Autonomics Flashcards
(32 cards)
What are the components of the autonomic nervous system?
Sympathetic and parasympathetic
At which levels of the spinal cord is the sympathetic nervous system present?
T1-L2
At what levels is the parasympathetic nervous system present?
Cranial nerves as well as S2-S4
Contrast the somatic and autonomic nervous system in terms of the spinal levels at which they are present
Somatic- all levels of the spinal cord
Autonomic- T1-L2 (SNS), cranial nerves for S2-S4(PNS)
Contrast the somatic and autonomic nervous system in terms of the cranial nerves they are comprised of
Somatic- all cranial nerves
Autonomic- cranial nerves 3,7,9 and 10
Compare autonomic and somatic nervous systems in terms of which systems they are present in
Both are present in central nervous system and peripheral nervous system
Contrast autonomic and somatic nervous system in terms of body parts they control
Somatic- body wall and limbs
Autonomic- Viscera, blood vessels and glands
Compare and contrast neuron types in somatic and autonomic nervous system
Sensory(afferent) and motor(efferent)- Somatic
Sympathetic and parasympathetic( both efferent)- Autonomic
In sympathetic innervation to abdominal organs, do preganglionic axons with cellbodies in the lateral horn from T5-L2 enter the chain, do they pass through ganglia without synapsing?
Yes
What happens after preganglionic axons pass through ganglia
Preganglionic fibers/ splachnic nerves leave the medial aspect of the chain ganglia and synapse at a sympathetic ganglion along the abdominal aorta
What is the final step in synaptic innervation to abdominal organic
Postganglionic fibers then travel along arteries to the GI tract
Explain the first part of the parasympathetic innervation
Axons travel from cell bodies in lateral horn like area( S2-S4) to ventral(motor) roots to spinal nerves and then ventral rami of S2, S3 and S4.
Explain the next step of parasympathetic innervation after axons travel to ventral rami of S2-S4.
Axons then jump off the ventral rami as Pelvic splachnic nerves to enter the inferior hypogastric (pelvic) plexus
Where are postganglionic parasympathetic nerves located?
Located at or in the walls of target organs in the pelvis
Describe and give examples of the functions of the sympathetic nervous system
-fight or flight Pupils dilate Increase heart rate Vessel dilation Airway dilation Increased sweating Decrease GIT activity
Describe and give examples of the functions of the parasympathetic nervous system
Rest and digest Salivation Lacrimation Urination Digestion Defecation
Contrast sympathetic and parasympathetic nervous systems in terms of the organs which nerves travel to
Parasympathetic- goes only to internal organs and salivary glands
Sympathetic- Goes everywhere
What is the main control center for the autonomic nervous system?
Hypothalamus
What is the function of visceral sensory neurons?
Send input from the autonomic nervous system to CNS
Contrast the synapse axon pattern of the Sympathetic and parasympathetic nervous system
Sympathetic= short axon, synapse, long axon
Parasympathetic= long axon, synapse, short axon
What can sympathetic neurons possibly synapse through?
Adrenal medulla or autonomic ganglion
What can parasympathetic neurons possibly synapse through?
Autonomic ganglion
Which visceral sensations are conscious?
Those that result in pain
Where are the cell bodies of visceral afferent found?
Dorsal root ganglia of the spinal segment
