Histopathology of the volar skin

This tissue section was cut perpendicularly to the parallel skin markings. The ridges (orange bars) and furrows (arrows) are recognized on the surface. Under the thick, cornified layer, 2 kinds of epidermal rete ridges are recognized: the crista profunda intermedia (dashed arrows) underlying the surface ridges and the crista profunda limitans (arrowheads) underlying the surface furrows. The crista profunda intermedia is passed through by an intraepidermal eccrine duct.