Body is a funny thing, made up of a bunch of interconnected but different systems. You might not have a lot of tactile corpuscles in that area but there are definitely nerves there. At the end of the nerves are specific types of cells that act as sensors⦠except for free floating nerves, which are responsible for that itch sensation⦠those are everywhere.
This is probably due to Pacinian corpuscles!
Thanks chatGPT for listing things out so nicelyā¦
Nerve sensors, or sensory receptors, for tactile sensations, itch, and temperature are specialized structures in the skin and other tissues. Hereās a breakdown of the types associated with each sensation:
Tactile (Touch) Sensors
- Merkel Cells/Discs
Function: Detect sustained touch and pressure.
Location: Found in the epidermis, especially in fingertips and lips.
- Meissnerās Corpuscles
Function: Detect light touch and vibration.
Location: Found in the dermal papillae of hairless skin, like palms and soles.
- Pacinian Corpuscles
Function: Detect deep pressure and high-frequency vibration.
Location: Found deep in the dermis and in subcutaneous tissue.
- Ruffini Endings
Function: Detect skin stretch and sustained pressure.
Location: Found in the dermis and joint capsules.
- Free Nerve Endings
Function: Detect light touch and pain.
Location: Widely distributed in the skin.
- Hair Follicle Receptors
Function: Detect movement of hair.
Location: Around hair follicles.
Itch Sensors
- Free Nerve Endings (Specific Subtypes)
Function: Detect chemical and mechanical irritation that causes itch (pruritus).
Location: Primarily in the epidermis.
Notes: Respond to histamine and other chemical mediators of itch, such as proteases.
Temperature Sensors
- Thermoreceptors (Free Nerve Endings)
Subtypes:
Cold Receptors (A-delta fibers): Detect cooling sensations.
Warm Receptors (C fibers): Detect warming sensations.
Location: Distributed throughout the skin.
- Polymodal Receptors
Function: Detect extreme temperatures and pain (nociception).
Location: Found in the epidermis and dermis.
These sensory receptors send signals to the brain via specific pathways in the peripheral and central nervous systems to allow the perception of touch, itch, and temperature.