GI Part 7- 1 Flashcards
What control system is located in the wall of the GI tract- enteric nervous system, GI hormones?
Intrinsic
What GI control system is located outside- vagus and splanchnic nerves, non-GI hormones?
Extrinsic control system
What nervous system is a components of the autonomic nervous system, located within the GI wall and enables autonomic regulation of GI functions?
Enteric nervous system
What is located between submucosa and circular musculature, regulated mucus secretion and food absorption?
Plexus submucosa (Meissners)
What is located in the muscularis externa, between longitudinal and circular musculature, control of muscular activity?
Plexus myentericus (Auerbachs)
Unlike typical neurons, enteric neurons secrete their neurotransmitter from __________ located on often lengthy axonal collaterals on branches —> an enteric merino affects a wider area compared to the typical CNS neuron
Varicosities
What type of cells:
Detect changes/stimuli and regulate function
Axons go to other enteric nerve cells and to the CNS
Sensory nerve
What cells recognize stretching of intestinal wall or volume changes and induce a response?
Mechanosensitive cells
What cells detect intraluminal pressure and respond to gastric phase of gastric acid secretion?
Mechanosensitive
What detect the presence of nutrients in the GI lumen, changes in the osmolarity, and changes in the pH and induce a response?
Chemosensitive cells
What cells are:
Sensibilization of enteroendocrine cells
Chemosensitive cells
The process signals coming from other nerve cells or from the CNS and propagate them to other neurons (motor neurons)?
Interneurons
What neurons induce a change in the GI tract in response to a stimulus?
Motor neurons
What motor neurons are:
Primary located in plexus myentericus
Muscle
What motor neurons are:
Primary located in plexus submucosus
Secreto
