Autonomic Nervous System Flashcards
What ans is
Autonomous system of involuntary control if vital functions for life
Regulated by hypothalamus
Autonomic nervous system divided into
Enteric- digestion
Sympathetic- fight/flight
Parasympathetic- calm:regroup
How ANS works
Sensory input and motor output to visceral organs, glands
Using an extra ganglion (dig from direct ganglion)
Which is a group of nerve cell
Ganglion in ANS
Call then peripheral(or autonomic) ganglia (not the same as the dorsal root ganglia)
What does ANS regulate
Heart Lungs Blood vessels Digestive organs Reproductive organs Urigenital system
And regulate through
Involuntary control
Not conscious
Does it’s own thing
What ANS do
Maintain homeostasis - can’t always be panicked or calm
Promote survival in times of extreme anxiety, stress
3 sub divisions of ANS (within the pns)
Enteric
Sympathetic
Parasympathetic
Enteric
Works in conjunction with CNS
Muscle movement to help digestion
Sympa and para work in tandem
Complimenting each other’s function
To maintain homeostasis
Sympathetic
Fight/flight
Spends energy
Para
Rest/restore
Conserved energy
Enteric comprised of
Sensory, motor, and interneurons
Comprehend if millions of neurons
Outside cns system with most neurons
Enteric Innervate
Smooth muscle of GI system
Located in walls of stomach, esophagus, small intestine, pancreas, gall bladder, colon
How enteric function
Can function as it’s own circuit via the ANS
Can also interact with cns to relay pain, discomfort
Enteric is capable of
Detection of muscle tension
Relaxation and/or contraction of muscle tension and peristalsis
Secretion of enzymes for digestion
Regulation of fluid secretion between gut as other tissue
Sympathetic functions
Acceleration/altering system
Fight/flight
Engages/prepares body to respond
Almost always excitatory
What sympathetic does
Accelerates heart rate Constrict blood vessels Elevate BP Redistribute blood to brain, heart Dilate pupils Dilates bronchial passages Decrease peristalsis Closes sphincters
Sympathetic activated by
Posterior/lateral hypothalamus
Norepinephrine
Parasympathetic functions
Rest/recover
Mostly inhibitory pathway
Down-regulate function
Parasympathetic does what
Restore visceral bodily function After sympathetic activation Restore homeostasis Dominant during sleep and relaxation Decrease heart rate Normal respiration Increase peristalsis pens sphincters
Para activated by
Hypothalamus
Actylcholine as an inhibitor
Para and sympa
Work in balance to maintain survival expenditure energy when necessary and conserving energy when required
Most organs are Innervate by both para and sympa but some only one
Sympathetic- sweat glands, hair follicles, kidneys, blood vessels
Para- lacrimal tear gland
Sympa
Extra peripheral ganglia close to spinal column Innervate up to 20 different glands muscles and organs
Para
Extra ganglia faryer away from cns and extra ganglia Innervate 1-3 glands
Not immediate
Only coming out if top of cns brainstem or vey bottom
