Hip bone muscles. Monotremes and marsupials also possess a fourth pair of bones, the prepubes or "marsupial bones", which extend forward from the pubes, and help to support the abdominal muscles and, in marsupials, the pouch. In placental mammals, the pelvis as a whole is generally wider in females than in males, to allow for the birth of the young. The pelvic bones of cetaceans were formerly considered to be vestigial, but they are now known to play a role in sexual selection. Hip bone The hip bone (os coxa, innominate bone, pelvic bone or coxal bone) is a large flat bone,
Bones (instrument) the palm by the tip of the ring finger placed on its edge, while the other bone is left free to move in the "hinge" formed by the index and middle fingers as they gently hold it. It is also possible to play the "hinge" on the lower (ring finger) bone while locking the top (index finger) bone against the palm. A player may use a pair of bones in each hand, or just a single pair in one hand. A critical element to playing the bones is not trying to force them to make contact with one another through