facial embryology

Question 1

what you need toknow by week 4

Answer 1

neurlation is complete

pharyngel pouches are forming

external human face develops between 4 and 6 weeks

and each pharyngeal arch has its own artery, nervee, and cartilage

Question 2

zygote

Answer 2

egg and sperm nucleaus - after fertilization

metaphase stage
stays here until day 4 = morula

Question 3

blastulation

Answer 3

mass of cell forms - begins to differentiate

Question 4

gastrulation

Answer 4

3 germ layers

cell mass = gastrula

Question 5

gastrulation

Answer 5

3 germ layers

cell mass = gastrula

Question 6

layer we worry about

Answer 6

ectoderm

Question 7

neural crest =

Answer 7

PNS

Question 8

our story begins when

Answer 8

week 4

Question 9

5 arches by when

Answer 9

week 5

Question 10

nerves

Answer 10

5 7 9 10

Question 11

facial development is largerly done by when

Answer 11

week 6

Question 12

facial development is largerly done by when

Answer 12

week 6

Question 13

ectodermal layer gives rise to

Answer 13

tissues on outer

Question 14

it it logicala to assume skin health to brain health?

Answer 14

question she asked us since ectoderm has derivitives of same

Question 15

day 4
day 5
day 6-?

Answer 15

4= morula
5= early blastocyst 
6-7 = blastocyst implantation

Question 16

gestational age is based on?

fetal / embryonic age is?

Answer 16

gestational = based on first day of last menstrual period

fetal / embryononic = two weeks less than gesttional age

gestational at week 3 = 1 week old of fertilization
(4 =2)

Question 17

ectoderm **

differentiates to form

Answer 17

nervous sytem
central (neural plate)
PNS - NEURAL CREST

SURFACE ECTODERM = epidermis

Question 18

pigmented cells come from

Answer 18

neural crest

Question 19

placodes =

Answer 19

head sensory and endocrine structures

Question 20

adrenal gland and medullary cells?

Answer 20

neural crest

Question 21

cartilage, bone, bloood vessels endothelium, dermis, muscle, cardiac, skeletal smooth comes from?

Answer 21

mesoderm

Question 22

mesoderm we care about?

Answer 22

cartilage, bone, bloood vessels endothelium, dermis, muscle, cardiac, skeletal smooth comes from?

Question 23

‘our story’ begins when

Answer 23

week 4

external human face develops between 4 and 6 weeks

Question 24

pharyngela arches time wise

Answer 24

5 arches present by week 5

Question 25

nasal placode and eye when?

Answer 25

week 5 GA 7)

Question 26

facial development is largely complete by end of?

Answer 26

6th week

Question 27

specifics at week 6 (GA 8)

Answer 27

rapid head enlargement
auricular hillocks
nasolacrimal groove formation 
lip and palate components of upper lip 
mesial nasal prominense and max process present
median palantine process appears 

eye showing retinal pigment , nasolacrimal groove, nasal pit, fourth ventricle of brain, umbilical cord

beginning of formation of eyelids, tip of nose distint

facial development basically / largely complete by end of week 6
between 6-8 = palate

Question 28

length at week 7

Answer 28

16-18 mm

Question 29

pigmented eyelid and nasolacimal groove, and external acoustic meatus best describes what time?

Answer 29

week 7

Question 30

tensor tympani and stapedius form when?

Answer 30

week 8

tensor = arch 1 
stapedius = arch 2

Question 31

is it logical that skin can be an indicatory of brain health?

Answer 31

something we discussed - so something to conceptually think about