Enteric Nervous System Flashcards
What nervous systems affect the gut?
autonomic and enteric nervous systems
How do the branches of the ANS affect the gut?
PNS - inhibits gut immune system
SNS - activates gut immune system
What nerve controls the gut through the PNS? How does it control the gut?
Vagus nerve - stimulates peristalsis (movement of food) and secretion of digestive hormones
What nerve controls the gut through the SNS? how does it control the gut?
prevertebral ganglia of celiac, superior and inferior mesenteric - inhibit peristalsis and secretion of digestive hormones
What are the types of nerves in the enteric ns?
- IPANS = intrinsic (necessary) afferent sensory neurons
- motor efferent neurons
- interneurons
What direction can enteric sensory afferent neurons go?
from GI tract through interneurons to brain or to enteric motor neurons
What are the two types of enteric sensory neurons?
visceral sensory nerve fibers and spinal visceral nerves
Visceral sensory nerve fibers
in vagus nerve and sacral nerve, transmit sensory info from gut to nucleus tractus solitarius in brain stem
spinal visceral nerves
transmit information from mechanical stimuli to cell bodies in spinal cord
What type of stimuli does enteric sensory nerves report on?
mechanical and chemical
What are the two pathways to get to enteric motor neurons?
brain to ANS motor neurons to enteric motor
enteric sensory to enteric motor
What stimuli does the enteric motor neurons report on?
peristalsis and churning of intestinal contents
What are interneurons?
found in ens plexus, they carry messages between ens motor and sensory neurons
What are the enteric plexus regions?
submucosal (meissner’s) plexus and myenteric (auerbach’s) plexus
submucosal (meissner’s) plexus
stimulates secretions in submucosal layer of the gut
