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Lecture 18

CAS BI 106 Lecture 18: Anatomy Lecture 18

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CAS BI 106
Dale Pasino

Lecture 18 32427 Phantom Pain Phantom pain: pain associated with a body part that has been removed (amputated) o The dendrites may have been cut, but the cell body and axon are still intact o CNS portions of pathway are intact, too Referred Pain CNS pathway shared between somatic (under skin) and visceral nociceptors (in walls of organs) o They share anatomical ascending tracts. Somatic pain is more common (we feel it more) Brain cannot distinguish between inputs. If you have pain in your appendix you think it pain in your tummy. Brain makes assumptions o Example: if someone is having a heart attack they will say they are having pain in their chest, shoulder region o Somatic pain is reported and visceral connection is made in a hospital Somatic pain is more common, brain assumes somatic over visceral General Senses: touch Touch is complex Combination of stretch, pressure, distortion of hair follicles, vibration, sensations come together to create accurate picture of discriminatory touch Different types of touch receptors Receptors can be o Unencapsulated: dendrites of a sensory neuron. Better at fine point touch. And pain heat cold. Free nerve endings. Better with pain heat and cold o Encapsulated: specialized structures involving neuron and other cells and tissues. Epithelial cells that wrap around the dendrites. Pressure and widespread touch are better received. Better at pressure The receptive Field Receptive field: the area in which the receptor can detect stimuli Receptive field in sensory neuron and motor unit in motor neuron o Small receptive field= precise location and very sensitive. fingers o Large receptive field= hard to tell exactly where, not very sensitive. back Visceral Senses Monitor stretch, temperature, chemical changes and irritation Translates these into: hunger, fullness, pain, nausea or well being free unencapsulated Visceral pain triggered by unusual stimuli: o Not cutting, manipulation or removal of tissue o Yes: cramping, stretch, inflammation o Stretching of your stomach wall is the feeling of being full Gustation (taste) (chemo receptor)
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