Question

Pacinian corpuscles occur in the skin of certain parts of body. These are

• A. Pain receptors
• B. Types of gland
• C. Nacked tactile receptors
• D. Encapsulated pressure receptors

Answer 1

The correct option is D Encapsulated pressure receptors

There are three classes of mechanoreceptors tactile, proprioceptors, and baroreceptors. There are four primary tactile mechanoreceptors in human skin: Merkel's disks, Meissner's corpuscles, Ruffini endings, and Pacinian corpuscle; two are located toward the surface of the skin and two are located deeper. Merkel's disks are slow-adapting, unencapsulated nerve endings, which respond to light touch. Meissner's corpuscles respond to fine touch and pressure, but they also respond to low-frequency vibration or flutter. Pacinian corpuscles are rapidly adapting mechanoreceptors that sense deep, transient (not prolonged) pressure, and high-frequency vibration. Meissner's and Pacinian corpuscles are both encapsulated receptor types, surrounded by concentric layers of a specialized connective tissue. Ruffini endings are slow-adapting, encapsulated mechanoreceptors that detect skin stretch and deformations within joints. A free nerve ending is an unencapsulated dendrite of a sensory neuron; they are the most common nerve endings in the skin. Free nerve endings are sensitive to painful stimuli, to hot and cold, and to light touch.
Therefore, the correct answer is option D.