1.Which two pairs of cusp triangular ridges make up or join to form the two transverse ridges on a mandibular second molar? 2. Which ridges form the boundaries of the mesial triangular fossa of a...

1.Which two pairs of cusp triangular ridges make up or join to form the two transverse ridges on a mandibular second molar?

2. Which ridges form the boundaries of the mesial triangular fossa of a mandibular molar?

a. triangular ridge of mesiobuccal cusp

b. triangular ridge of mesiolingual cusp

c. Mesial marginal ridge

d. Buccal cusp ridge of mesiobuccal cusp

e. Lingual cusp ridge of mesiolingual cusp