In the following illustration, structure "a" refers to a fossa, which is a convexity or bulge on a tooth. Structure "b" refers to a ridge, which is a concavity or depression within a tooth.
A) Both statements are true.
B) The first statement is true; the second statement is false.
C) The first statement is false; the second statement is true.
D) Both statement are false.

Question

Quizplus · Accepted Answer

Although the structures are correctly identified, the descriptive comments are reversed so both statements are incorrect. A fossa is a concavity or depression within a tooth. A ridge is a convexity or bulge on a tooth. More specifically, "a" is the lingual fossa; "b" is the distal marginal ridge.

In the Following Illustration, Structure "A" Refers to a Fossa