Question

In human beings, the second cervical vertebra helps in rotatory movements of the head through knob- like process, called:
A. Prezygapophysis
B. Postzygapophysis
C. Odontoid process
D. None of the above

Answer 1

In life structures, the second cervical vertebra (C2) of the spine has been named the hub (from Latin hub, "hub") or epistropheus. By the Atlanta-hub joint, it frames the turn whereupon the principal cervical vertebra (the map book), which conveys the head, rotates. That curious element provides for the vertebra a once in a while utilized third name: vertebra dentata.

Complete answer:
In human life structures, the second cervical vertebra (C-2) of the spine is named the hub vertebrae. It shapes the turn whereupon the main cervical vertebra (the map book), which conveys the head, pivots.
The most particular quality of this bone is the solid odontoid process, known as the caves, which rises oppositely from the upper surface of the body. So, option C is correct.
The prevalent processes or prezygapophysis venture upward from a lower vertebra, and their articular surfaces are coordinated pretty much in reverse (slanted coronal plane). So, option A is incorrect.
The mediocre processes or postzygapophysis venture descending from a higher vertebra, and their articular surfaces are coordinated pretty much forward and outward. So, option B is incorrect.
Hence, option C is correct.

Note: The odontoid process, additionally called the lairs, is a projection of the hub. Perilous breaks can happen because of powers following up on this anatomical structure because of its closeness to the spinal string and brainstem. One of the most noticeable highlights of the pivot bone is a prevalent, tooth-like projection called the odontoid process (or nooks). It expresses with the front curve of the map book bone, where they structure a turning joint.