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Definition
| stimulus energy converted or coded into neural signals by a receptor. |
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Definition
| area of the sensory epithleium which when stimulated elicits a response |
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| Peripheral innervation density |
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Definition
| density of receptors across the sensory epithelium is often not uniform and this non uniformity is often functionally important. |
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Definition
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| coded by discharge rate usually |
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Definition
| range of intensities can be perceived often exceeds the range coded by discharge rate of individual receptors |
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Term
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Definition
| stimuli quality (often achieved by different sublcasses of rececptors) |
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Definition
| Slow (tonic) or rapid (phasic) |
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Definition
| maintained throughout the aschending pathways |
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Definition
| Muller's law of specific nerve energies: perceived sensation depends upon the RECEPTOR not necessarily the stimulus. |
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Term
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Definition
| . Neurons that are firing suppress the stimulation of neighbouring neurons. In the face of inhibition, only the neurons that are most stimulated and least inhibited will fire, so the firing pattern tends to concentrate at stimulus peaks |
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Term
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Definition
| Light touch and pressure (RAI and SAI) |
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Term
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Definition
| vibration and stretch (RAII and SAII) |
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Term
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Definition
| muscles and joints. muscle spindles. golgi tendons, joint receptors. |
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Term
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Definition
| first or pricking pain. cold. well localized tonic. high threshold and large rf. |
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Definition
| unmyelinated. second or b urning pain, diffuse, warm. tonic high threshold and large rf. |
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Definition
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Definition
| Efferent axons (ventral horn contains motorneurons that innervate skeletal muscle) |
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Definition
| modulated by descending influence |
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Definition
| outershell fo spinal cord, ascending and descending pathways. |
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Term
| Dorsal column medial lemniscus |
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Definition
| two point discrimination, vibration and proprioception. 1. Cutaneous and subcutaneous mechanoreceptors. Joint receptors. and trigeminal comnent for the head. |
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Term
| Anterolateral/ spinothalamic |
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Definition
| Pain and temp, some crude touch. also a trigeminal component for the head. |
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Term
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Definition
| hemisection of the cord and it's symptoms. |
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Term
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Definition
| loss of fine touch discrimination. (not total loss) and deficitis in sterognosis. (ability to identify objects by active touching. |
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Term
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Definition
| nociceptors activation. electrical stimulation of dorsal columns can alleviate pain sensation. WIDE DYNAMIC RANGE NEURONS. exception to law of specific nerve energies. |
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Term
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Definition
| mildly affects cutaneous sensation. |
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Term
| Sensory components of thalamic relay to cortex |
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Definition
VPL (ventral posterolateral for body
VPM Ventral posteromedial for face |
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Term
| Primary somatosensory cortex |
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Definition
Parietal, Brodmann's areas 3a, 3b, 1 and 2.
Each contains a seperate map of the body surface. |
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Definition
| deep proprioceptors and muscle afferents |
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Definition
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Definition
| complex receptive fields (directional sensitivity and multidigit) |
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Definition
| more complex receptive field. ie/ shape |
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Term
| Peripheral innervation density. |
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Definition
| distorted representation in different species depdnding upon use of body part. mouth and fingers in primates. |
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Term
| Plastiity of cortical representation. |
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Definition
| SI represention of body parts depends upon USE. ie/ whiskers remved, barrels disappear. |
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Definition
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Definition
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Definition
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Definition
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| mechanosensory afferent fibers |
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Definition
| synapse onto dorsal root ganglion cells in spinal cord. |
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Term
| medial wall cortical representation |
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Definition
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Term
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Definition
| coronal what i cut in lab. |
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