Embryology Flashcards
What is the foregut?
Mouth to common bile duct.
Composes of: Pharynx Oesophagus Stomach Proximal half of duodenum
What is the midgut?
Common bile duct to 2/3rds of transverse colon.
Composes of: Distal half of duodenum Jejunum Ileum Caecum Appendix Ascending colon Right 2/3 of transverse colon
What is the hindgut?
Starts at 2/3rds of transverse colon to anal canal
Composes of: Left 1/3 of transverse colon Descending colon Sigmoid colon Rectum Anal canal
Which artery supplies the foregut?
Celiac artery
Which artery supplies the midgut?
Superior mesenteric artery
Which artery supplies the hindgut?
Inferior mesenteric artery
Which parts of the embryo give rise to the primitive gut?
Endoderm and visceral mesoderm
What does the endoderm give rise to?
Epithelial lining of digestive tract
Hepatocytes
Endocrine and exocrine cells of pancreas
What does the visceral mesoderm give rise to?
Muscle
Connective tissue
Which embryonic structures give rise to the pharynx and larynx?
Pharyngeal arches 1,2,3,4 & 6 (no 5)
What is a mesentery?
A double layer of peritoneum that surround an organ and connects it to the body wall.
What causes a greater and lesser curvature of the stomach?
The fact that the dorsal wall grows faster than the ventral wall.
How is the lesser sac formed?
Stomach rotates 90 degrees clockwise at 7th week, producing a space behind it = the lesser sac
What is gastroschisis?
When the gut remains outside an infant when they are born.
