embryonic development

Question 1

at what point does the tri-laminar disc become human?

Answer 1

3 weeks

Question 2

ectoderm becomes what?

Answer 2

-skin, hair, nails
- neural tube… spinal cord (nervous system)

Question 3

mesoderm becomes what?

Answer 3

-muscles, bones
- cardiovascular sysetm
- spilts to form cavities

Question 4

endoderm becomes what?

Answer 4

-gi tract
- respiartory lining
- redproductive tract

Question 5

describe the bone growth from a fetus to an adult

Answer 5

• cartillage is formed by chondroblats and reshaped by chondrocytes
• the cartillage will be replaced by bone (ossification)

Question 6

What is the fossa ovalis?

Answer 6

• This is the site of foraman ovale in the foetus.
• it is an interatrial septum opening, allowing oxygenated blood to by pass the lungs
• happens via placental absorption from the mother