what is the purpose of the capsule that surrounds the Pacinian corpuscle?
when the capsule is compressed, energy is transferred to the nerve terminal, its membrane is deformed and mechanosensitive channels open. Current flowing through the channels generates a receptor potential which is depolarizing. If the depolarization is large enough, the axon will fire an action potential. But the capsule layers are slick, with viscous fluid between them. If the stimulus pressure is maintained, the layers slip past one another and transfer of stimulus energy in such a way that the axon terminal is no longer deformed and the receptor potential dissipates. When pressure is released, the events reverse themselves; the terminal depolarizes again and may fire another action potential.