Embryology Flashcards

1
Q

The first two weeks of prenatal development is known as the

A

Pre-embryonic period

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

How do you define the foetal period?

A

From week 9 of development until birth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

A fertilised ovum is known as a

A

Zygote

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

The specialised extracellular matrix that surrounds the developing oocyte is known as the

A

Zona pellucida

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

List some of the functions of the Zona pellucida

A
  1. Provides nutritional and mechanical support to the oocyte
  2. Helps in binding of sperm
  3. Protmotes acrosomal reaction
  4. Prevents polyspermy
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

List the four outcomes of fertilisation:

A
  1. Restores normal diploid number of chromosomes (46)
  2. Secondary oocyte completes meiosis
  3. The sex of the embryo is established
  4. Initiation of cell division (cleavage)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

The rapid mitotic division of cells in a zygote is known as

A

Cleavage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the outcome of “cleavage?”

A
  • Zygote undergoes rapid cell divisions with no overall growth, producing a cluster of cells.
  • Different cells derived as a result of cleavage are called blastomeres
  • Result is a compact mass/ball of cells called a morula
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

When is the “embryonic period?”

A

Weeks 3-8

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is the significance of the embryonic period?

A

Most of the organ systems are developed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What are the normal sites of implantation of the embryo?

A

The fundus of the uterus, posterior wall of the uterus, sometimes the side walls

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the outcome of implantation of the embryo in the fallopian tubes?

A

Ectopic pregnancy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What are the names of the three major germ layers in an embryo?

A

Endoderm, mesoderm, ectoderm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly