ANS 2 Flashcards
What are the 4 option once an axon from the pre-symaptic sympathetic pathway enter the vetebral trunk?
1) Ascend -higher level to synapse, upper organs
2) Descend -lower level to synapse, lower organs
3) Synapse at the level of entry
4) Traverse the trunk WITHOUT synapsing
What does “Traverse the trunk WITHOUT synapsing” mean?
Become part of an abdominopelvic splanchnic nerve or synapse within the suprarenal gland
Postersynaptic sympathetic neuron axons hitch a ride on _________ to reach destination
Nerves/arteries (or anything)
What are the ONLY type of neuron found in sympathetic trunk (IML)? They do what?
Pre-synaptic;Project axons out through anterior root, then mixed spinal nerve into anterior ramus, then they bypass thru white rami into sympathetic trunk
DIFFERENCE BETWEEN SYMPATHETIC TRUNK AND IML?
IML is lateral horn. This is where the cell bodies of the sympathetic neurons are. They then exit through the anterior root, then the mixed spinal nerve, then the anterior rami. They travel in through the white rami to the sympathetic trunk which are the beads on the string made of sympathetic ganglion. They can synapse in those ganglion, or other ganglian, or glands
Anything in the thoracic region will synapse where? Inclusing dermatomes
At the entry level, bc already at correct level (The postsynaptic cell body is going to be within the same ganglian it entered into)
What is the order of movement for POSTsynaptic sympathetic neurons?
sympathetic cell body in paravertebral or prevetebral, ganglia travels through gray matter communicans, EITHER posterior ramus of spinal nerve OR anterior ramus of spinal nerve (innervates body wall, limbs, vaso, sudo, pilo)
Function of postsynaptic SYMpathetic neurons to body wall?
1) Vasomotion 2) Sudomotion 3) Pilomotion
* *Vaso=vessles; sudo= sweat gland; pilo=erectopili of hair follicle muscles
Postsynaptic fibers that exit the sympathetic trunks medially via ____________ are distributed to viscera of the thoracic cavity
Cardiopulmonary splanchnic nerves
What are the abdominopelvic splanchnic nerves?
There are 3: Greater, lesser, and least
What are the 4 parts of the prevertebral ganglia of abdomin? (from superior to inferior)
Celiac ganglia > superior mesenteric ganglion > aorticorenal ganglia > inferior mesenteric ganglion
What are the 3parts of the sympathetic abdominopelvic splanchnic nerves? (from superior to inferior)
Greater, lesser, least (and lumber to pelvic)
What is the exception to the sympathetic pathway synapsing rules? Example?
When the presynaptic neuron goes all the way to the target organ. For surerenal glands (glands). B/c adrenal glands have their own set of neurons within them, so we can synapse on those neurons within the gland itself
How does the suprarenal glands sympathetic pathway differ?
Sympathetic innervation to the suprarenal glands follow the same path as abdominopelvic sympathetic neurons UNTIL the pre-vertebral ganglia, then the neurons pass WITHOUT synapsing to reach the suprarenal gland and synapse on the gland
