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17 Cards in this Set
- Front
- Back
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medulla oblongata plays a role as an ____ ____ center
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autonomic relay
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5 major structures of medulla oblongata
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pyramids - visceral motor nuclei - ascending sensory tract nuclei - cranial nerves - reticular formation
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pyramids are ____ bulges containing ____ ____
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anterior - white matter
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pyramids carry ____ tracts running from the ____ ____ (pathway for voluntary muscle movement)
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corticospinal - motor cortex
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pyramids crossover or ____ in the lower ____
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decussate - medulla
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decussation of pyramid is where
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fibers cross over in the lower medulla
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2 visceral motor nuclei
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cardiovascular centers - respiratory centers
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cardiac center controls ____ & ____ of heart contraction
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force - rate
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vasomotor center regulates ____ ____ & changes the diameter of ____ ____ walls
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body position - blood vessel
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respiratory centers control ____ & ____ of breathing
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rate - depth
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respiratory centers work with centers in the ____
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pons
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other centers regulate activities such as (5)
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hiccupping - vomiting - swallowing - coughing - sneezing
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5 cranial nerves in the medulla oblongata
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VII - IX - X - XI - XII
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reticular formation are neuron cell bodies scattered in ____ matter of the ____, ____, & ____
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white - midbrain - pons - medulla
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reticular formation project to the (4)
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hypothalamus - thalamus - cerebellum - spinal cord
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reticular formation govern ____ of brain by sending continuous impulses to ____ ____ to keep it alert (ras)
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arousal - cerebral cortex
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reticular formation filters out ____ or ____ signals to dampen unnecessary input
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repetitive - weak
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