Pelvic cavity
The rectum is to be found in the lower part of the abdominal cavity.
The rectum is where faeces (poop) comes out, it isn't IN any body cavity.
in the pelvic cavity
Colon
Yes, the rectum is in the abdominopelvic cavity. But, the anal canal, which is inferior to the rectum is outside of the abdominopelvic cavity.
The prostate gland is located in the pelvic cavity, situated below the bladder and in front of the rectum.
The large intestine belongs to the abdominal cavity. It is located in the lower part of the abdominal cavity, where it mainly functions to absorb water and salts from undigested food and to eliminate waste from the body.
The rectum is the largest portion of the anal cavity.
The rectouterine pouch is the extension of the peritoneal cavity between the rectum and the posterior wall of the uterus in the female human body.
The abdominopelvic cavity contains the organs of the urinary system.
That would be the cranium or cranial cavity.
The pelvic cavity is the most inferior body cavity. The pelvic cavity is bounded by the bones of the pelvis. The pelvic cavity primarily contains reproductive organs, the urinary bladder, the pelvic colon, and the rectum.