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32 Cards in this Set
- Front
- Back
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Name the 3 types of sensory receptors
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interoceptors
proprioceptors exteroceptors |
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what is the action o interoceptors and give ex
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take signal from within the body
ec: stomach distension |
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what is the action of proprioceptors
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sense changes in body position
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what is the action of exteroceptors
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respond to outside stimuli
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what are the two types of adapting receptors
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slowly adaptng
rapidly adapting |
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what are thetwo ways that neurons which synapse in the CNS spread their signal
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rapid signal
slow signal |
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rapid signals activate what type of receptors?
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ionotropic receptors- activates ion channel
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slow signals activate what type of receptors
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metabotropic receptors - work through GPCR
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name examples that use ionotropic receptors
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somatosensory receptors
auditory receptors vestibular receptors |
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names examples of receptors that activate metabotropic receptors
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photoreceptors
olfactory receptors some tase receptors some visceral receptors |
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what are the two broad categorie of cutaneous sensory receptors
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encapsulated
unencapsulated |
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give examples of encapsulated receptors
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pacinian corpuscle
meissner's corpuscle ruffini ending |
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describe the pacinian corpuscle(what it responds to, where it's found, rapid or slow adapting)
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stimulated by vibration
rapidly adapting found in hypoderis or in deep dermis |
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describe the meissner's corpuscle (what it responds to, where it's found, rapid or slow adapting)
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senses fine touch
rapidly adapting found in dermal papilla |
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describe the ruffini ending(what it responds to, where it's found, rapid or slow adapting)
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responds to pressure
slowly adapting |
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give examples of non-encapsulated sensory receptors
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endings around hairs
merkel cells free nerve endings |
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what is the importance of the "endings around hairs"
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respond to touch
rapidly adapting |
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what type of stimuli do merkel cells respond to
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touch
slowly adapting |
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what do free nerve endings respond to
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pain, temp, itch, touch
adaptation varies depending on modality they are sensing |
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what are examples of rapidly adapting
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endings around hair
pacinian corpuscle meissner's corpuscle |
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give examples of slow adapting receptors
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merkel endings
ruffini endings |
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what are merkel cells derived from?
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neural crest
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what type of receptors are merkel cells?
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mechanoreceptors
non-encapsulated sense pressure, texture, touch |
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what are merkel cells in contact with?
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sensory nerve fibers called merkel endings
endings project from dermis to epidermis terminate in a nerve plate |
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in what part of the body are meissner's corpuscle found in great abundance
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dermal papillae
tips of fingers |
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what are muscle spindles?
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proprioceptors
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what are the two kinds of intrafusal muscle fibers
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nuclear chain fibers (thin)
nuclear bag fibers (extended) |
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describe how musce spindles sense position
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when biceps is contracted - muscle spindle is unstretched and electrically silent
stretching the muscle causes little response when the muscle spindle contracts - gamma motor neurons fir action potential resets sensitivity |
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what is the golgi tendon organ
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large diameter afferent fibers that enter a capsule at te myotendious junction
branch and interweave with collagen when muscle contracts, it pulls on the tendon, causing tension on capsule to squeeze the nerves in the GTO - nerves will fire |
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what type of receptors have AB fibers?
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meissner corpuscle
merkel endings pacinian corpuscle |
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what type of receptors have delta fibers
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sharp pain, cold, some touch
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what type of receptors have C fibers?
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slow pain, heat, itch some touch
post ganglionic autonomic efferents |
