Med Neuro Lect2 Peripheral Somatic Sensory
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| show | 1.Extroceptive (mechanoreceptors): sense touch, pressure, & vibration.
2.Proprioceptive (Kinesthesia): sense position & movement.
3.Interoceptive (nocioceptive): sense temperature & pain as well as tissue condition
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| show | Directly correlated: The more senisitive an area is (the more sensory nerves, the less stimulation required to transmit a signal) the larger its representation is in the cortex.
**Hands: large cortex, Calf: small cortex representation.
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| show | Aalpha & beta fibers are large, with uniform and quick conductions.
**type C fibers are small, with non-uniform, prolonged conduction velocties.
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| Which nerves provide us with Epicritic senses? What are their conduction speeds? Are they encapsulated? | show 🗑
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| Which nerves provide us with Protopathic senses? What are their conduction speeds? Are they encapsulated? | show 🗑
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| 4 types of cutaneous touch corpuscles | show 🗑
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| show | 1.Location: Deep in Dermis.
2.Adaptation: Slow.
3.Sensation detected: Shape & size of displacement.
4.Receptive field: Large.
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| show | 1.Location: Superficial (b/w dermis & epidermis).
2.Adaptation: Rapid.
3.Sensation detected: Stimulus movement (low freq vibration).
4.Receptive field: Small.
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| Pacinian Corpuscle: location, type of adaptation, type of sensation detected, size of receptive field? | show 🗑
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| Merkel's Disc: location, type of adaptation, type of sensation detected, size of receptive field? | show 🗑
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| What determies how the cutaneous touch corpuscle will repsond to a stimuli? | show 🗑
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| show | 1.Stimuli pressure compresses the capusle which causes large signal.
2.Steady state occurs if stimuli doesn't move, the capsulated nerve will stop sending signals.
3.When the stimulus pressure is removed from the capsule, nerve will fire again.
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| When is the only time rapidly adapting corpuscles (pacinian & Meisner's) will send signals? | show 🗑
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| When is the only time slowly adapting corpuscles (Merkel's discs & Ruffini's endings) will send signals? | show 🗑
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| show | NO:
1.Pacinian movement stimuli: High frequency, low threshold/skin indentation.
2.Meisner's: Low frequency, high threshold/skin indentation.
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| Why are small receptive fields advantageous? which corpuscles have small receptive fields? | show 🗑
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| show | 1.DSC: Medial: Feet/Sacral, Lateral: Hands/cervical.
2.SCT: Medial: Hands/cervical, Lateral: Feet/sacral.
3.ALS: Medial: Hands/cervical, Lateral: Feet/Sacral.
Medial:
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