14- Neurulation

Question 1

A/P Variation in Chicken

Answer 1

Anterior has finished neurulation while posterial still undergoing gastrulation

Question 2

A/P Variation in Amphibians/Fish

Answer 2

Temporal gradient less obvious

Only tail sections produced by secondary neurulation

Question 3

A/P Variation in Mammals

Answer 3

Sacral vertebrae= secondary neurlation

Question 4

A/P Variation in Birds

Answer 4

Vertebrae pas hind limbs produces by secondary neurulation

Question 5

Basal Chordates

Answer 5

only primary

Question 6

Anencephaly

Answer 6

Anterior NT doesn’t close

Forebrain remains in contact with amniotic fluid

Question 7

Craniorachischisis

Answer 7

Multiple failures to close spinal chord

Brain and end of spinal cord are both exposed

Most severe form

Question 8

Spina Bifida

Answer 8

Posterior neuropore doesn’t close