NERVES Flashcards
Postural Reflex
Stretch Reflex
Spasticity is defined as ?
Hyper-Responsive Stretch Reflex
Spasticity is a _________________ state that does what?
it is a hypertonus state of the affected muscles due to a releases of the tonic inhibition of the brain stem, facilitatory info which leads to gamma motor neuron excitation. Thus hyperactivity of the gamma fibers.
Where does this arise in the spinal cord sympathetic preganglionic cervical ganglion (SCG)?
T1-T8
where are the cell bodies of the preganglionic sympathetic nerves that innervate the head?
intermediolateral horn of spine (T1-L2)
Norepinephrine is a __________________
Post-synaptic sympathetic NT
What neurotransmitter is found in nerves that transfer pain?
Substance P
What is endomysioum and endonerium?
Endomysioum: areolar CT around each muscle FIBER
Endonerium: CT around myelin sheath/ neuron axon
CNS myelin sheath formed by what?
Oligodendrocytes
What is PNS myelin formed by?
Schwann cells
An impulse can travel from one nerve to another in one direction because?
because the synapse limits the direction of travel
Absolute refractory period is by?
NA channel inactivation
What solute affects membrane resting potential?
K+
Na+-K+ pump is an example of what type of transport?
Active transport
Resting potential is -70mV & extracellular K+ increase & comes out of nowhere?
no change
