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discuss the fxns and features of the autonomic nervous system:
- fxns: motor nervous system, adjust activity of glands, cardiac, and smooth muscle ( viscera, blood vessels, and sweat glands)
- features: involuntary/ unconscious, two divisons (sympathetic/parasympathetic), enteric (GI tract), visceral reflexs, self governed
Summerzie the structural and fxnal differences b/w the ANS and the somatic nervous system with respect to motor pathways, ganglia, effector (target) organs, and NT
- skeletal muscles, spinal cord
- neurons: long, myelinated axon
- Autonomicsmooth muscle
- neurons: synpase in ganglion, 1st neuron is preganglion fiber, ACh exciatory stimulate, 2nd neuron is postganglion fiber, unmyelinated and can be excitatory or inhibitory
describe the PSNS of the ANS based on its origin in the CNS, fxn, extent and duration of its effects, location and lenght of its ganglionic fibers, and types of NT and receptors at ganglionic synpases:
- origin: crainosacral (brainstem, s2-s4)
- fxn: rest and digest, decreased heart rate, increased digestion/waste elimination, claming effect, maintain normal body maintance
- duration: short lived
- extent: selective
- location of ganglion: near target organ
- length of ganglion: long preganglionic, short postganglioic fibers
- NTs: chloinergic, ACh
- NT receptors: nicotinic (nAchR) always excitable , muscarinic (mAchR) inhibitatory (heart) or excitatory (smooth muscle)
describe the SNS of the ANS based on its origin in the CNS, fxn, extent and duration of its effects, location and lenght of its ganglionic fibers, and types of NT and receptors at ganglionic synpases
- origin: thoracolumbar (t1-L2)
- fxn: aleartness, increased HR, BP, airflow, glucose, increased blood flow to heart/skeletal muscles, decreased bloodflow to GI tract, flight or fight
- extent: widespread
- duration: long lasting
- location of ganglion: near vertebral column
- length of ganglion: short preganglion, long postganglion
- NTs: ACh (preganglion), Norepiephrine (postganglion), andenergic (E/NE)
- NT receptors: excitatory, inhibitory, A1,A2, B1, B2
which division of the ANS has short preganglionic fibers:
what NT are involved in the SNS?
- both are secreted into the blood
which division of the ANS is more selective in its effects?
PSNS - short postganglionic fibers
which divison of the ANS has long preganglionic fibers?
what CN (and #) makes up the majority of all PSNS fibers?
X vagus nerve
what vertebrae are involved in the SNS?
thoracolumbar T1 - L2
what part of the brain is involved in the PSNS?
what are the 3 possible routes that SNS pathways can take? what is an example of each?
- 1. synapse and exit: skin, vessles, muscles
- 2. up/down spinal cord and exit: head, thoracic cavity
- 3. synapse at collateral ganglion and exit: pelvic, abdominals
which division of the ANS has more synpases?
what is the normal balance between the SNS and PSNS called?
which division of the ANS will be activated if :
a. a dog bears its teeth at you
b. if you smell your mom cooking turkey and stuffing
c. if you get into a car accident
d. if you dont eat for a full 24 hrs.
- a. SNS
- b. PSNS
- c. SNS
- d. PSNS