lec 1 GI Reflexes Flashcards
Gastrointestinal Reflexes
- Local Reflexes
- Regional Reflexes
- Systemic Reflexes
Local Reflexes
- entirely within the gut wall ENS
2.control: secretion,
peristalsis,
mixing contractions,
local inhibitory effects
Regional Reflexes
from the gut ► the pre-vertebral sympathetic ganglia ►back to the gastrointestinal tract
2. long distances
Regional Reflexes example
- gastro-colic reflex
- the entero-gastric reflexes
- the colono-ileal reflex r
gastro-colic reflex
Regional Reflexes from the stomach to cause evacuation of the colon,
the entero-gastric reflexes
Regional Reflexes from the colon and small intestine to inhibit stomach
motility and stomach secretion
the colono-ileal reflex
Regional Reflexes from the colon to inhibit emptying of ileal contents into the
colon
Systemic Reflexes:
from the gut ► the spinal cord or brain stem ► then back to the
gastrointestinal tract
Systemic Reflexes include
- Vagovagal reflex
- pain reflexes
- defecation reflexes
Vagovagal reflex
Systemic Reflexes
from the stomach and duodenum brain stem back to the stomach—by way of the vagus nerves (vagus do have afferent sensory and efferent motor) to control gastric motor and secretory activity;
pain reflexes
Systemic Reflexes
inhibition of the entire GIT
defecation reflexes
Systemic Reflexes
travel from the colon and rectum spinal cord produce the powerful colonic, rectal, and abdominal contractions required for defecation (the defecation
reflexes