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• 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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- Winter '13