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Throughway for sensory neurons assending target of

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Unformatted text preview: tter. • Throughway for sensory neurons assending • Target of cranial nerves 12 pairs--deal with sensory and motor coordination--and autonomical functions 10 KNES 462 ©FK ‘08 Brain Stem: Structures • Medulla oblongata: contains centers responsible for vital rf-- specail tissue goes through whole brainstem autonomic functions: breathing, control of heart rate, digestion (reticular formation); contains the ‘decussation’. • Pons: conveys movement information from cerebral pons--means bridge-hemispheres to cerebellum; contains cell groups hemispheres to cerebellum; contains cell groups projecting to the cerebellum via the ‘peduncles’, fiber bundles by which the cerebellum is attached to the pons. • Midbrain: contains neurons/nuclei pertaining to sensory / motor functions, eye movements, coordination of visual & auditory reflexes. 11 KNES 462 functional sig of brain stem--motor and sonsory processess and is required for consciousness ©FK ‘08 medial pathways-- Brain Stem: descending pathways I Again somatotopic organization: • medial pathways: proximal, axial muscles • lateral pathways: distal muscles pathways: distal muscles • (aminergic pathways: modulate excitability of motor pathways) 12 KNES 462 to not carry motor information ©FK ‘08 4 KNES 462 Brain Stem: descending pathways II • medial pathways terminate in the ipsilateral they do not cross over ventromedial part onto propriospinal neurons; – vestibulospinal tracts: carry information for reflex control of balance and...
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