The accessory or extra cusp (or slight elevation) present on human upper molar teeth.

It's the "fifth" cusp, and is apparently present in about 60 % of upper first permanent molars. The "typical" upper first molar has four cusps: mesio-buccal, mesio-palatal, disto-buccal and disto-palatal. This extra cusp is usually on the palatal side on the mesio-palatal cusp - like an extra projection hanging off the tooth that can be felt by the tongue.

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