neuron and neuroglia
two types of nerve cells
basic transmitter of nervous system: axons and dendrites
carry impulses away from cell body of neuron (only one per neuron)
carry impulses toward cell body of neuron (numerous per neuron)
white protein lipid complex surrounding axons
nodes of Ranvier
periodic gaps in myelin along the axon producing faster and more efficient impulse conduction
transport nutrients, wastes, gases among neurons, vascular system and CSF
which one do we have more of: neurons or neuroglial cells?
capable of division: most brain tumors originate from this cell type
phagocytic scavenger cells when nervous tissue is damaged
star shaped: provide nutrients to neurons and form scar tissue if brain is injured
form lining of brain ventricles and central canal of spinal cord
sodium IN, Potassium OUT, impulse is conducted
cell returns to resting state
impulses hop from one node of Ranvier to another: conserves energy
either inhibitory or excitatory: secrete neurotransmitters
microscopic space neurotransmitter has to cross to get from presynaptic terminal to postsynaptic membrane
effector cell or neuron that is the reciever of the neurotransmitter (part of the synapse)
vertebral and internal carotid arteries
two sets of arteries that supply blood to the brain
circle of Willis
name for place where two arterial systems connect at base of brain
middle cerebral artery
principal blood supply of parietal lobe; 90% strokes
no muscle layer or valves: dump blood into venous sinuses
brain cannot store this
confusion will develop
if cerebral glucose drops to less than 70...
coma will develop
if cerebral glucose drops to less than 20
ability of cerebral blood vessels to adjust their diameter to arterial pressure changes within the brain
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