Term
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Definition
| organs are innervated by both sympathetic and parasympathetic neurons |
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Term
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Definition
| many parasympathetic neurons travel together in the vagus nerve |
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Term
| What are the three types of sensory receptors? |
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Definition
1. Free Nerve Endings (dendrites)
2. Spinal structure at the end of afferent neuron
3. Seperate specialized cell that synapses with an afferent neuron |
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Term
| What is receptor potential? |
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Definition
| graded potential that occurs in sensory receptors |
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Term
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Definition
| the afferent neuron and all of the sensory receptors attached to it |
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Term
| where are sensory units located? |
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Definition
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Term
| What happens after stimulating a sensory receptor? |
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Definition
1. AP increase along the afferent neuron
2. Enter the spinal cord on dorsal side
-contralateral or ipsilateral
4. goes to thalamus
4. goes to cerebral cortex |
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Term
| Where are the spinothalamic tracts? |
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Definition
| up the spinal cord and to the brain |
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Term
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Definition
| when the AP cross over at the point of entry then go to the thalamus |
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Term
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Definition
| when AP travel up the spinal cord on the same side and cross over later in the medulla then goto the thalamus |
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Term
| What is the effect of the parasympathetic nervous system on the heart rate? |
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Definition
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Term
| Sympathetic nervous system on pupil size? |
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Definition
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Term
| Where does the sensory input enter? |
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Definition
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Term
| What do contralateral convey? |
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Definition
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Term
| What does Ipsilater convey? |
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Definition
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Term
| Where is the most sensative part of the receptive field? |
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Definition
| center because it has more receptors than the edges |
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Term
| What is the Law of Projection? |
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Definition
| If sensory pathway is stimulated anywhere along its course, the experienced sensation will be that of the original sensory receptor |
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Term
| What is the thalamus reffered to as? |
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Definition
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Term
| What three types of info are related by sensory neurons? |
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Definition
1. Types of stimuli - due to a variety of types of specialized receptors
2. Intensity
A.) # of Sensory units activated (more hurts worse)
B.) By frequency of action potentials (!!!!!!LOUD….! !! ! ! SOFT
3. Localize |
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Term
| What is lateral inhibition? |
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Definition
When one ascending sensory path inhibits actoin potential frequency in an adjacent path
ex. pressing on thumb when it hurts |
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Term
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Definition
| One path enhances another |
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Term
| What are the two types of sensory receptors based on prolonged stimuli? |
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Definition
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Term
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Definition
A type of sensory receptor that decreases action potential frequencies despite constant stimulus?
TOUCH AND ADAPTATION |
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Term
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Definition
A sensory recepter that has constant action potentials as long as the stimulous is present?
PAIN |
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