Pain and Temperature_08

Pain and Temperature_08 - Myelinated A-fibers Pain Receptor...

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Sensory Perception Receptor Specificity Photoreceptors, Mechanoreceptors, etc. Pathway Specificity Optic Nerve, Conscious Proprioception, etc.
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Temperature Receptors Heterogeneous Distribution Cold/Warm = 4/1 Sensory Adaptation [20 – 40 ºC] Can perceive 0.2 ºC ΔT step Cannot perceive a slow ΔT
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Pain Protopathic Dull, Chronic, Poorly Localized Burn Non-myelinated C-fibers Epicritic Sharp, Short Duration, Well Localized Needle Prick
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Unformatted text preview: Myelinated A-fibers Pain Receptor • Chemoreceptor Sensitive to: – K + released from damaged cells – Bradykinin from WBC – Histamine – Acetylcholine – Serotonin P&T Pathways • Spinoreticular medullary RF • Spinotectal mesencephalon • Lateral Spinothalamic Tract – Primary P&T pathway • Anterior Spinothalamic Tract – Light Touch and Tickle Crotaline Snakes Terminal Nerve Mass Melanophila Acuminata...
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This note was uploaded on 09/28/2009 for the course BME 365R taught by Professor Rylander during the Fall '09 term at University of Texas.

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Pain and Temperature_08 - Myelinated A-fibers Pain Receptor...

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