Pelvis anatomy
The pelvis is the ring of bone where the trunk meets the legs, below the abdomen, formed by the two hip bones, the sacrum and the coccyx. The pelvic cavity inside holds the bladder and rectum, and in women the uterus and ovaries. The head of the femur fits into the socket on the side of each hip bone, the acetabulum, to form the hip joint.
Frequently asked questions
How many bones make up the pelvis?
In the adult, four: the two hip bones, the sacrum and the coccyx. Each hip bone forms from three bones, the ilium, ischium and pubis, that fuse into one during growth.
Which organs are inside the pelvis?
The bladder and the rectum. In women the uterus, ovaries and upper vagina also lie in the pelvis; in men, the prostate and seminal vesicles.
Which joints join the bones of the pelvis?
At the back the sacrum meets each hip bone at a sacroiliac joint, and at the front the two hip bones meet at the pubic symphysis. On the outside each hip bone forms the hip joint with the femur.
Parts in the pelvis
Bones of the pelvis
Joints of the pelvis
Bone counts
Other regions
Read more
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Once the 3D model loads you can turn it and select each part.