Question

a. The joint in which a moving bone rotates freely inside the ring formed by another bone -
b. It connects the hind limbs to the central structure of the ribcage and backbone -
c. It is made up of 33 small bones​

Answer 1

Explanation:

Pivot joint, also called rotary joint, or trochoid joint, in vertebrate anatomy, a freely moveable joint (diarthrosis) that allows only rotary movement around a single axis. The moving bone rotates within a ring that is formed from a second bone and adjoining ligament. The pivot joint is exemplified by the joint between the atlas and the axis (first and second cervical vertebrae), directly under the skull, which allows for turning of the head from side to side. Pivot joints also provide for the twisting movement of the bones of the forearm (radius and ulna) against the upper arm, a movement used, for instance, in unscrewing the lid of a jar.

Answer 2

Answer:

The joint in which a moving bone rotates freely inside the ring formed by another bone -

Pivot joint, also called rotary joint, or trochoid joint, in vertebrate anatomy, a freely moveable joint (diarthrosis) that allows only rotary movement around a single axis. The moving bone rotates within a ring that is formed from a second bone and adjoining ligament

It connects the hind limbs to the central structure of the ribcage and backbone -

the pectoral girdle connects hind limbs to the central structure of the rib cage and back bone 

It is made up of 33 small bones

Vertebrae - consist of 33 small bones