Final answer:
The spaces found within the lesser pelvis are the paravesical fossa and the pararectal fossa.
Step-by-step explanation:
The two spaces found within the lesser pelvis are the paravesical fossa and the pararectal fossa. The lesser pelvis, also known as the true pelvis, encompasses these spaces and contains the bladder and other pelvic organs. The pelvic brim or pelvic inlet separates the lesser from the greater pelvis, and the pelvic outlet defines its inferior limit.