Sensory Receptors and Nerve Fibers Flashcards
Sweet, Salty, Sour, Bitter, and Umami
Simple carbs Na H Alkaloids Glutamate
Sight
Sense of amount and frequency of light by retina
Photoreceptors
Hearing
Sense of amplitude and frequency of vibration by cochlea
Mechano
Taste
Sense of molecules or chem properties by taste buds
Chemo
Smell
Sense of volatile molecules by olfactory epi
Chemo
Touh
Sense of mechan forces
Mechano
Balance
Sesne of orientation of the head in 3D by vesitbular apparatus
Kinesthetic sense
Sense of body position in 3D by muscles and joints
Mechano
Temperature
Sense of temp
THermo
Pain
Sense of noxious stimuli
Nociceptors
Encapsulated vs non
Non - noci
En - meissners
Receptive fields
Area innervated by a single sensory receptor
Related to 2 point dsicrimination
Receptor adaptation
Fast detects changes
Slow detects signal state
Free nerve endings
Crude touch
Derm and epiderm
Slow
IV (C)
Hair follicle receptor
Fine touch
Hair follicles in dermis of hairy skin
Rapid
3(adelta)
Meissner’s corpuscle
Fine touch
Dermal papillae of glabrous skin
Rapid
2(abeta)
Pacinian corpuscle
Vibration
superficial fascia
Rapid
2( abeta)
Merkel cell
Pressure
Epidermis (esp lips)
Slow
2 (abeta)
Ruffini corpuscle
Stretch
Dermis and superficial fascia
Slow
2(abeta)
Primary endings
Annulospiral Change in muscle length Nuclear bag infrafusal fibers in skeletal muscle Fast 1a
Seocndary endings
Flower Spray State of muscle length Nuclear chain intrafusal fibers in skelatal muscle never 2(abeta)
Golgi tendon
Muscle tension (active contraction)
Tendons of skeletal muscle
Fast
1B
Motor innervation
Alpha motor from CNS innervate extrafusal fibers
Gamma innervate intrafusal fibers
Joint receptors have
Free endings
Ruffini
Pacinian
Golgi tendon
Sharp pain Nociceptors
Sharp pain Through skin and other organs Fast SHarp 3 (adelta)
Dull pain nociceptors
Slow
Dull,visceral pain
4(C)
Classes of nerve fibers
1a/1b - Sensory, myelin, fastest
2 - sensory, myelin, slower
3 - sensory, myelin, slower
4 - sensory unmyelin, slowest
Groups of nerve fibers
Aalpha- motor, myelin, fastest Abeta - sensory, myelin, fast Agamma - motor, myelin, medium Adelta - sensory, myelin, slowerr C - Sensory, unmyelin, slowest
Class/group overlap
2 and abeta
3 and a delta
4 and C
