THE GALL BLADDER 



9S5 



The common duct has u diameter of alxmt one-fourtli of an inch (0 nnn. ). 

 Its width at the ampulhi is greater. It is narrowest at its outlet into tlie 

 duodenum. The cvstic and hejjatic ducts are a Httle narrower than the common 

 «hict. 



Structure of the gall bladder, — Tlu- wall of the gall bladder is made up of 

 three coats — serous, muscular or lilimus. and mucous. 



Fig. 586. — Abdominal Vi.scera, from liiiiiiNn. (Uudiuger.) 



DESCENDING COLON 



Inferior mesenteric 

 vein 



Vena cava 



Superior mesntteric 



reiit 

 ASCENDING COLON 



1. The serom coat being formed by the ]ieritoneuni, is only found on the lower 

 surface and i)art of the sides. li(>neath this coat is a nerve ]>lexus. 



2. T\w Jihrous coat consists of idain muscular iibres and tibrous tissue. The 

 muscular fibres run mostly hMigitndinally, some transversely. The lil»rous tissue 

 consists of white fibres running in every direction. This layer contains the i>rin- 

 cipal blood-vessels and lymphatics, and also contains a nerv«' ph-xus. 



