Somatic Sensation

Somatic Sensation - SOMATIC SENSATION Reading, Somatic...

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SOMATIC SENSATION Reading, Somatic sensation and pain: B & L Chapter 7
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Click to edit Master subtitle style Cutaneous (skin) Deep TOUCH PRESSURE PAIN PAIN WARM POSITION COOL Separate and independent neural systems for each modality from periphery up to cortex How are the cutaneous modalities distributed across the skin? Modalities of somatic sensation: qualitatively different sensations
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Punctate or mosaic nature of skin sensation: any point on skin gives rise to one and only one sensation, T, C, W, P T C P W 1 mm physiological/anatomical explanation: look at how the skin is innervated
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DEFINITIONS: axons that innervate the body Primary afferent fibers= First order fibers Transduction accomplished at fiber ending, no special receptor cells as in vision or audition
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General plan of innervation of the body
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disease of dorsal root ganglion: “shingles” painful rash with blisters varicella virus, the same virus that causes chickenpox (it is a herpes virus, also called herpes zoster) the virus lies dormant in the DRG the virus may reactivate as shingles travels down sensory nerve and affects skin rash is seen in skin innervated by that nerve sometimes with severe pain, postherpetic neuralgia skin can remain painful and sensitive to touch for months or even years after the rash clears up
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WHAT ACTIVATES THE DORMANT VIRUS? conditions that weaken the body's immune (defense) system, such as aging,
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This note was uploaded on 02/22/2011 for the course PGY 451 taught by Professor Baizer during the Spring '09 term at SUNY Buffalo.

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Somatic Sensation - SOMATIC SENSATION Reading, Somatic...

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