THE GALL-BLADDER 



421 



FIG. 395. FROM A SECTION THROUGH THE WALL OF A DOG'S GALL-BLADDER. 

 a, epithelium; b, lymph nodule; c, serous coat. X 80. (After Sudler.) 



It is connected with the muscularis by a thin layer of denser connective 

 tissue which contains blood and lymphatic vessels and which simulates a 

 submucosa. 



FIG. 396. RECONSTRUCTION OF THE WALL OF A DOG'S GALL-BLADDER. 

 a, vein; b, artery; c, lymphatic vessel; d, epithelium. X 60. (After Sudler.) 



The gall-bladder possesses a distinct muscular wall, consisting of 

 numerous interlacing smooth muscle bundles the most of which are cir- 

 cularly disposed. Occasionally they form fairly distin^ circular and 

 longitudinal layers. 



