Development of alimentary (digestive) system Flashcards
What is gastrulation?
A single layered blastula –> trilaminar gastrula forming the 3 germ layers
What are the 3 germ layers?
Ectoderm, mesoderm and endoderm
What are the general components of the alimentary system and where does it run from?
Mouth to anus (the tract) with associated glands and organs eg liver, gallbladder, pancreas
What week does the primordial gut from?
Week 4
What are the 2 ends of the primordial gut called and what end is broader?
Cranial and caudal with the cranial end being broader
What is the cranial end of the primordial gut closed by?
Oropharnygeal membrane
What is the caudal end of the primordial gut closed by?
Cloacal membrane
As the head and tail folds what part is taken in by the embryo?
Yolk sac
Name the 3 parts of the primordial gut tube
foregut, midgut and hindgut
What part of the primordial gut forms most of the gut, epithelium and glands
Endoderm
What does the intraembryonic coelom give rise to?
Embryonic body cavity
What will the embryonic cavity give rise to?
Peritoneum, pericardium and pleural cavities
What are the constituents of the foregut?
Primordial pharynx, LRT, oesophagus, stomach, duodenum, liver, biliary apparatus and pancreas
What does the tracheoesophageal ridge divide?
Divides the trachea and oesophagus
Oesophageal atresia is due to what?
The oesophagus not growing properly
Failure of recanlization
What is polyhydraminios
The accumulation of excess amniotic fluid
What is a tracheosophageal fistula?
Trachea and oesophagus communicate due to the abnormal deviation of septum
What degrees and in which direction does the stomach rotate?
90, clockwise
What is the dorsal mesogastrium?
The portion of the dorsal mesentery attached to the greater curvature of the stomach
What does the dorsal mesogastrium develop into?
Greater omentum
When the stomach rotates to the left, a space is made behind the stomach? What does this become?
Lesser omentum/ omental bursa
What nerves supply the liver?
vagus (left and right)