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
