Lecturio 1

Question 1

Identify

Answer 1

Question 2

What is a morula?

Answer 2

A 16-celled zygote

Question 3

What does a morula contain?

Answer 3

An outer cell mass that surrounds an inner cell mass

Fluid penetration of zona pellucida

Question 4

The morula become a blastocyst when fluid forms ___

Answer 4

Blastocyst cavity (a.k.a. blastocele)

Question 5

The morula become a blastocyst when fluid forms ___

Answer 5

Blastocyst cavity (a.k.a. blastocele)

Question 6

Blastocyst become the late blastocyst when

1. ____ enlarges
2. Inner cell mass move to ___

Answer 6

1. Blastocyst cavity
2. 1 pole

Question 7

This is Late Blastocyst

→ Identify

Answer 7

Question 8

Outer cell mass in morula become ____ in blastocyst

Answer 8

Trophoblast

Question 9

Inner cell mass in morula become ____ in blastocyst

Answer 9

Embryoblast

Question 10

Trophoblast in blastocyst become ____

Answer 10

Placenta

Question 11

Embryoblast in blastocyst become ____

Answer 11

Embryo

Question 12

Identify. Which day is this?

Answer 12

Day 7

Question 13

As the embryoblast implants into uterus

→ It differentiates into 2 cell sheets

→ What are they?

Answer 13

The hypoblast and epiblast layer

Question 14

As the embryoblast __ into uterus

→ It differentiates into 2 cell sheets: The hypoblast and epiblast layer

Answer 14

implants

Question 15

How is the hypoblast layer formed?

Answer 15

Layer of embryoblast cells that are in contact with the blastocyst cavity

(small and cuboidal)

Question 16

How is epiblast layer formed?

Answer 16

Formed by cells of inner cell mass that remain

Question 17

Identify

→ Which day is it?

Answer 17

The hypoblast and epiblast layer

Question 18

How is the amniotic cavity formed?

Answer 18

Cells in the epiblast layer grow tall and require their own cavity

→ Amniotic cavity is formed

Question 19

Day 8 - 9

How is Heuser’s membrane formed?

Answer 19

Hypoblast cells proliferate and line the blastocyst cavity as Heuser’s membrane

Question 20

Hypoblast cells proliferate and line the blastocyst cavity as Heuser’s membrane

→ The cavity is called ___

Answer 20

The primary (primitive) yolk sac

Question 21

EMBRYOBLAST - DAY 10 - 12

→ IDENTIFY?

Answer 21

Question 22

EMBRYOBLAST - DAY 10 - 12

The cells surrounding the primary yolk sac proliferate and form a layer called (1)____

→ This layer expands to completely surrounds the (2) ____

Answer 22

1. Extraembryonic mesoderm
2. embryoblast

Question 23

EMBRYOBLAST - DAY 10 - 12

How is Extraembryonic mesoderm formed?

Answer 23

By The cells surrounding the primary yolk sac proliferate

→ This layer expands to completely surrounds the embryoblast

Question 24

Embryoblast - Day 12 - 13

→ Identify

Answer 24

Question 25

_Embryoblast - Day 13_ IDENTIFY

Answer 25

Question 26

_Embryoblast - Day 12 - 13_ ## Footnote The extra embryonic mesoderm develops fluid-filled gaps, (1)\_\_\_\_, that fuse and enlarge. Once these spaces surround the embryo → They become (2)\_\_\_

Answer 26

1. the extraembryonic coelom 2. the chorionic cavity

Question 27

_Embryoblast - Day 13_ ## Footnote Extraembryonic mesoderm lines all surfaces of the (1)\_\_\_ → Expansion of chorionic cavity pinches (2)\_\_\_ into 2 parts

Answer 27

1. chorionic cavity 2. the primitive yolk sac

Question 28

_Embryoblast - Day 13_ _IDENTIFY_

Answer 28

Question 29

_Embryoblast - Day 13_ _IDENTIFY_

Answer 29

Question 30

The remnants of (1)\_\_\_ move to the other side of the chronic cavity → They are known as (2)\_\_\_

Answer 30

1. the primary yolk sac 2. exocolomic cysts

Question 31

_Embryoblast - Day 14-15_ Identify

Answer 31

Question 32

**_Embryoblast Day 14-15_** ## Footnote As the chorionic cavity enlarges, the embryo remains attached to the trophoblast by extraembryonic mesoderm at connecting stalk, the future site of the umbilical cord.

Question 33

**_Embryoblast Day 14-15_** ## Footnote As ____ enlarges, the embryo remains attached to the trophoblast by extraembryonic mesoderm at connecting stalk, the future site of the umbilical cord.

Answer 33

the chorionic cavity

Question 34

**_Embryoblast Day 14-15_** ## Footnote As the chorionic cavity enlarges, the embryo remains attached to ____ by extraembryonic mesoderm at connecting stalk, the future site of the umbilical cord.

Answer 34

the trophoblast

Question 35

**_Embryoblast Day 14-15_** ## Footnote As the chorionic cavity enlarges, the embryo remains attached to the trophoblast by ___ at connecting stalk, the future site of the umbilical cord.

Answer 35

extraembryonic mesoderm

Question 36

**_Embryoblast Day 14-15_** ## Footnote As the chorionic cavity enlarges, the embryo remains attached to the trophoblast by extraembryonic mesoderm at \_\_\_\_, the future site of the umbilical cord.

Answer 36

connecting stalk

Question 37

**_Embryoblast Day 14-15_** ## Footnote As the chorionic cavity enlarges, the embryo remains attached to the trophoblast by extraembryonic mesoderm at connecting stalk, the future site of \_\_\_\_

Answer 37

the umbilical cord