From esophagus to anus: 4 concentric layers or tunics
Alimentary Canal:
Esophagus:
Propels food from pharynx to stomachPosterior to trachea & heart
Mucosa:
Submucosa:
Muscularis Externa:
Adventitia:
Esophagus:
Passes from thorax to abdomen through diaphragm, enters stomach (left of midline).
Stomach:
Storage: Highly distensible Delivers slowly to duodenum Secretion of mucous, hydrochloric acid Secretion of enzyme - Digestion of proteins Secretion of enzyme - Digestion of lipids Secretion of enzyme - Absorption of B12
Stomach:
Stomach:
Small Intestine: Total length: 6 to 7 metersDiameter: 2.5 to 3 centimeters
Small Intestine:
Duodenum
Jejunum
Ileum
Small Intestine:
DUODENUM: Receives Secretes
JEJUNUM:
ILEUM:
Small Intestine:
Small Intestine:
Mucosa specialized three ways to increase surface area for absorption
Large Intestine (colon):
From ileocecal junction to anus~ 2 meters long~ 5 to 8 cm diameter