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Pelvic (General)

Bryan Applications, P

The skeleton of the lowest part of the trunk is formed by a basin-like structure, the pelvis, which is made up of the innominate bones at the sides and in front, and a triangular mass of bone known as the sacrum behind. The sacrum consists of five vertebrae fused together and has at its tip the coccyx. The gaps which exist in the skeleton are filled in by muscles and membranes, so that a closed basin is actually formed.

The floor of the basin is pierced by the urethra and anus, however, and in the female by the vagina as well. The pelvis is described as consisting of two parts, the true pelvis and the false pelvis. The latter is the part on a level with the expanded portions of the iliac bones which is bounded below by a definite ridge or margin, beneath which is the true pelvis In the true pelvis are the bladder and rectum, and in the female the womb and its appendages.

Coils of intestine also ar~ disposed over the top of these organs. Round the brim of the true pelvis run the iliac blood vessels, and on either side the ureter dips in over the brim to join the bladder. On the left side the large bowel also dips down to become the rectum. At the back of the pelvis, lying on the front of the sacrum, is the network of nerves known as the sacral plexus. The pressure of the child’s head on these nerves during labor may cause severe pain. Deformity of the bones of the pelvis, caused by rickets and other disorders, may interpose a serious and sometimes complete obstruction of the birth of a child.

Fracture of the pelvis may happen when a person is run over by a heavy vehicle. The bladder or other internal organs may be crushed or torn in this event. For applications; See: Joint..