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Neurons do not touch each other. Junction b/ two neurons that keeps them from touching is...
Explain reflex arc
Sensory neuron in skin is stimulated and impulse is carried to central nervous system. There sensory neuron forms synapse w one or more interneurons. Interneuron passes impulse on to motor neuron which carries impulse to the muscle and a body movement happens. At same time, interneurons send impulse to barin, telling of the stimulus it received. Muscle usually reacts before brain gets the message. So reflex arcs are involuntary.
What does the cerebrospinal fluid do
Fills spaces around brain and spinal cord. it nourishes and cushions.
axons and myelin sheaths make up which matter of the brain...white or gray matter
white matter. They are the deeper tissues
7 regions of the brain
cerebum, thalamus, hypothalamus, midbrain, pons, medulla oblongata, cerebellum
part of brain that contains respiratory and cardiac control centers and controls some reflexes
Part of brain (gray matter) that receives sensations and decides which are important enough to send on
part of brain b/ thalamus and pons that controls body movements, vision and hearing reflexes
Spinal cord Gray matter is what shape...contains interneurons and cell bodies of sensory and motor neurons
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