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| ruffini corpuscles |
-stimulated by stretch of skin
-in deep layers of skin
-sustained pressure |
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mcs5109 Mon, 20 Oct 2008 01:46:31 GMT |
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| pacinian corpuscles |
-senses vibration
-in deep layers of skin |
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mcs5109 Mon, 20 Oct 2008 01:46:31 GMT |
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| meissner's corpuscle |
-responds to flutter and stroking mvts
-in superficial layers of skin |
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mcs5109 Mon, 20 Oct 2008 01:46:31 GMT |
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| muscle spindle |
-muscle receptors that send signal about muscle length |
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mcs5109 Mon, 20 Oct 2008 01:38:52 GMT |
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| golgi tendon organs |
-receptors found at muscle/tendon junctions
-respond to stretch and contraction of muscle |
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mcs5109 Mon, 20 Oct 2008 01:38:52 GMT |
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| generator potentials |
-capable of "adaptation" |
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mcs5109 Mon, 20 Oct 2008 01:38:52 GMT |
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| ruffini end organs |
-sustained pressure
-stimulated by stretch of skin
-in deep layers of skin |
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mcs5109 Mon, 20 Oct 2008 01:38:52 GMT |
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| hair root plexus |
-weave around hair root |
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mcs5109 Mon, 20 Oct 2008 01:38:52 GMT |
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| skin receptor types |
-pressure/touch
-temp
-pain |
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mcs5109 Mon, 20 Oct 2008 01:38:52 GMT |
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| olfactory |
-Olfactory Nerve I
-bipolar receptors (olfactory cells) synapse with secondary neurons in olfactory bulb
-bipolar receptors only neurons that overturn (60 day cycle)
-1000 different odor receptors |
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mcs5109 Fri, 17 Oct 2008 04:11:11 GMT |
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| nerves in taste |
Facial Nerve VII
Glassopharyngeal Nerve IX
Vagus X to a lesser extent
-Hypoglossal XII is motor to tongue
-Trigeminsl V is general sensation for tongue |
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mcs5109 Fri, 17 Oct 2008 04:06:29 GMT |
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| Tastes |
-all trigger Ca+2 entry
-neurotransmitter released
-dissolve in saliva
-interact with apical membrane
-intracellular Ca+2 signals in all
-triggers exocytosis of neurotransmitter
--intiates a series of APs in the sensory neuron |
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mcs5109 Fri, 17 Oct 2008 04:06:29 GMT |
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| salty |
-tip and lateral
-Na+ accumulates
-triggers AP |
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mcs5109 Fri, 17 Oct 2008 04:06:29 GMT |
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| Sour |
-lateral
-H+ closes K+ channels
-triggers AP |
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mcs5109 Fri, 17 Oct 2008 04:06:29 GMT |
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| Sweet |
-tip
-trigger ligand binding
-changes cAMP |
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mcs5109 Fri, 17 Oct 2008 04:06:29 GMT |
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| bitter |
-rear
-triggers receptor binding
-changes IP3 |
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mcs5109 Fri, 17 Oct 2008 04:06:29 GMT |
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| taste |
-chemoreceptors
-5 sensations: sour, sweet, salty, bitter, umami (glutamate and some nucleotides; MSG) |
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mcs5109 Fri, 17 Oct 2008 04:06:29 GMT |
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| muscles and joints |
-proprioception: muslce spindles/golgi tendon organs
-position of muscles/joints
-knee jerk reflex prevents over stretching |
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mcs5109 Fri, 17 Oct 2008 04:06:29 GMT |
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| pain |
-naked nerve endings in skin
-dermatones and referred pain (multiple primary sensory neurons converge on a single ascending tract; get messed up) |
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mcs5109 Fri, 17 Oct 2008 03:51:06 GMT |
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| temperature |
-naked nerve ending sin skin |
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mcs5109 Fri, 17 Oct 2008 03:51:06 GMT |
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| pressure/touch |
-pacinian corpuscles: respond to vibrations; deep layer of skin
-meissner's corpuscles: flutter, stroking; shallow layers in skin |
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mcs5109 Fri, 17 Oct 2008 03:51:06 GMT |
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| skin |
-many different receptors
-3 major modalities:
1. pressure/touch
2. temp
3. pain |
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mcs5109 Fri, 17 Oct 2008 03:51:06 GMT |
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