Transcription of The Nervous System: Tracts of the Spinal Cord
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The Nervous System: Tracts of the Spinal Cord
15. The Nervous System: sensory and Motor Tracts of the Spinal Cord PowerPoint Lecture Presentations prepared by Steven Bassett Southeast Community College Lincoln, Nebraska 2012 Pearson Education, Inc. Introduction Millions of sensory neurons are delivering information to the CNS all the time Millions of motor neurons are causing the body to respond in a variety of ways sensory and motor neurons travel by different Tracts within the Spinal cord 2012 Pearson Education, Inc. sensory and Motor Tracts Communication to and from the brain involves Tracts Ascending Tracts are sensory Deliver information to the brain Descending Tracts are motor Deliver information to the periphery 2012 Pearson Education, Inc.
A Sensory Homunculus A sensory homunculus (“little human”) is a functional map of the primary sensory cortex. The proportions are very different from those of the individual because the area of sensory cortex devoted to a particular body region is proportional to the number of sensory receptors it contains.
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