Chapter 3- Organogenesis

Question 1

Organogenesis timeline

Answer 1

3rd -> 8th week

Question 2

Developement of the cephalo-caudal gradient of maturity

Answer 2

Formation of notochord , then appearance of neural plate.

Question 3

Neurulation

Answer 3

lateral folding of neural plate to make a neural groove

Question 4

Brain vesicles (3)

Answer 4

Pros - forebrain
Mes- Midbrain
Rhomben- Hindbrain

Question 5

Mesodermal columns

Answer 5

Paraxial
Intermediate plate
Lateral plate

Question 6

Praxial mesoderm

Answer 6

somites

sclerotomes, dermomytomes and myotomes

Question 7

How many pairs are present at end of 5th week

Answer 7

42/44 pairs
4occi
8cervi
12thoracic
5lumbar
5sacral
8-10coccgygeal
1occi and 7coccy leave

Question 8

Intermediate Mesoderm

Answer 8

Connect praxial to lateral plate
Upper part = nephrotomes
lower part= nephrogenic cord

Question 9

Lateral Plate splits into

Answer 9

Somatic and splanchnic mesoderm, the inbtween is coelom