The relation between the pelvis and the pelvic organs of the female
With so many sex ed textbooks and encyclopedias giving the standard “vertical cross section” view of the pelvis, or showing the organs without any context, it can be difficult to see in the mind exactly where everything lays.
In this diagram, "P" indicates the part of the sacrum that is both at its top, and farthest “forward” in the body. Below that point, it curves backwards.
"S" is the pubic symphysis, which is the joint that brings together the two sides of the pelvis. It’s largely immobile, but very slightly stretchable with trauma or childbirth.
"F" is the fundus of the uterus - a fundus is the part of a hollow organ that is farthest from its opening.
"O" is the ovary, embraced (but not touched) by the fallopian tubes.
"R" is the rectum, the lowest section of the intestine, which travels behind the reproductive organs.
"B" is the bladder, which lays in front of the reproductive organs.
There are two primary parts to the pelvis: the pelvic spine, which includes the sacrum and coccyx; and the pelvic girdle, which is probably what you associate with “pelvis” - this is the two “pelvic bones”, the hip bones or coxal bones.
As children, we have six hip bones - three on each side. The ilium (the big “wing” part, where the abdominal muscles attach), the pubis (that upper part of the “eyes” in the pelvis), and the ischium (the lower bit of the “eyes”, the “sit bone”). By age 25, all three sections have fused together, leaving us with just two hip bones.
An American Text-Book of Obstetrics for Practitioners and Students. Edited by Richard C. Norris, 1895.
random fact: the uterus and the fallopian tubes look nothing like this “rendition” at all, the fallopian tubes are long and thinner than angel hair pasta, and the uterus is also quite tiny.