On its superficial aspect, the epidermis has ridges called papillae that project upward toward the surface of the skin.

Name: On its superficial aspect, the epidermis has ridges called papillae that project upward toward the surface of the skin.
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The papillae are actually part of the dermis, not the epidermis. They project upward into the epidermis, helping to interlock and increase the surface area for nutrient exchange between these layers.

On Its Superficial Aspect, the Epidermis Has Ridges Called Papillae