Lecturio 1 Flashcards
Identify
What is a morula?
A 16-celled zygote
What does a morula contain?
An outer cell mass that surrounds an inner cell mass
Fluid penetration of zona pellucida
The morula become a blastocyst when fluid forms ___
Blastocyst cavity (a.k.a. blastocele)
Blastocyst become the late blastocyst when
- ____ enlarges
- Inner cell mass move to ___
- Blastocyst cavity
- 1 pole
This is Late Blastocyst
→ Identify
Outer cell mass in morula become ____ in blastocyst
Trophoblast
Inner cell mass in morula become ____ in blastocyst
Embryoblast
Trophoblast in blastocyst become ____
Placenta
Embryoblast in blastocyst become ____
Embryo
Identify. Which day is this?
Day 7
As the embryoblast implants into uterus
→ It differentiates into 2 cell sheets
→ What are they?
The hypoblast and epiblast layer
As the embryoblast __ into uterus
→ It differentiates into 2 cell sheets: The hypoblast and epiblast layer
implants
How is the hypoblast layer formed?
Layer of embryoblast cells that are in contact with the blastocyst cavity
(small and cuboidal)
How is epiblast layer formed?
Formed by cells of inner cell mass that remain
Identify
→ Which day is it?
The hypoblast and epiblast layer
How is the amniotic cavity formed?
Cells in the epiblast layer grow tall and require their own cavity
→ Amniotic cavity is formed
Day 8 - 9
How is Heuser’s membrane formed?
Hypoblast cells proliferate and line the blastocyst cavity as Heuser’s membrane
Hypoblast cells proliferate and line the blastocyst cavity as Heuser’s membrane
→ The cavity is called ___
The primary (primitive) yolk sac
EMBRYOBLAST - DAY 10 - 12
→ IDENTIFY?
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) ____
- Extraembryonic mesoderm
- embryoblast
EMBRYOBLAST - DAY 10 - 12
How is Extraembryonic mesoderm formed?
By The cells surrounding the primary yolk sac proliferate
→ This layer expands to completely surrounds the embryoblast
Embryoblast - Day 12 - 13
→ Identify
Embryoblast - Day 13
IDENTIFY
Embryoblast - Day 12 - 13
The extra embryonic mesoderm develops fluid-filled gaps, (1)____, that fuse and enlarge.
Once these spaces surround the embryo → They become (2)___
- the extraembryonic coelom
- the chorionic cavity
Embryoblast - Day 13
Extraembryonic mesoderm lines all surfaces of the (1)___
→ Expansion of chorionic cavity pinches (2)___ into 2 parts
- chorionic cavity
- the primitive yolk sac
Embryoblast - Day 13
IDENTIFY
Embryoblast - Day 13
IDENTIFY
The remnants of (1)___ move to the other side of the chronic cavity
→ They are known as (2)___
- the primary yolk sac
- exocolomic cysts
Embryoblast - Day 14-15
Identify
Embryoblast Day 14-15
As ____ enlarges, the embryo remains attached to the trophoblast by extraembryonic mesoderm at connecting stalk, the future site of the umbilical cord.
the chorionic cavity
Embryoblast Day 14-15
As the chorionic cavity enlarges, the embryo remains attached to ____ by extraembryonic mesoderm at connecting stalk, the future site of the umbilical cord.
the trophoblast
Embryoblast Day 14-15
As the chorionic cavity enlarges, the embryo remains attached to the trophoblast by ___ at connecting stalk, the future site of the umbilical cord.
extraembryonic mesoderm
Embryoblast Day 14-15
As the chorionic cavity enlarges, the embryo remains attached to the trophoblast by extraembryonic mesoderm at ____, the future site of the umbilical cord.
connecting stalk
Embryoblast Day 14-15
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
