What Is Oblique Ridge

oblique ridge a variable linear elevation obliquely crossing the occlusive surface of a maxillary molar

What forms the oblique ridge?

These ridges are formed by intramuscular tendons of the subscapularis muscle. The costal or ventral surface of the scapula presents a broad concavity, the subscapular fossa. The medial two-thirds of the fossa are marked by several oblique ridges, which run lateralward and upward.

Where does an oblique ridge run?

Permanent Maxillary Molars An oblique ridge runs from mesiopalatal to distobuccal with a distinct fissure between the larger mesiopalatal cusp and the distopalatal cusp. The largest cusp of the permanent first molar crown is the mesiopalatal, but the mesiobuccal is the highest.