Gastrointestinal Tract Flashcards
The stomach enters into
duodenum
Innervation of the stomach(sympathetic, parasympathetic, sensation: reflex and pain)
Vagus nerve (parasympathetic)
Thoracic sympathetic trunk T5-T9 (sympathetic)
Sensation: unconscious/reflex(vagus)
Pain (sympathetic)
Stomach blood supply
Celiac trunk via L/R gastric arteries, L/R gastro-omental arteries
Duodenum arises from
Pylorus
Duodenum enters
Jejunum
Duodenum function
Site of additional digestion from products of liver/pancreas, initiate nutrient absorption
Duodenum blood supply
Celiac trunk via gastroduodenal artery, additional supply from superior mesenteric artery
Duodenal innervation: Parasympathetic, sympathetic, and sensation pathways
vagus nerve (parasympathetic); thoracic sympathetic trunk T5-T9 (sympathetic), sensation pathways: unconcious/reflex (vagus) pain (sympathetic)
Jejunum function
Absorption of nutrients
Jejunum arises from
Duodenum
Jejunum enters
Ileum
Jejunum blood supply
Superior mesenteric artery via intestinal arteries
Jejunum innervation: Parasympathetic, sympathetic, and sensation pathways
vagus nerve (parasympathetic); thoracic sympathetic trunk T8-T10 (sympathetic)
sensation pathways: unconcious/reflex (vagus)
pain (sympathetic)
Ileum arises from
Jejunum
Ileum enters into
Cecum
Ileum blood supply
superior mesenteric artery via intestinal arteries, Ileocolic artery
Ileum innervation: Parasympathetic, sympathetic, and sensation pathways
vagus nerve (parasympathetic) thoracic sympathetic trunk T8-T10 (sympathetic)
sensation pathways: unconcious/reflex (vagus) pain (sympathetic)
What is the ileocecal valve?
Muscular valve at the junction of ileum and cecum
Ileocecal valve function
Regulates passage of digestion from ileum to cecum (between small and large intestines)
Cecum function
Absorption of water, concentration of feces
The cecum arises from
ileum
The cecum enters
The ascending colon
Cecum blood supply
Superior mesenteric artery via ileocolic artery