52119 3 Primary sensory cortex Each body area is differentially represented

52119 3 primary sensory cortex each body area is

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5/21/19 3 Primary sensory cortex Each body area is differentially represented proportional to number of sensory receptors Three major somatic sensory pathways Spinothalamic Posterior column Spinocerebellar Spinothalamic pathways FYI 2 tracts Anterior spinothalamic tract crude touch deep pressure Lateral spinothalamic tract – pain – temperature
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5/21/19 4 Abnormalities along spinothalamic pathways cause odd sensations Phantom limb pain Referred pain Phantom limb pain After loss of a limb… Inappropriate sensations occur when part of a labeled line is stimulated Referred pain: inaccurate localization Visceral sensory pathways transmit pain these impulses enter spinal segments, stimulating interneurons of spinothalamic pathways…terminate on primary sensory cortex
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5/21/19 5 Posterior column pathway FYI also called dorsal column-medial lemniscus pathway Sensations conveyed – fine touch – pressure – vibration – proprioception Spinocerebellar pathways 2 neurons subconscious proprioception impulses received from – joints – muscles – tendons Spinocerebellar pathways FYI Posterior spinocerebellar trunk & lower limb; ipsilateral FYI Anterior spinocerebellar trunk & lower limb; contralateral *FYI Cuneocerebellar* & rostral spinocerebellar* from trunk & upper limbs *not listed in Martini
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5/21/19 6 Visceral sensory pathways Origin Interoceptors of ventral cavity organs Receptors – nociceptors – thermoreceptors tactile receptors – baroreceptors – chemoreceptors Sensory fiber travel in the autonomic nerves Visceral Sensory Pathways
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  • Spring '18
  • Mark Bolke
  • Corticospinal tract, Visceral Sensory Pathways

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