Sensory Receptors FA 452 Flashcards
Free nerve endings
Description
Location
Senses
C- slow, unmyelinated fibers
A- delta – fast, myelinated fibers
All skin, epidermis, some viscera
Pain and temperature
Meissner corpuscles
Description
Location
Senses
Large, myelinated fibers; adapt quickly
Glabrous (hairless) skin
Dynamic, fine/light touch, position sense
Pacinian corpuscles
Description
Location
Senses
Large, myelinated fibers; adapt quickly
Deep skin layers, ligaments, and joints
vibration, pressure
Merkel discs
Description
Location
Senses
Large, myelinated fivers; adapt slowly
Finger tips, superficial skin
Pressure, deep static touch (shapes, edges), position sense
Ruffini corpuscles
Description
Location
Senses
Dendritic endings with capsule; adapt slowly
Finger tips, joints, soles of feet
Pressure, slippage of objects along surface of skin, joint angle change
What is slow adapting
Sends a continuous electrical signal throughout a continuous stimulus
What is Rapidly adapting
Sends an electrical signal only at the beginning and end of a continuous stimulus
Sensory receptor (fiber)?:
Pricking pain (fast, myelinated)
A-delta fibers
Sensory receptor (fiber)?:
Burning or dull pain and itch (slow unmyelinated)
C- fibers
Sensory receptor (fiber)?:
Receptor for cold sensation
Free nerve ending–A-delta fibers
Sensory receptor (fiber)?: Receptor for warm sensation
C- polymodal receptor: warm thermorecptor
Sensory receptor (fiber)?: Vibration and pressure
Paciniar corpuscle
Sensory receptor (fiber)?: Dynamic/changing light, discriminatory touch
Meissner corpusle
Sensory receptor (fiber)?: Static unchanging light touch
Merkle discs
Sensory receptor (fiber)?: Proprioception information-- muscle lengthening
Muscle spindle
Sensory receptor (fiber)?: Proprioception information-- muscle tension monitoring
Golgi Tendon organ
resembles an onion in cross section?
Pacinian Corpuscle
Robust spindle-shaped structures found particularly on the soles of the feet
Ruffini ending
Found only in areas of skin without hair (fingertips, lips, eyelids…etc)
Meissner corpuscles
Simplest sensory receptor thought to be pain receptor or thermoreceptor
Free nerve ending
Touch receptor that is tough to distinguish from melanocytes
Merkle cells
