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Flashcards in Embryo for test Deck (30):
1

Where does sperm fertilize the egg?

Ampulla of fallopean tube

2

Define fertilization

fusion of the male and female pronucleus

3

What part of the egg hardens during block of polyspermy?

zona pellucida

4

What are the first 2 layers that the sperm penetrates?

Corona radiata, then zona pellucida

5

How many blastomeres are found in the morula?

16-32

6

Where is the site of implantation?

Superior lateral uteral wall

7

What is an ectopic pregnancy?

Fertilized egg develops outside uterus

8

What is placenta previa?

Placenta forms too low and blocks uterine cervix, leading to bleeding and death of fetus

9

During the 2nd week of pregnancy, what layers form?

Embryoblast: epi and hypoblast
Trophoblast: cyto and syncytiotrophoblast
2 cavities: amniotic cavity and yolk sac

10

Which of the 3 germ layers do brain and spinal cord arise from?

Ectoderm

11

Which of the 3 germ layers do kidneys and gonads arise from (specifically)?

Intermediate mesoderm

12

What are the 2 types of lateral plate mesoderm?

Somatic mesoderm and splanchnic mesoderm

13

What do somites give rise to (generally)?

Schlerotome, dermotome, myotome

14

What germ layer does the notochord arise from?

Mesoderm

15

What germ layer does hair, nails, and glands of skin arise from?

Ectoderm

16

What does schlerotome come from and what does it give rise to?

- Comes from somites
- Gives rise to vertebrae and ribs
("schler" = hard)

17

What does the notochord give rise to?

Nucleus pulposis of intervertebral discs

18

What does myotome come from and what does it give rise to?

- Comes from somites
- Gives rise to trunk and limb musculature

19

What does somatic mesoderm come from and what does it give rise to?

Comes from lateral plate mesoderm

- Parietal serosa
- Ventral dermis (dermotome gives dorsal)
- CT of limbs (bones, ligaments, joints)

20

What does splanchnic mesoderm come from and what does it give rise to?

Comes from lateral plate mesoderm

- Walls of dig/resp tracts (but not epithelium)
- Visceral serosa
- Heart
- Blood vessels

21

What does dermatome come from and what does it give rise to?

- Comes from somites
- Gives rise to dorsal dermis --"dermatome gives dorsal dermis"
(somatic mesoderm gives ventral dermis)

22

Describe the pharyngeal apparatus's layers.

CAP:
Clefts,
Arches,
Pouches

23

What do the children tend to do at the Golden Arches (McDonalds)?

Chew
Smile
Stylish
Swallow
Speak

24

What pharyngeal arch is associated w/what CN?

Arch:
1 -- V
2 -- VII
3 -- IX
4/6 -- X

25

What are the fates of the pharyngeal pouches?

Ear, Tonsils, Bottom To Top (4)
1. Tympanic cavity and auditory tube (ear)
2. Palatine tonsils and tonsillar fossa (tonsils)
3. Inferior parathyroid (bottom)
3. Thymus (to)
4. Superior parathyroid (top)

26

What is the fate of the 1st pharyngeal cleft?

External auditory meatus

27

What is the fate of the 2nd, 3rd, and 4th pharyngeal clefts?

Obliteration via growth of a cervical sinus
- If this persists, forms a branchial cyst/fistula!

28

What layer do phayngeal pouches comprise?

endoderm

29

What layer do phayngeal clefts comprise?

ectoderm

30

What layer do phayngeal arches comprise?

mesoderm