( A ) There are seven pairs of vertebrosternal, three pairs of vertebrochondral and two pairs of vertebral rib
( B ) Each rib is a flat thin bone and all the ribs are
connected dorsally to the thoracic vertebrae and
ventrally to the sternum.
( C ) 8th, 9th and 10th pairs of ribs articulate directly
with the sternum.
( D ) 11th and 12th pairs of ribs are connected to the
sternum with the help of hyaline cartilage.