Flashcards in Autonomic Nervous System (ANS) Deck (37):
What do the sensory neurons convey info from?
from the interoceptors such as chemoreceptors and mechanoreceptors to the integrating center in the CNS
Which type of muscle do the motor units not relay impulse to (ANS)?
What's the difference between ANS and SNS regarding neuron pathways?
ANS has two motor neurons: preganglionic and postganglionic. Whereas SNS, the motor axon goes from the CNS directly to the skeletal muscle.
Explain a preganglionic neuron.
Cell bodies within the CNS (in lateral grey horns (sympathetic...) of spinal cord and in the nuclei of cranial nerves III, VII, IX, X (parasympathetic...)
From CNS to autonomic ganglion
Explain postganglionic neuron.
Within the autonomic ganglion.
From ganglion directly to effector.
Does the ANS work with or without conscious control?
Usually without conscious control.
What is the enteric division?
A specialized network of nerves and ganglia in the GI tract (ANS)
Where are the visceral afferent neurons located?
in the dorsal root ganglia of the spinal nerves
Where are the visceral efferent neurons located?
Mainly in the lateral grey bodies with some in the anterior horn.
Where does the synapse between pre and post-ganglion happen?
What are the 3 types of ganglia?
1 - Sympathetic trunk (sympathetic)
2 - Prevertebral ganglion (sympathetic)
3 - Terminal (intramural) ganglion (parasympathetic)
Where is the sympathetic trunk located?
Closely on each side of the vertebral column
Where are the prevertebral (collateral) ganglion found?
Found anterior to the large abdominal arteries.
Like the, 1)celiac ganglion
2)Superior mesenteric ganglia
3)Inferior mesenteric ganglia
Which 2 receive their preganglionic fibers from the thoracolumbar (sympathetic) division?
sympathetic trunk and prevertebral ganglia
T1-T12, L1, L2
Where are the terminal (intramusal) ganglion located?
Very close to or in the visceral effectors (smooth/cardiac muscle/glands/organs)
Where does the terminal (intramusal) ganglion receive their preganglionic fibers?
Directly from the craniosacral (parasympathetic) division of ANS FROM CIII, CVII, CIX, S2-S4
All ganglia receive preganglionic neurons except for...
the greater splanchnic nerve that stimulates the adrenal gland
Craniosacral is (parasympathetic/sympathetic).
Thoracolumbar is (parasympathetic/sympathetic).
Craniosacral - parasympathetic
Thoracolumbar - sympathetic
The spinal segments involved in the sympathetic divisions are?
T1-T12, L1, L2
The preganglionic fibers enter the sympathetic chain via the?
after synapsing, the postganglionic fibers enter the ventral rami, by way of the (grey/white) rami commissures.
Do all presynaptic (sympathetic) fibers synapse in the sympathetic trunk?
What are presynaptic nerves called?
Where are the splanchnic nerves found?
One presynaptic neuron may synapse with as many as _____ post synaptic neurons.
The greater splanchnic nerve stimulates the adrenal gland (directly/indirectly).
What is the celiac plexus made up of?
Comprised of celiac ganglia, superior mesenteric ganglia, and other small ganglia.
Where does the celiac plexus lie?
On the anterior aorta at the origin of the celiac artery
Whats the other word for celiac plexus?
Difference in para and sympathetic regarding preganglionic cell bodies and where they are found.
Symp - lateral grey horns
Para - lateral grey horns and in the nuclei of cranial nerves III, VII, IX, X
All presynaptic (parasympathetic) neurons synapse in the?
terminal (intramusal) ganglia
What do ciliary ganglia innervate?
Smooth muscle of the eye
What do pterygopalatine, otic, and submandibular ganglia do?
Send postganglionic axons to many glands and to the mucosa of the face.
What do postganglionic fibers release in the sympathetic division? WHY?
Norepinephrine; this will increase activities of the organs.
Post ganglionic fibers (sympathetic) are also called?
What do postganglionic fibers release in the parasympathetic division? WHY?
acetylcholine; decrease activity