2. Development Of The Gut Flashcards
What does the mesoderm split up into?
Paraxial
Intermediate
Lateral plate
What does the paraxial layer of the mesoderm go on to form?
Somites - skeletal muscle, vertebra, cartilage
What does the intermediate layer of the mesoderm go on to form?
Kidneys
Gonads
What does the lateral plate layer of the mesoderm go on to form?
Somatic and splanchnic mesoderm
What are the major component of the ectoderm form?
Epidermis
Nerve tissue
What does the endoderm go on to form?
Epithelia of gut
What does the foregut form?
Oesophagus to the duodenum
What does the midgut form?
Duodenum to distal 2/3 transverse colon
What does the hindgut form?
Distal 2/3 transverse colon to upper anal canal
What is the passage between the midgut and yolk sac called and what is its purpose?
Vitelline duct
Meckel’s diverticulum forms which connects to the umbilicus
When does cranio-caudal folding take place?
4th week
How is an opening formed in the head end of the embryo?
Buccopharyngeal membrane ruptures in 4th week
How is an opening formed in the tail end of the embryo?
Cloacal membrane ruptures in week 7
Which artery supplies the foregut?
Coeliac artery
Which artery supplies the midgut?
Superior mesenteric artery
Which artery supplies the hindgut?
Inferior mesenteric artery
What happens to the foregut in week 4?
Lung bud forms off the foregut to form a respiratory bud
Tracheoesophageal septum then forms separating the trachea from the oesophagus
What is the space between the parietal and visceral peritoneum?
Peritoneal cavity
Where does the liver develop?
Ventral mesentery of the foregut
Where does the spleen develop?
In the dorsal mesentery of the foregut
Where is the lesser sac in the peritoneal cavity?
Behind the stomach
Where is the greater sac of the peritoneal?
Anterior to the stomach
What is the falciform ligament?
Runs from anterior wall of abdomen to liver
What is the lesser amentum?
Mesentery from liver to stomach
