Pacinian corpuscles are nerve endings present in
the skin, some mucous membranes etc. They are
mechanoceptors, responding to pressure, or any
kind of mechanical stimulus causing a deformation
of the corpuscle.
The Pacinian corpuscle has a single nerve fiber.
Its end is covered by a sensitive receptor membrane
that will signal when the membrane is deformed in
any way. It is surrounded by several concentric
capsules of connective tissue, with a viscous gel
between them.