic, and the transverse colon by the 

 middle colic branch of the superior mesenteric. The descending colon is supplied by the 



MUCOUS. 

 MEMBRANE 



DILATATION 

 OF VEINS 

 COLUMNS OF. 

 MORGAGN 



VALVE OF 

 MORGAGNI 



HILTON'S 

 WHITE LINE 



MUSCULAR WALL 

 OF RECTUM 



INTERNAL HEMOR- 

 RHOIDAL PLEXUS 



DILATATION 

 OF VEIN 



COMMUNICATION BE- 

 TWEEN INTERNALAND 

 EXTERNAL HEMOR- 

 RHOIOAL PLEXUS 

 INTERNAL 

 SPHINCTER 



EXTERNAL 

 SPHINCTER 



LONGITUDINAL 

 TENDINOUS FIBRES 



SUBCUTANEOUS 

 CELLULAR TISSUE 



FIG. 1054. Inner wall of the lower end of the rectum and anus. On the right the mucous membrane has 

 been removed to show the dilatation of the veins and how they pass through the muscular wall to anastomose 

 with the external hemorrhoidal plexus. (Luschka.) 



FIG. 1055. The arterial blood supply of the anterior (ventral) surface of the cecum and appendix: A. Ileo- 



colic artery. B. Ceoal appendicular artery. D. Anterior cecal artery. F and G. Appendicular artery. Note 



that the cecal and appendicular arteries anastomose by fine capillaries, both ventrally and dorsally. C. Iliac 



artery. 1. Right colon. 2. External sacculus of cecum (to right of taenium coli). 3. Appendix. 4. Iliac 

 muscle. 5. Psoas muscle. (Robinson.) 



