enter spinal cord via dorsal root from abdominopelvic viscera OR enter

Enter spinal cord via dorsal root from abdominopelvic

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enter spinal cord via dorsal root (from abdominopelvic viscera) OR enter brainstem via CNs V, VII, IX, and X (from mouth, pharynx, larynx, thoracic viscera) Impulses arrive at the solitary nucleus Solitary nucleus relays impulses to reticular formation, cardiovascular, and respiratory centers, but not cerebral cortex… unconscious sensations Visceral Sensory Pathway destination
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5/21/19 7 Motor Pathways Visceral motor pathways: ANS Chapter 16 Somatic motor pathways – stimulate skeletal muscle via • reflexes planned actions Organization of Motor pathways begin: primary motor cortex end: skeletal muscles 2 neurons Upper motor neuron (UMN): soma located in CNS processing center Lower motor neuron (LMN): soma located in a nucleus of brain stem or ventral horn Three Motor pathways Corticospinal Medial Lateral FYI: Activity monitored & adjusted by basal nuclei – cerebellum
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5/21/19 8 Corticospinal pathway - also called pyramidal system Voluntary control over skeletal muscles pyramidal cells (UMNs) of the primary motor cortex synpase on LMNs Tracts form pyramids LMNs located in the brainstem or in ventral horn of spinal cord LMNs fibers extend to effectors Corticospinal pathway Contains three paired tracts Lateral corticospinal tracts Anterior corticospinal tracts Corticobulbar tracts Motor cortex precentral gyrus Differential representation of different muscles groups is evident motor homunculus muscles with high numbers of motor units: large area of cortex Muscle groups with the largest cortical area representation include those of the fingers/thumb, lips, tongue, vocal cords
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5/21/19
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  • Spring '18
  • Mark Bolke
  • Corticospinal tract, Visceral Sensory Pathways

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