<prompt> Vibrations are felt by ?Meissners corpuscleMerkels discPacinian corpuscleRuffinis end organ  <response>: Ans. is c i.e., Pacinian corpuscle Tactile touch receptors These are general exteroreceptors for epicritic senses. These are divided into superficial and deep receptors. Superficial receptors are present in the epidermis or papillary layer of dermis. In glabrous nonhairy skin these receptors are Merkels disc slowly adapting and Meissner s corpuscle rapidly adapting. In hairy skin there are hair follicle receptors. Deep receptors are present in deeper dermis or in the subcutaneous tissues. The deep receptors are same in both hair and nonhairy skin and include Ruffinis end organ slowly adapting and Pacinian corpuscle Rapidly adapting. Touch, pressure and vibration are different forms of same sensation. Pressure is felt when the force applied on the skin is sufficient to reach the deep receptors, whereas touch is felt when the force is insufficent to reach the deep receptors, therefore detected by superficial receptors Merkels disc, meissners corpuscle. Vibrations are rhythmic variations in pressure i.e. rhymic variations of force that reaches the deep receptors. Whether a tactile receptor senses pressure or vibration depends on whether the receptor is slowly adapting or slowly adaping :? i Slowly adapting Ruffinis end organ :- Are meant to detect sustained pressure; they are useless for vibrations. ii Rapidly adapting Pacinian corpuscle :- Stop discharge in response to sustained pressure; they are useful only when the pressure fluctuates rapidly, i.e. during vibrations. The higher the rate of adaptation of a receptor, the greater is the vibration frequency it can detect. Thus, tactile touch sensation can be divided into :? A Superficial generally considered as touch :- Detected by Meissner s corpuscle detect texture of surface, i.e. rough or smooth and Merkels disc detect two point discrimination. B Deep i Pressure Deep touch :- Detected by Ruffinis end organ. ii Vibrations :- Detected by Pacinian corpuscle 