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Flashcards in Embryology II Deck (72)
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1

What is the first step in gastrulation?

Formation of the primative streak and primative node

2

Where is the primative node located?

at the cranial end of the streak

3

What is at the center of the primative node?

primative pit

4

What forms the primative streak?

thickening of the epiblast cells

5

When do cells fall through the primative streak?

days 2-3 or third week

6

What is the 1st layer of epiblast cells that move through the primative streak?

endoderm

7

What group of cells does not enter the primative streak?

ectoderm

8

What group of epiblast is second through the primative streak?

mesoderm

9

What is formed by the endoderm, ectoderm, and mesoderm?

trilaminar disk

10

What marks the end of gastrulation?

The primitive streak receeds caudally
Cells in node migrate cranially

11

What is formed by the cells that move cranially at the end of gastrulation?

notocord

12

When do most newborn tertatomas develope?

around week 3

13

What is the 4th major tissue that is derived at the end of gastrulation?

notocord

14

What is derived from the pharyngeal arch of mesoderm?

most skeletal muscle of the head
aortic arches

15

What is derived from the cardiac mesoderm?

cardiovascular structures

16

What is derived from the laterally migrating mesoderm?

paraxial mesoderm
intermediate mesoderm
lateral plate mesoderm

17

What day do mesodermal cells begin migrating?

day 16

18

When does laterally migrating mesoderm split into 3 distict regions?

day 20

19

What is derived from the paraxial (somite) mesoderm?

makes caudal block of somites that give rise to musculoskeletal system and dermis

20

Where is paraxial (somite) mesoderm located?

immediately lateral to the notcord

21

What does the intermediate mesoderm give rise to?

urogenital system

22

What happens to lateral plate mesoderm ~d18-20?

Forms vesicles to form intraembryonic coelum

23

What does the intraembryonic coelum give rise to?

body cavities, pleural, pericardial, and parietal spaces

24

What gives rise to the visceral and parietal mesoderm?

intraembryonic coelum

25

T or F: parietal mesoderm fuses with endoderm?

False - it fuses with the ectoderm

26

What comes of the parietal mesoderm?

Skeleton of limbs
Parietal layers of serous membranes

27

What comes of the visceral mesoderm?

smooth muscle walls of the gut tube
visceral layer of serous membranes
cardiac muscle of heart tube

28

What three broad categories of tissue are derivatives of mesoderm?

musculoskeletal, cardiovascular, and genitourinary

29

What comes of the musculoskeletal mesoderm?

muscle (smooth, cardiac, skeletal)
CT
Bone and cartilage

30

What comes of the cardiovascular mesoderm?

Blood, lymph, CV tissues
speel