. Write a note on Hip (Pelvis) girdle?
Two irregular, broad (broadcast of all bones) and massive semicircular hip bones, called coxae or innominate bones, form the arch-like pelvic girdle by articulating with each other in front by a highly flexible pubic symphysis. The arch is completed behind by the sacrum and coccyx, forming a complete ring, called pelvis. The girdle provides firm articulation to the skeletal frameworks of our legs, whereas the whole pelvis acts as a circular basin to support the weight of our trunk, facilitating erect posture.
Each hip bone is formed of three bones which are separately recognizable in children, but subsequently become completely fused. These three bones are (1) ilium forming the upper, broadcast part of the coxa and prominence of hip, (2) ischium forming medial portion of the lower parts of coxa. (3) pubis forming anterior portion of the lower parts of coxa. A small area where the three bones meet is in the form of a deep socket called acetabulum. The head of thigh bone (femur) remains articulated into this socket. Main parts of ischium and pubis are separated by a large space, called obturator foramen.
Pelvis of women is quite flexible to facilitate pregnancy and parturition (child birth).