Question

Atlas vertebra of man is characterized by

• A. Proceolous centrum
• B. Acoelous centrum
• C. Amphicoelous centrum
• D. Absence of centrum

Answer 1

The correct option is D Absence of centrum

• Cervical vertebrae are the vertebrae present in the neck region of the body, immediately below the skull.
• The cervical vertebrae are numbered as C1-C7. The first two, C1 and C2, are highly specialized and are given unique names: atlas(first cervical vertebra) and axis (second cervical vertebra).
• The centrum is the large anterior middle portion of the vertebra.
• Atlas vertebra of man is characterized by the absence of centrum because of its small size.
  
• So, the correct answer is 'Absence of centrum'.