Blastocyst Formation and Implantation Flashcards
1
Q
What happens to the diploid zygote after fertilisation?
A
- it divides immediately by mitosis to form two cells
2
Q
What happens after the diploid zygote divides by mitosis?
A
- each cell divides repeatedly until a solid ball of cells is formed
3
Q
What is the solid ball formed by repeated cell division called?
A
- the morula
4
Q
What does the morula resemble?
A
- a mulberry
5
Q
What does the morula develop into?
A
- it develops into a hollow, fluid-filled ball of cells
- the blastocyst
6
Q
What is the trophoblast?
A
- a layer formed by the outer cells forming the wall of the blastocyst
7
Q
What does ‘tropho’ mean?
A
- it relates to feeding
8
Q
What develops from the trophoblast?
A
- an inner cell mass develops from the trophoblast
9
Q
When does the development of the cell mass from the trophoblast take place?
A
- as the developing embryo moves along the fallopian tube towards the uterus
10
Q
How does the embryo move along the fallopian tube towards the uterus?
A
- it moves by combination of peristaltic waves and the rhythmic beating of the fallopian tube’s cilia
11
Q
What happens to the blastocysts a few days after it has been in the uterus?
A
- it sinks into the thickened, highly vascular endometrium
- this is called implantation
12
Q
When does implantation occur?
A
- about 10 days after fertilisation
