question_answer

In frog the vertebra, with an anterior convex surface, is :

A) atlas                                      

B)  urostyle

C) 8th vertebra                      

D) 9th vertebra

Correct Answer: D

Solution :

The centrum of 9th vertebra (= sacral vertebra) of frog is a coelous (convex at both ends)?the anterior convexity is single and large for articulation with the posterior concavity of the centrum of 8th vertebra.