Grand Tour of Alimentary Canal Flashcards
What are the four functions of the digestive system
Digestion
Secretion
Absorption
Motility
What are the four layers of membranes
Mucosa, Submucosa , Muscularis Externa, Serosa ( Below DIaphragm), Adventitia (Above diaphragm)
What are the three layers of mucosa
epithelium, lamina propria,muscularis mucosae
what are the myenteric and submucosal plexuses called
Intramural Plexus
What structures have stratified squamous epithelium
Mouth, Oesophagus and anal canal
What structures have simple columnar epithelium
Stomach, small and large intestine
What does the epithelium synthesis and secrete
Digestive enzymes,mucus,hormones
What does the Lamina Propria contain
glands,blood and lymph vessels
Muscularis mucosae function?
Thin smooth muscle layers
Submucosa contains nerves and an extensive neural network called:
Submucosal plexus
Where are submucosal glands found
oesophagus and duodenum
What is the muscularis externa made of
Inner layer ( circular muscle Outer layer (Longitudinal muscle) -Produces motility, peristalsis,segmentation
What is found bw circular and longitudinal muscle
Myenteric plexus
What do submucosal + Myenteric plexuses form?
Enteric nervous system (ENS)
What autonomic control does the GI system have
Long (parasympathetic) and short (ENS) reflexes
What parasympathetic control does the GI syste have
Vagus nerve ( Cranial nerve X) Except salivation which is controlled by Facial (VII) and glossopharyngeal (IX) nerves
Sympathetic system controlled by?
Splanchic nerve.
-Controls salivation but of a different consistency
Coeliac trunk supplies:
Stomach,Small intestine, pancreas, Liver
Superior mesenteric artery supplies:
Small Intestine, Caecum, Ascending colon, Transverse colon
Inferior mesenteric artery supplies:
Descending colon, Sigmoid colon, Rectum
Hepatic portal vein forms by:
Junction of splenic vein and superior mesenteric vein
