1308
Table of Contents > Health Dictionary > Internal anal sphincter

Internal anal sphincter

A smooth muscle ring, formed by an increase of the circular muscle fibers of the rectum, situated at the upper end of the anal canal, internal to the outer voluntary external anal sphincter. This sphincter is maximally contracted when the rectal ampulla is “at rest”—empty or relaxed to accommodate a distending fecal mass. It is inhibited with filling of the ampulla, increased distension, and peristalsis.
Healthy Living Marketplace
Eden Foods
Carlson Labs
UAS Labs DDS Probiotics
Renew Life
Now Food
Renew Life