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Digestive System

Embryology Exam 4

What forms the primitive gut? tube of endoderm
When and how is the primitive gut formed? Formed week 4 by lateral, cranial and caudal folding
What are the 4 divisions of the primitive gut? "Please Forgive My House" Pharynx, Foregut, Midgut, Hindgut
The Pharynx of the primitive gut is located where? Buccopharyngeal membrane to tracheobronchial diverticulum
The Foregut of the primitive gut is located where? Pharynx to entrance of bile duct into duodenum.
The Midgut of the primitive gut is located where? From the Duodenum distal to entrance of the bile duct to proximal 2/3 of the transverse colon.
The Hindgut of the primitive gut is located where? Distal 1/3 of the transverse colon to the cloacal membrane.
The endoderm is the germ layer for what? Epithelial lining and glands of mucosa; parenchyma of digestive glands.
Splanchnic Mesoderm is the germ layer for what? Supporting structures including muscular walls and peritoneum.
What is the Arterial Supply of the Foregut, Midgut, and Hindgut? Foregut - celiac a. Midgut - superior mesenteric a. Hindgut - inferior mesenteric a.
What does the Primitive Foregut form? Esophagus, Stomach, Duodenum, Liver, Gall bladder, and Pancreas.
What separates digestive and respiratory tubes in the esophagus? Esophagotracheal septum
How is the muscular coat from mesoderm structured? upper 2/3 striated and lower 1/3 smooth
What is are common anomalies of the esophagus and what do they result in? Atresia - proximal portion ends in blind sac and Esophagotracheal fistula - distal portion connected to trachea; they result in Polyhydramnios
How does the Stomach rotate? Longitudinal axis 90 degrees clockwise; original dorsal side of tube now on left. Anterior-posterior axis clockwise so original dorsal side now inferior and forms greater curvature
What is a common anomaly of the stomach? What causes it and does it cause? Pyloric Stenosis - narrowing of pyloric lumen. Caused by hypertrophy of muscle layer. Causes obstruction of passing food and projectile vomiting after feeding
What forms the Duodenum? Foregut (proximal to entrance of the bile duct) and Midgut
What causes the C-shape of the duodenum? The rotation of the stomach
What happens to the Duodenum during the second month? The lumen is obliterated and then recanalized
The connection of the Liver to the Foregut forms what? Bile Duct
What does the ventral outgrowth of the bile duct form? The Gall Bladder and cystic duct
The liver penetrates ______ (mesodermal plate between pericardial cavity and stalk of yolk sac) and expands Septum Transversum
Created by: cfierro