Nervous System Histology
They provide protection for the brain and spinal cord
What is microglia?
A change in membrane potential from –70mV to –40mV is termed this
What is depolarization?
The space between the presynaptic and postsynaptic membranes
What is synaptic cleft?
A functional class or neurotransmitters that is contains a slight depolarization the cell to promote an action potential
What is excitatory?
The two sets of nerves found in the PNS
What is spinal and cranial nerves?
Chromatophilic substance is found here
What are neuronal cell bodies?
At rest, a cell will have more ______ ions in the cytoplasm than outside the cell
What s potassium?
The presynaptic neuron releases neurotransmitters in response to an influx of these ions
What is calcium?
The natural opiates of our body
What are endorphins?
A class of neuron that is rare in the human body and found in some special sensory organs
What is bipolar?
Terminal arborizations are found here
What are neuronal axons?
During membrane repolarization, there is a decrease in the membrane permeability to this ion
What is sodium?
Inhibitory postsynaptic potentials cause the postsynaptic membrane to become more permeable to this
What is potassium?
A neuronal circuit where incoming information is spread around or amplified
What is diverging?
Myelin sheath gaps (nodes of Ranvier) are found here
What are myelinated axons?
Myelin sheaths in the CNS are produced by this
What are oligodendrocytes?
A membrane maintains its resting potential mainly because of this
What is the sodium-potassium pump?
This occurs when a neuron is stimulated by more than one terminal
What is spatial summation?
Neuronal circuits involved in rhythmic activities such as breathing and arm swinging
What is reverberating?
The neurilemma is found on these
What are axons of the PNS?
Neuroglial cells that line the ventricles of the brain are these
What are ependymal cells?
In multiple sclerosis, periods of remission are thought to be due to this
What is the sponataneous appearance of Na+ channels?
A transient hyperpolarizations of the postsynaptic membrane potential that decrease the likelihood of neuron firing
What is inhibitory postsynaptic potential (IPSP)?
Dopamine and serotonin are examples of these class of neurotransmitters
What is biogenic amines?
These areas focuses the strength of action potentials to localized areas on a myelinated nerve
What is nodes of Ranvier?