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Pathways for sensory information and motor commands

Pathways for sensory information and motor commands. Sensory Pathways. Delivers somatic and visceral sensory information to the CNS. Sensation: information gathered by a sensory receptor. Posterior Column Pathway . Processing in the thalamus:

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Pathways for sensory information and motor commands

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  1. Pathways for sensory information and motor commands

  2. Sensory Pathways • Delivers somatic and visceral sensory information to the CNS. • Sensation: information gathered by a sensory receptor

  3. Posterior Column Pathway • Processing in the thalamus: • Determines whether you perceive sensation as fine touch, as pressure, or as vibration • Sensory homunculus: • visualizes the connection between different body • parts and areas in brain hemispheres.

  4. Corticospinal Pathway: pyramidal system • Provides voluntary control over skeletal muscles • Homunculus provides indication of how much fine motor control available hands, face, and tongue are capable of varied and complex movements

  5. Medial and Lateral Pathways • Subconscious control over skeletal muscle tone (neck, trunk and limbs) * Controls responses to equilibrium sensations (balance)

  6. Figure 8-1

  7. Sympathetic vs. Parasympathetic • Somatic Nervous System (SNS) • Operates under conscious control • SNS controls skeletal muscles • Autonomic Nervous System (ANS) • Operates without conscious instruction • ANS controls visceral effectors • Coordinates system functions: cardiovascular, respiratory, digestive, urinary, reproductive

  8. ANS: Two Divisions • Sympathetic division: • increases alertness, metabolic rate, and muscular abilities • "fight or flight" • Parasympathetic division: • reduces metabolic rate, conserves energy and promotes digestion • “rest and digest” • COMPARE

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