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There are usually 11-12 ribs which form a
protective, flexible bony arch around the organs of the circulatory and
respiratory organs. The first seven ribs are connected behind the spinal
column and in front with the sternum. The remaining five or
"false" ribs are attached to the other ribs by cartilage.
The sternum or breastbone is a flat, narrow
bone found in the midline of the thorax or chest. The upper part
supports the clavicle and anchors seven ribs.
The pelvis is a boney ring at the lower end
of the spine and supports the axial skeleton. It also is engineered so
the legs can support the upper body in an erect, walking motion.
The sacrum is a large, triangular bone
located at the lower part of the spinal column and upper part of the
pelvis. The bone is curved which helps the pelvis to have maximum
movement.
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