Question

Cervical vertebrae are characterized by the presence of
(A) Long neural spine
(B) Odontoid process
(С) Vertebral-arterial-canals
(D) None of the above

Answer 1

Vertebral column: The vertebral column is also known as backbone. It is present in the mid-dorsal region of the neck and trunk and is made up of 26 serially arranged units called vertebrae.
Vertebrae: Vertebral column protects the spinal cord, supports and protects the head and serves as the point of attachment for the ribs and musculature of the back.

Complete answer:
There are five types of vertebrae one of them is cervical vertebrae:

Cervical vertebrae: In almost all mammals including human beings the first seven vertebrae of the vertebral column constitute the cervical vertebrae. These are small sized and present in the neck region. The first vertebra is called atlas and the second is called axis.
Now let us gather information about given options:
Long neural spine: thoracic vertebrae possess a long neural spine. These thoracic vertebrae are usually larger than the cervical vertebrae. It is present in the chest. They protect heart and lungs
Odontoid process :- From the body of the axis a process of bone rises which is called the odontoid peg which articulates with the back of the anterior arch of the atlas and is held in position by the transverse ligament of the atlas but is not present in every cervical vertebrae so can not be considered as characteristic feature.
Vertebral-arterial-canals :- 1, 2, 7 cervical vertebrae are atypical and 3 to 6 are typical. The transverse processes are perforated by foramina (foramen transversarium) for the passage of the vertebral arteries except in VII Vertebrae and this forms vertebral – arterial -canals. The first cervical vertebra or atlas supports the head and consists of a complete ring of bone.
None of the above: as option C is correct this cannot be correct Our required option is c that is Vertebral-arterial-canals.

So, the correct answer is option C.

Note:
The atlas articulates with the second cervical vertebra. The second cervical vertebra that is the axis is the pivot (that shows rotation) on which the atlas turns in the rotary movements of the head. The seventh cervical vertebrae is an undivided spinous process.