tactile receptors

tactile receptors

1. Meissner corpuscles

   • Egg-shaped mass of dendrites enclosed by a capsule of connective tissue.
   • Rapidly adapting receptors
   • Found in the dermal papillae of hairless skin, where one's ability to discern spatial location of touch is highly developed.

2. hair root plexuses

   • Rapidly adapting touch receptors found in the hairy skin
   • Free nerve endings wrapped around hair follicles
   • Detect movements on the skin surface that disturb hairs

3. Merkel discs

   • Also known as type I cutaneous mechanoreceptors
   • Slowly adapting touch receptors
   • Saucer-shaped, flattened free nerve endings.
   • Found in the fingertips, hands, lips, and external genitalia.

4. Ruffini corpuscles

   • Also called as type II cutaneous mechanoreceptors
   • Elongated, encapsulated receptors.
   • Located deep in the dermis and in ligaments and tendons
   • Found in the hands, and soles
   • very slowly adapting, therefore, it's important for signaling continuous states, such is heavy prolonged touch and pressure signals

5. pacinian corpuscles

   • Large oval structure composed of a multilayered connective tissue capsule that encloses a dendrite
   • Fast adapting receptors
   • Found around joints, tendons, and muscles; in the periosteum, mammary glands, external genitalia, pancreas and urinary bladder.
     • respond to acceleration and deceleration of joints during movement

6. free nerve endings

   • found everywhere in the skin and in many other tissue.
   • can detect pressure and touch
   • Thermoreceptorsare free nerve endings
     • cold receptors, more in NO.
     • warm receptors
   • Free nerve endings and Ruffini corpuscles in the capsules of joints respond to pressure.

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