ANATOMY IN A NUTSHELL. 



323 



matter from it into the small intestine, while they readily allow of a passage the 

 other way. This is the ileo-caeeal valve or valve of Bauhini. 



The large intestine is supplied with blood by the branches of the superior 



PLATE CXLV. 



LIFT MASTOID PROCESS 



GUST' 



TWELFTH NERVE. 



INT. LARYNGEAL N. 



HYOIDBONE 



The Extrinsic Muscles of the Tongue. 



mesenteric and inferior mesenteric arteries, while it also receives a blood sup- 

 ply from the internal iliac at the rectum. The vessels form a contiunous series 

 of arches from the caecum, where the vasa intestini tenuis anastomose with 

 the ileo-colic, the first branch of the superior mesenteric given to the huge in- 

 testine. The blood supply of the rectum is from the inferior mesenteric by the 

 Superior hemorrhoidal, from the internal iliac, by the middle hemorrhoidal, and 

 from the internal pudic by the inferior hemorrhoidal. The vessels at the lower 

 end of the rectum assume a longitudinal direction, communicating freely at the 

 anus and less freely above. The blood of the large intestine is turned into the 

 portal vein by means of the superior mesenteric and inferior mesenteric veins. 

 At the rectum a communication is se1 up between the systemic and portal sys- 

 tem of veins, since some of the Mood of that pari of the intestine is returned into 

 the internal iliac veins. In the lower end of the rectum the vein.-, like the arter- 

 ies, are arranged longitudinally. This arrangement is called the hemorrhoidal 

 plexus. 



