Autonomous Nervous System Flashcards
Where does smooth muscle come from?
From the splanchnic/visceral layer of lateral mesoderm.
What is the main difference between the somatic and the autonomous nervous system?
Somatic - 1 motor nueron
Autonomic - 2 motor neurons
Where are sympathetic preganglionic visceromotor nuerons located?
At the lateral horn / intermediolateral.
T1 to L2
In lenght how are the preganglionic and postganglionic fibers in the sympathetic system?
Preganglionic fibers are short
Postganglionic are long.
What is the motto of the sympathetic system?
Fight or Flight
What does the sympathetic trunk/chain innervate?
The dermis (sweat glands, arrector pili muscle and blood vessels) and the Thoracic visera (lungs, heart…).
What does the preaortic single ganglia innervate?
The abdominal and pelvic cavities.
What is innervated ONLY by the sympathetic smooth muscle?
The dermal smooth muscle (blood vessels, arrector pili muscle and sweat glands).
With what type of nerves go the sympathetic nerves that are going to innervate the smooth muscle?
With the spinal nerves.
What do the postganglionic fibers that innervate the Thoracic Viscera form?
The Cardiac Nerves
What type of nerves form the preganglionic nerves that innervate the abdominal cavities?
Splanchnic Nerves
In lenght how are the preganglionic and postganglionic fibers in the parasympathetic system?
Preganglionic fibers are long.
Postganglionic fibers are short.
What do the nerves of the parasympathetic system from the brainstem innervate?
The thoracic and abdominal viscera (2/3 of TC).
What do the the nerves of the parasympathetic system from S2-S4 innervate?
The rest of the GI tract and the pelvic viscera.
With what fibers does pain travel with?
With sympathetic fibers and reach the CNS first through the white communicating rami and then through the dorsal root (propia de las sensory fibers).
