15_16_17_Somatosensation_SpinCtrlMvt_BrainCtrlMvt

15_16_17_Somatosensation_SpinCtrlMvt_BrainCtrlMvt - SPHSC...

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SPHSC 449 Spinal Cord Somatosensory System (Ascending  Tracts) Slides created by Susan  McLaughlin and Beate Peter 1
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2 Spinal Cord
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3
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4 Dermatomes
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5 Marieb, E.N. (1995).  Human Anatomy and  Physiology, 3 rd  Ed.  Redwood City: Benjamin/ Cummings Spinal Cord
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6 Spinal Cord Marieb, E.N. (1995).  Human Anatomy and Physiology, 3 rd  Ed.   Redwood City: Benjamin/Cummings General organization:  Sensory processes are  dorsal, motor processes  are ventral
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7 Spinal Cord Marieb, E.N. (1995).  Human Anatomy and Physiology, 3 rd  Ed.   Redwood City: Benjamin/Cummings
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8 Spinal Cord Marieb, E.N. (1995).  Human Anatomy and Physiology, 3 rd  Ed.   Redwood City: Benjamin/Cummings
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9 Marieb, E.N. (1995).  Human Anatomy and Physiology, 3 rd  Ed.   Redwood City: Benjamin/Cummings
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10
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11 Ascending Pathways: Overview Gracilis:  Fine touch,  lower body Cuneatus:  Fine touch,  upper body Lateral S-T:  Pain,  temperature Anterior S-T:  Diffuse touch Marieb, E.N. (1995).  Human Anatomy and  Physiology, 3 rd  Ed.  Redwood City: Benjamin/ Cummings Together: Dorsal column – medial lemniscal pathway
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12 Descending Pathways: Overview Marieb, E.N. (1995).  Human Anatomy and Physiology, 3 rd  Ed.   Redwood City: Benjamin/Cummings Direct (pyramidal)  tracts Indirect  (extrapyramidal)  tracts Dorsal Ventral
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13 Ascending Pathways Somatosensory system conducts sensory impulses  ascending to various regions in the brain Chains of two or three successive neurons (“first,”  “second,” “third order neurons) Types of stimuli: Mechanoreception Touch (fine vs. crude), pressure, vibration, proprioception,  kinesthesia Thermoreception Hot, cold Nocireception Sharp pain, diffuse pain
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14 Ascending Pathways: Receptors Receptors are the starting points of  somatosensory processing Quickly adapting receptors respond strongly at  first, then fade Nonadapting receptors do not respond as  strongly but maintain their response level Three types of receptors: Encapsulated endings (fluid-filled bubbles that  respond to mechanical stimuli) Free endings Expanded tip endings
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15 Ascending Pathways: Receptors Encapsulated endings (these are not the  somas!) Meissner’s corpuscles Pacinian corpuscles Found in the skin Strong response, quickly adapting Vibration, fine discriminative touch
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16 Marieb, E.N. (1995).  Human Anatomy and Physiology, 3 rd  Ed.   Redwood City: Benjamin/Cummings
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17
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18 Ascending Pathways: Receptors Free nerve endings Non-adapting Send slow signals Pain, temperature Found in body, skin, visceral organs Marieb, E.N. (1995).  Human Anatomy and Physiology, 3 rd  Ed.   Redwood City: Benjamin/Cummings
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Ascending Pathways: General  Organization Bhatnagar, (2002).  Neuroscience for the Study of Communicative  Disorders, 2 nd
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This note was uploaded on 09/09/2009 for the course SPHSC 444 taught by Professor Peter during the Summer '09 term at University of Washington.

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15_16_17_Somatosensation_SpinCtrlMvt_BrainCtrlMvt - SPHSC...

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