Abnormalitiles, Embryonic And Foetal Periods Flashcards
What is cranial folding?
Forms foregut
Develops heart tube displaced in thoracic cavity
What is lateral folding?
Where thoracic and abdominal cavity created, closing fore and hindgut
What is caudal folding?
Connecting stalk displaced centrally alongside neck of yolk sac forming hind gut anus and umbilical cord
What happens in the third month?
Limbs lengthen
Becomes human like
Sex determined
1 degree ossification centres in long bones and skulls
What happens in 4&5th month
Rapid increase in length
6th month?
Rapid increase in weight
Major abnormalities occur at what weeks?
3-8
When does the heart develop?
In week 4- essential for continued growth of embryo
How does the 4 hear chambers come about?
1- growth of 2 septa
What does the foramen ovale do?
Right atrium-high pressure
L atrium low pressure before birth
After birth it’s the opposite
How do the muscles grow?
Upwards from wall of expanding ventricle
Prove patent foramen ovale
Septums fail to fuse
