English Wikipedia - The Free Encycl...
Download this dictionary
Internal anal sphincter
The
internal anal sphincter
, IAS, (or
sphincter ani internus
) is a muscular ring that surrounds about 2.5–4.0 cm of the
anal canal
; its inferior border is in contact with, but quite separate from, the
external anal sphincter
.
See more at Wikipedia.org...
© This article uses material from
Wikipedia
®
and is licensed under the
GNU Free Documentation License
and under the
Creative Commons Attribution-ShareAlike License