Terms in this set (13)
Identify factors influencing conducting velocity in neurons.
diameter and temp will effect speed of action potential
as the diameter of the axon increases, the conduction speed will be greater bc less ions will leak from the channel
higher the temp the higher the conductance
myelin sheath acts as an electrical insulator where the action potential travels from one node of ranvier to the next by saltatory conduction
How do local anesthetics block pain signals?
Such as Novocain, block nerve transmission to pain centers in the central nervous system by binding to and inhibiting the function of an ion channel in the cell membrane of nerve cells known as the sodium channel
This protein folds into a cylindrical shape with a central channel that can be opened and closed in response to voltage signals from the nerve cell. The local anaesthetic works by moving to the inside of the cell then binding to the 'sodium channel' and so blocking the influx of sodium ions. This block stops nerve conductance and prevents further signals reaching the brain.
What is the rate limiting step in neural signaling?
is the rate-limiting (slowest) step of neural transmission. Helps explain why transmission along neural pathways involving only two or three neurons occurs rapidly, but transmission along multisynaptic pathways typical of higher mental functioning occurs much more slowly.
Of what does gram matter consist in the central nervous system?
Grey matter (or gray matter) is a major component of the central nervous system, consisting of neuronal cell bodies, neuropil (dendrites and myelinated as well as unmyelinated axons), glial cells (astrocytes and oligodendrocytes), synapses, and capillaries.
Which part of the brain is the "executive suite"
The cerebral cortex is the "executive suite" of the nervous system, where most of our higher-level decision making occurs.
In general, anterior structures in the cerebrum are motor / sensory (circle one underlined term).
Fibers from the cerebrum are _______________ to the side of the body they control and fibers from the cerebellum are ____________________ to the side they control.
The ___________ connects the third and fourth ventricls in the brain.
They pyramids ___________ in the medulla oblongata.
The two pyramids contain the motor fibers that pass from the brain to the medulla oblongata and spinal cord. These are the corticobulbar and corticospinal fibers that make up the pyramidal tracts.
Nucleus gracilis / cuneatus (circle one underlined term) relays sendory / motor (circle one) information from the lower body.
Identify three factors in transfer of information from short term memory to long term memory.
Identify one function of the meninges.
protect the central nervous system. The pia mater is the meningeal envelope that firmly adheres to the surface of the brain and spinal cord.
What is a dermatome and why is it helpful to neurologists?
Dermatome maps are useful in enabling the clinician to determine the level of a lesion of the spinal cord or nerve roots by examining the sensory function on patients with neurological disorders.
indicate potential damage to one or more spinal nerves.
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