QS Study

Receptors are a part of a neuron or specialized cells which can generate an action potential in the neuron. They are often located in the sense organs, such as the ear, eye, and skin. Cutaneous receptors are a part of the somatosensory system. They include cutaneous mechanoreceptors, nociceptors (pain) and thermoreceptors (temperature).

Cutaneous receptors / Receptors found in skin

(A) Expanded ending.

  • End-organ of Ruffini – Ruffini corpuscle is a slowly adapting mechanoreceptor located in the cutaneous tissue.
  • Markel’s disks – They are nerve endings and provide information on mechanical pressure, position, and deep static touch features.

(B) Encapsulated

  • Pacinian corpuscles – They are nerve endings in the skin responsible for sensitivity to vibration and pressure.
  • Meissner’s corpuscles – They are a type of nerve ending in the skin that is responsible for sensitivity to light touch.
  • End bulb of Krause – The end-bulbs of Krause are thermoreceptors, sensing cold temperatures.

(C) Free nerve ending – It is an unspecialized, afferent nerve fiber ending of a sensory neuron.

The function of main three receptors –

Free nerve routing

These are nerve nociceptors that means sanative to pain. They are widespread in the superficial layers of the skin as well as in certain internal tissues.

Meissner’s corpuscles: These are sensitive to touch and related to two-point discrimination that is they permit to distinguish between two closely placed pointed stimuli.

Pacinian corpuscles: These corpuscles respond to pressure and vibration.