( A ) First six pairs of ribs are true ribs.
( B ) Ribs have two articulation surfaces on its ventral end and is hence called bicephalic.
( C ) The 8th, 9th and 10th pairs of ribs do not articulate directly with the sternum but join the seventh rib with the help of hyaline cartilage and are called vertebrochondral ribs.
( D ) Last 2 pairs (11th and 12th) of ribs are not connected dorsally and are called false ribs.
