Autonomic Nervous System Flashcards
What does the autonomic nervous system divide into?
Sympathetic and Parasympathetic
What does the somatic nervous system divide into?
Sensory (afferent) & Motor (efferent)
What does the CNS develop from?
Neural tube
Where does the PNS develop from?
Develop from neural crest and CNS outgrowths
Receives information from and responds to external world
Somatic
Innervates structures that develop from somites
Somatic (Body)
Innervates organ systems & its elements
Visceral (Organs)
Detects and responds to information within body
Visceral (Organs)
What nervous system is excitatory?
Somatic
Stimulation of the axon/nerve results in the activation of a particular action
Somatic NS
Concerned with conscious sensation and response usually via striated muscle and contains parts of the CNS and PNS
Somatic NS
Provides sensory and motor innervation to all parts of the body except: viscera, smooth and cardiac muscle, & glands.
Somatic NS
Our autonomic NS and in generally concerned with sensations of our internal body and actions via smooth muscles and glands
Visceral NS
Provides efferent involuntary motor innervation to smooth muscle, the conducting system of the heart, and glands
Visceral NS
Provides afferent sensory innervation from the viscera (pain and autonomic reflexes)
Visceral NS
Can be excitatory of inhibitory when stimulated
ANS
Group of cell bodies in CNS
Nucleus
Group of cell bodies in PNS
Ganglion
Glia in CNS
Astrocyte
Oligodendroglia
Microglia
Glia in PNS
Schwann cell
Another name for schwann cell
Neurilemmal cell
Visceral portion of the NS which has sensory or afferent fibers
Autonomic NS
Monitors changes to the viscera. Arise from the neural crest
General Visceral Afferent
2 neuron chain
General Visceral efferent
What spinal levels are sympathetic?
T1-L2 (3)
Supply/innervate peripheral glands, smooth muscle and other viscera
Sympathetic
What is parasympathetic associated with?
Cranial nerves (III, VII, IX, &X) S2-S4
Supply and innervate peripheral viscera
Parasympathetic
Neurons in the walls of the alimentary canal controlling motility (contractions of the gut wall), exocrine and endocrine secretions, & blood flow thru the gastrointestinal tract, it also regulates immunological and inflammatory processes.
Enteric
What connections are between the enteric system and the CNS
Parasympathetic and sympathetic
Paravertebral sympathetic trunk
Sympathetic chain
Para-aortic ganglia, abdomen and pelvic
Pre-vertebral ganglia
Preganglionic cells of sympathetic
T1-L2 (thoracolumbar)
Postganglionic sympathetic
- Sympathetic chain
- Prevertebral chain ganglia via splanchnic nn
Pre ganglionic cells of parasympathetic
CNs
S2-S4
Craniosacral
Postganglionic parasympathetic
4 cranial ganglia
Ganglia with organs
Name the collateral ganglia pairs/ prevertebral ganglia
- Celiac
- Superior mesenteric
- Aorticorenal
- Inferior mesenteric
- Ascend then synapse
- Synapse at level of exit
- Descend then synapse
- Pass through without synapsing
4 options once presynaptic fiber enters the chain
- Innervation of the head
- Cervical cardiopulmonary splanchnic nerves
- Spinal nerves to neck, upper trunk & upper limb
Ascend then synapse
- Thoracic cardiopulmonary splanchnic nerves
- Spinal nerves to middle trunk
Synapse at level of exit
Spinal nerves to lower trunk & lower limb
Descend then synapse
Innervation of abdominopelvic viscera
Pass through without synapsing
Somatic innervation
Sacral plexus
Sympathetic and parasympathetic innervation
Autonomic plexuses
What fibers does the hypogastric plexus contain?
Sympathetic and parasympathetic
What does the hypogastric plexus cover?
Birfucation of aorta and upper sacrum
Where are sympathetic post ganglionic cell bodies found?
- Sympathetic chain
- Collateral ganglia
Example of collateral ganglia
- Superior meseteric
- Celiac
- Inferior Mesenteric
- Aoritcorenal
Where are chromaffin cells found?
Adrenal medulla
Modification of post synaptic sympathetic cell
Chromaffin cell
Where are sympathetic preganglionic cell bodies found in what regon
Lateral horn or intermedial cell column
How do prevertebral ganglia arrive?
Via splanchnic nerve
Where are postganglioic cell body location?
Prevertebral plexus
What joins to make spinal nerve?
Dorsal and ventral root
What does spinal nerve divide into?
Dorsal and ventral ramus
White ramus
Preganglionic sympathetic
Grey ramus
Post ganglionic sympathetic
What are the levels that sympathetics can synapse
C2-C8
T1-L2
L3-Co
Pass through chain without synapsing
Splanchnic nerves
Superior mesenteric
Midgut
Inferior mesenteric
hindgut
T5-T9, goes to celiac ganglion
T5-T9, goes to celiac ganglionGreater splanchnic nerve
T10-11, goes to superior meseteric
Lesser Splanchnic nerve
T12, goes to Aorticorenal
Least splanchnic nerve
Where do lumbar splanchnics go?
IMA
What do sacral splanchnic serve
Pelvic viscera
What cranial nerves are associated with parasympathetic?
III, VII, IX, X
Descends and addresses parasympathetics all the way to the proximal 2/3 of the transverse colon
Vagus
Distal extent of parasympathetic innervation
proximal 2/3 of the transverse colon
Come together to form the hypogastric plexus
Lumbar and sacral splanchnics
Where does chain ganglia begin to move from lateral to medial?
Sacral promentories
Where do sympathetic trunks join?
Ganglion impar
Where is the prominent sacral splanchnic nerve which contributes directly to hypogastric plexus?
S2 & S3
Where do pelvic splanchnic come from?
Ventral ramus
Where does sacral splanchnic come from?
Sympathetic chain ganglion
Nervous system that is apart of the intestinal tract
Enteric NS
Large cells, prominent nuclei, surrounded by a number of schwann cells
Submucosa plexus
Meissner’s plexus
How can you identify submucosa plexus?
Surrounded by dense irregular CT
Plexus that is located between smooth muscle layers (Circular and longitudinal)
Myenteric Plexus (Auerbach’s plexus)
What provides parasympathetic innervation to the hindgut?
Pelvic splanchnic (Superior hypogastric)
Do sacral splanchnic come off of grey rami?
No, they come off directly
Provides parasympathetic innervation to hindgut
Superior hypogastric
Provides parasympathetic innervation to pelvic viscera
Inferior hypogastric
Do kidneys get parasympathetic innervation?
No