rectal ampulla

ampulla rec’ti; bagian rektum yang melebar tepat proksimal terhadap canalis analis.

rectal ampulla (Wikipedia)
"Rectal" redirects here. For the route of administration, see Rectal administration. For the conic sections, see Latus rectum and Semi-latus rectum.
Human rectum
Drawing of human colon seen from front. The rectum consists of the distal portion of the colon, here coloured red
Rectum anatomy en.svg
Anatomy of the anus and rectum
Precursor Hindgut
Artery Superior rectal artery (first two-thirds of rectum), middle rectal artery (last third of rectum)
Vein Superior rectal veins, middle rectal veins
Nerve Inferior anal nerves, inferior mesenteric ganglia
Lymph Inferior mesenteric lymph nodes, pararectal lymph nodes, internal iliac lymph nodes, Deep inguinal lymph nodes
Latin Rectum
MeSH A03.556.124.526.767
TA A05.7.04.001
FMA 14544
Anatomical terminology
The lumen (inside) of a normal human rectum in a 70 year old seen at colonoscopy
Retroflexed view of the human rectum seen at colonoscopy showing anal verge

The rectum (from the Latin rectum intestinum, meaning straight intestine) is the final straight portion of the large intestine in humans and some other mammals, and the gut in others. The human rectum is about 12 centimetres (4.7 in) long, and begins at the rectosigmoid junction (the end of the sigmoid colon), at the level of the third sacral vertebra or the sacral promontory depending upon what definition is used. Its caliber is similar to that of the sigmoid colon at its commencement, but it is dilated near its termination, forming the rectal ampulla. It terminates at the level of the anorectal ring (the level of the puborectalis sling) or the dentate line, again depending upon which definition is used. In humans, the rectum is followed by the anal canal, before the gastrointestinal tract terminates at the anal verge.