ANS Flashcards
ANS consist of
autonomic sensory neurnon, integrative center, autonomic motor neurons, enteric division
location of autonomic sensoru neuron
visceral organs and blood vessel
location of integrating center
CNS
location autonomic motor neurons
propagate from cns to various effector tissues
ANS innervate involuntary or voluntary muscle
involuntary
the visceral afferent and visceral efferent don’t travail together
false
afferent component is sensory or motor
sensory
efferent component is sensory or motor
motor
function of afferent component
autonomie réflexe (blood vessel , change in homeostie) + pain fibers
function of efferent component
regulation of visceral function
in which component there is 2 motor neurons in series
efferent
what does preganglionic fibers of parasympathetic division secrete
Ach
exemple of ANS
celiac plexus, superior mesenteric plexus, inferior mesenteric plexus
ANS is organized into
nerve ganglia plexus
innervation of ANS
involuntarilyinnervates cardiac & smooth muscle, glands of the body
where does ganglia in ANS lie
outside of spinal cord
function of cardiac muscle in ANS
increase or decrease rate/force of contraction
function of gland in ANS
increase or decrease secretion
ANS divided into 2 systems
sympathetic (thoracolumbar) + parasymptathetic (craniosacral)
explain the concept of visceral efferent pathway
They pass through the PREGANGLIONIC NEURON to synapse in the AUTONOMIC ganglion
• They then pass through to the POSTGANGLIONIC NEURON to the EFFECTOR (smooth or cardiac ms/ Glands)
location of neurone in the visceral efferent pathway
lateral grey bodies with some in the anterior horn
where does the synapse occurs
autonomic ganglia
when does the preganglionic neurons changed name
until they synapse with another visceral efferent neurone
what are the 3 location of ganglia
sympathetic trunk
prevertebral ganglion
terminal ganglion
location of sympathetic trunk
above diaphragm on each side of vertebral column
which structure btw the 3 location of ganglia has impacted on structure below diaphragm
prevertebral ganglion
which 2 ganglia is in the sympathetic division
sympathetic trunk and prevertebral ganglion
location of prevertebral ganglia
T1-L2 , anterior of large abdominal arteries
location of terminal gangilia
within or very close to effector that they are about to innervate
where did the prevertebral ganglion take their name + exemple
from the large abdominal a.
- > celiac ganglion (celiac artery)
- > sup/inf mesenteric ganglion ( sup/inf mesenteric artery)
tje sympathetic trunk and prevertebral ganglia receive their preganglionic fiber from ?
thoracolumbar sympathetic division
terminal ganglion receive preganglionic fibers directly from
craniosacral parasympathetic division
all ganglia of terminal ganglion receive what
preganglionic neurons/fibers
location of preganglionic fiber to their cell bodies
lateral grey horn of spinal cord
pathway of autonomic efferent fibers
The Autonomic Efferent Fibers leave by the ventral root of the spinal nerve accompanying the Somatic Efferent Fibers
what are the spinal segment involved in the sympathetic division and the name
TI-T2,L1,L2
thoracolumbar division
what does the sympathetic trunk division influence
organ above diaphragm
what does the prevertebral ganglion (celiac ganglion) influence
structure below diaphragm
where does the preganglionic fiber sympathetic trunk enter
white rami communicant from ventral rams of spinal cord
where does the postganglionic fibers of sympathetic trunk enter the ventral rami of spinal nerve
grey rami communicant
what are the name of the presynaptic nerve in the prevertebral ganglia + location
splanchnic nerve
below diaphragm
presynaptic neurone may synapse with only one postsynaptic neuron in the sympathetic division
false with as many as 20 postsynaptic neurons
which division have a wide spread effect on the body
sympathetic response
other name of the celiac plexus
solar plexus
what is comprised in the celiac plexus
paired celiac ganglia, sup mesenteric ganglia, smaller ganglia
location of celiac plexus
anterior aorta at the origin of celiac artery
location of preganglionic cell Bodie go parasympathetic division
lateral grey horn and nuclei of cranial nerve III,VII,IX,X
from where are the pregranglionic fibers of parasympathetic division
cranial nerve 3,4,9,10 and corresponding ventral root of spinal nerve S2-S4
name of the terminal intramural ganglion division
craniosacral division
what is release by the postganglionic fibers in sympathetic division and name of fibers
norepinephrine
adrenergic fibers
function of sympathetic division
- increase activity of organ
- prepare individual for emergency situation
- increase heart rate, aggression, adreanile production
- increase blood flow to skeletal and cardiac muscle (vasodilation)
- vasoconstriction of non essential organ
name of fibers of sympathetic division
adrenergic fibers
what is the exception in the sympathetic division
sweat glands release ach
what does postganglionic fibers relates in parasympathetic division
acethylcoline
function of parasympathetic division
- decreacse activity
- maintain organ level of activity to pressure
- homeostasis
- dominant in non-stressful situation
is the sympathetic and parasympathetic division always working together
yes because they cause opposite response
