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49 Cards in this Set
- Front
- Back
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receptors that mediate fine touch and 2 point discrimination
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Merkel Discs and Meissner's Corpuscles
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Receptors that give the sharpest resolution of the texture of surface of objects...bumpy vs. smooth
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Merkel Discks
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Merkel Discs are innervated by which type of axon?
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AB
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Merkel Discs are __ adapting?
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Slowly Adapting
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nerve ending in Merkel Disc
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free nerve ending at dermal/epidermal border
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where is the high density of Merkel Discs?
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fingertips and around the mouth
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where is the low density of Merkel Discs?
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on the back
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type of receptive field of a Merkel Disc?
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many small sensitive spots innervated by a single axon
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what are Meissner's Corpuscles specifically good at?
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Sensing abrupt changes in edges, bumps, and corners of objects.....encode low frequency vibration (flutter)
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the receptive field of Meissner's Corpuscles
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is a single spot
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what do Meissner's Corpuscle enclose?
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a flattened stack of epithelial cells
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type of axon in Meissner's Corpuscle?
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AB
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Meisner's Corpuscles are __ Adapting?
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Rapidly
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Where are Meissner's Corpuscles located?
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on globular (not hairy) skin- tips of fingers and palms
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Fxn of Ruffini Endings
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repsond to the stretch of skin...sense the force of gravity against the skin
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what do Ruffini Endings help determine the shape of?
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grasped objects when the skin is stretched
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receptive endings of Ruffini Endings
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large and diffuse b/c deep in the dermins
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nerve ending of Ruffini Ending?
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Encapsulated
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What do the axons of Ruffini fibers surround?
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collagen fibrils...wraps around and between
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myelination of axons of Ruffini endings
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AB
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Ruffini Endings are ___ Adapting
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Slowly Adapting in response to the stretch of the skin in one direction
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What is the most sensitive mechanoreceptor?
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Pacinian Corpuscles
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What to Pacinian Corpuscles respond to?
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High Frequency Vibration
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receptive field of Pacinian Corpuscle?
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Large and Diffuse
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nerve endings of Pacinian Corpuscle?
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fluid-filled capsule is wrapped around the bare nerve ending...filters out all sustained stimuli
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type of myelination of Pacinican Corpuscle?
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AB
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Pacinian Corpuscles are __ Adapting?
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Rapidly
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which type of mechanoreceptor responds to very high frequencies and small indentations?
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Pacinian Corpuscle
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which type of mechanoreceptor responds to very low frequencies and large indentations?
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Meissner's Corpuscle
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Where is the receptive field of hair follicle receptors?
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around the base of the hair follicle
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nerve endings of hair follicles
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bare axon is wrapped around the hair follicle
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myelination of hair follicle receptors
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AB or A@
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Hair follicle receptors are __ Adapting
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Rapidly Adapting...respond to velocity of hair movement
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which receptors are the best at encoding the spatial dots in the experiement?
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Merkel Disc
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why don't Pacinian Corpuscles fire appropriately to the spacing of the dots in the experiment?
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their receptive fields are too large...do not encode 2 point discrimination or texture well
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the axons of cooling receptors
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A@
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receptive fields of cooling receptors
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very small...infrequent in distribution
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the axons of warming receptors
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C- unmyelinated
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receptive fields of Warming Receptors
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very small
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Myelination of A-mechanoreceptors?
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A@
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what do A-mechanoreceptors respond to?
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intense mechanical force and very intense noxious heat
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describe nerve endings of A-mechanoreceptors
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free nerve endings that branch at the dermal/epidermal border
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adaptation of A-mechanoreceptors?
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slowly adapting
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receptive fields of A-mechanoreceptors
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small, punctate
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myelination of C- Polymodal nociceptors
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C- unmyelinated
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what do C-Polymodal nociceptors respond to?
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intense mechanical force, high thermal heat, noxious chemicals (bradykinin, histamine)
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nerve endings of C Polymodal nociceptors
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free- can respond to chemcials produced during inflammation
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receptive fields of C Polymodal nociceptors
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small
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what teyp of pain do C Polymodal nociceptors mediate?
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slow, burning, aching, long-lasting pain....dull pain that is difficult to localize
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