THE GALL-BLADDER 



421 



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' \ /--' 





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

 a, epithelium; 6, 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 hlood and lymphatic vessels and which simulates a 

 submucosa. 



d 



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

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



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

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

 cularly disposed. Occasionally they form fairly distinct circular and 

 longitudinal layers. 



