embryology

Question 1

ons develops form which part of trilaminar disc?

Answer 1

ectoderm

Question 2

how does neural tube form?

Answer 2

1. ectoderm thickens
2. neural folds form
3. they migrate down and fuse at midline to form tube

Question 3

closure of neural tube occurs where?

Answer 3

occurs in cranial and caudal ends and at several points along tube

Question 4

how is spider bifida associated with neural tube closure?

Answer 4

it Is the failure of closure of caudal end of tube

Question 5

brain vesicles divisions explain

Answer 5

3 PRIMARY
5SECONDARY

forebrain - prosencepcalon
= telence-
=dience-

midbrain -mesencephalon

hindbrain - rhombencephalon
=metence-
=myelence-

Question 6

folding of cns? 3 flexures

Answer 6

cephalic
cervical
pontine

Question 7

cortical folding forms?

Answer 7

develops sulci/gyri

Question 8

what part of neural tube forms ventricles?

Answer 8

lumen

Question 9

what forms most cells of cns?

Answer 9

neural tube too

Question 10

PNS develops from what?

Answer 10

neural crest cells NOT NEURAL TUBE

Question 11

NEURAL CREST form what?

Answer 11

PNS
NEURONS AND GLIA CELLS OF PNS
ETC

Question 12

SPINAL NERVES DEVELOP FROM?

Answer 12

BOTH NEURAL TUBE AND NEURAL CREST CELLS

SENSORY COMPONENT - NEURAL CREST
MOTOR COMPONENT - NEURAL TUBE

Question 13

DEVELOPMENT OF NERVOUS SYTEM OCCURS WHEN?

EXPLAIN WEEKS?

Answer 13

3RD WEEK BEGIN

4TH WEEK - NEURAL TUBE CLOSED

Question 14

NERUAL TUBE DEFECTS? 3 e.g.

Answer 14

failure to close properly
spina bifida
anencephaly
encephalocoele