The Peripheral Nervous System

The Peripheral Nervous System - • Tonic receptors adapt...

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The Peripheral Nervous System
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Sensory Receptors- Transmit 4 different types of information 1. Modality- vision, taste, hearing, feeling 2. Location- where is the stimulus coming from? Receptive field Projection 3. Intensity 4. Duration Phasic Receptors- adapt to…. Temp Tonic Receptors- pain receptors- act slowly Adaptation Characteristics- Excitable- sending a signal to a neuron Selective- respond only to a specific type of stimulus 1 st Component of Reflex Arc Classification by stimulus type- Thermo-receptor, mechanical-receptor, pain-receptors (nociceptors), chemoreceptors, photoreceptors Classification by location- Interoceptors- viscera, inside, stomach stretch
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Sensory Receptors Classification by structure Free nerve endings Encapsulated dendritic endings- covering around the outside,
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Somatosensory System Neural integration levels Receptor level- where receptors are located Specificity
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Unformatted text preview: • Tonic receptors- adapt slowly • Phasic receptors- adapt quickly • Adaptation- ability to ignore it Somatosensory System • Neural integration levels – Circuit level • Sending info from receptors up to CNS, deliver impulses to cerebral cortex • Where is the stimulus located? • How much perception is there? – Perception drops out at the receptor itself then thalamus – Perceptual level • Third order neurons send all the information all the way to Cerebral Cortex – Projection – Aspects » Detecting- what has happened » Magnitude- how much stimulus occurring » Special Discrimination- where it is you’re touching, one tough or two touch Reflex Arcs • Components • Types – Stretch reflex – Golgi tendon reflex- receptors in tendon of muscle, responds to excessive tension in tendon – Flexor (withdrawal) reflex-– Crossed Extensor Reflex...
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This note was uploaded on 09/14/2011 for the course BIO 227 taught by Professor Lonsdale during the Fall '10 term at Boise State.

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The Peripheral Nervous System - • Tonic receptors adapt...

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