Merkel's discs detect sustained touch and pressure.

Merkel's discs are arborizations of nonmyelinated axons that end in terminals on specialized tactile cells and which detect sustained touch and pressure.

Normally there are four main types in glabrous skin: Pacinian corpuscles, Meissner's corpuscles, Merkel's discs, and Ruffini endings.

Examples of mechanoreceptors include baroreceptors which detect changes in blood pressure, Merkel's discs which detect sustained touch and pressure, and hair cells which detect sound stimuli.