Question

The structure that separates greater from lesser pelvis is made up of what parts?

A) Pelvic diaphragm and sacrum
B) Pelvic inlet and pelvic outlet
C) Pubic symphysis and sacral promontory
D) Pectineal line and ischial spine

Answer 1

The greater pelvis and lesser pelvis are separated by the pelvic brim, formed by the pubic symphysis and sacral promontory among other structures, making option C the correct answer.

Step-by-step explanation:

The structure separating the greater pelvis from the lesser pelvis is referred to as the pelvic brim or pelvic inlet. This structure forms the superior margin of the lesser pelvis. The pelvic brim is formed anteriorly by the upper margin of the pubic symphysis, and posteriorly by the pectineal line of the pubis, the arcuate line of the ilium, and the sacral promontory. Therefore, the components that make up the pelvic brim, which separates the greater and lesser pelvis, are the pubic symphysis, pectineal line, arcuate line, and sacral promontory. Hence, the correct answer to the question would be option C) 'Pubic symphysis and sacral promontory'.