Rectal ampulla
Encyclopedia
The rectal ampulla is the dilated section of the rectum
where feces
are stored until they are eliminated via the anal canal
. The caliber of the rectum at its commencement is similar to that of the sigmoid colon
, but near its termination it dilates, forming the ampulla.
Rectum
The rectum is the final straight portion of the large intestine in some mammals, and the gut in others, terminating in the anus. The human rectum is about 12 cm long...
where feces
Feces
Feces, faeces, or fæces is a waste product from an animal's digestive tract expelled through the anus or cloaca during defecation.-Etymology:...
are stored until they are eliminated via the anal canal
Anal canal
The anal canal is the terminal part of the large intestine.It is situated between the rectum and anus, below the level of the pelvic diaphragm. It lies in the anal triangle of perineum in between the right and left ischioanal fossa....
. The caliber of the rectum at its commencement is similar to that of the sigmoid colon
Sigmoid colon
The sigmoid colon is the part of the large intestine that is closest to the rectum and anus. It forms a loop that averages about 40 cm...
, but near its termination it dilates, forming the ampulla.