Changes

***Surrounds the anus.

***Surrounds the anus.

***Excretory ducts of the anal sacs open into this region.

***Excretory ducts of the anal sacs open into this region.

****Anal sacs are large, coiled apocrine tubules.

****Large, coiled apocrine tubules.

****Anal sacs have many glands in their walls.

****Have many glands in their walls.

****These glands are tubuloalveolar and produce a fatty secretion.

****These glands are tubuloalveolar and produce a fatty secretion.

****Anal sacs are clinically important as they are commonly diseased in dogs - frequently, they become enlarged due to accumulated secretion.

****Anal sacs are clinically important as they are commonly diseased in dogs - frequently, they become enlarged due to accumulated secretion.