Each rib is a flat thin bone and all the ribs are connected dorsally to the thoracic vertebrae and ventrally to the sternum

There are seven pairs of vertebrosternal, three pairs of vertebrochondral and two pairs of vertebral ribs

8^th, 9^th and 10^th pairs of ribs articulate directly with the sternum

11^th and 12^th pairs of ribs are connected to the sternum with the help of hyaline cartilage.

Myasthenia gravis

Botulism

Tetany

Muscular dystrophy

detaches the myosin head from the actin filament

binds to troponin to remove the masking of active sites on actin for myosin

prevents the formation of bonds between the myosin cross bridges and the actin filament.

activates the myosin ATPase by binding to it

cartilaginous joint

synovial joint

saddle joint

fibrous joint.