lecture 17 Flashcards
how many neurons in the somatic efferent system
2
what neurotransmitter is used in the somatic efferent system
both synapses use ACh
t/f, both axons in somatic efferent are myelinated
true
the parasympathetic nervous system is also known as what
the rest and digest system
the sympathetic nervous system can also be known as what
the fight or flight nervous system
what are the effectors for the autonomic efferent systems
glands, smooth and cardiac muscle and adipose.
where is the cell body and axon of neuron one for the parasympathetic and sympathetic nervous systems
parasympathetic and sympathetic both have their neuron one cell body in the cerebrum of the CNS and axon in the brainstem or spinal cord.
descirbe neuron 2 in the sympathetic nervous system
short and myelinated, cell body in the n thoracolumbar levels, T1 to L2, short axon which synapses with ACh at the sympathetic chaing ganglion.
descirbe the third neuron in the sympathetic nervous sytem
cell body is found in the sympathetic chain ganglion of the PNS, its long and unmyelinated axon extends out via spinal nerves to the effector cells, this neuromuscular junction uses norepinephrine, NE.
relative to the spinal cord is the sympathetic ganglion close or far away and why
its close and the axon of the 2nd neuron in the sympathetic nervous system is short.
describe neuron 2 of the parasympathetic nervous system
the cell body is found cranial (brainstem) or sacral levels of the spinal cord, so Cranialsacral, the axon is long and myelinated, the axon synapses with the N3 close to the effector cell at parasympathetic ganglion using ACh
describe neuron 3 of the parasympathetic nervous system
the cell body is in parasympathetic ganglia
in or near the effector organs, the axon is short and unmyelinated as its close to the effector cell, the axon synapses on the effector cell using ACh.
why is neuron 3 for the autonomic efferent systems unmyelinated
axon 3 is unmyelinated as the neurons must innervate small muscle cells to gain fine motor control over them. As the axons are so small the lack of myelin doesn’t greatly affect the speed at which action potentials are propagated in these axons,
