A mechanoreceptor is a sensory receptor that responds to mechanical pressure or distortion. Normally there are four main types in glabrous skin: Pacinian corpuscles, Meissner's corpuscles, Merkel's discs, and Ruffini endings. There are also mechanoreceptors in hairy skin, and the hair cells in the cochlea are the most sensitive mechanoreceptors, transducing air pressure waves into nerve signals sent to the brain. In the periodontal ligament, there are some mechanoreceptors, which allow the jaw to relax when biting down on hard objects; the mesencephalic nucleus is responsible for this reflex.

Read more about Mechanoreceptor:  Mechanism of Sensation, History, Pacinian Corpuscle, Muscle Spindles and The Stretch Reflex

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Stretch-activated Ion Channel - Functions
... mechanical stimulus, for example by the mechanoreceptors in an animal's vibrissae (whiskers) ... This results from the specialized mechanoreceptor cells that are superimposed upon the afferent nerve fibers ... Stretch-activated ion channels are located on these mechanoreceptor cells and serve to lower the action potential threshold, thus making the afferent nerves more sensitive to ...