Embryology 1 Flashcards Preview

Respiratory System > Embryology 1 > Flashcards

Flashcards in Embryology 1 Deck (99)
Loading flashcards...
1

What are the different phases of embryology?

Pre-embryonic phase (0-3 weeks)

Embryonic phase (4-8 weeks)

Foetal phase (9-40 weeks)

Postnatal

2

What does the pre-embryonic phase last between?

0-3 weeks

3

What does the embryonic phase last between?

4-8 weeks

4

What does the foetal phase last between?

9-40 weeks

5

What is spermatogenesis?

Process by which a haploid spermatozoa develops from germ cells in the seminiferous tubules of the testis

6

What is the process by which a haploid spermatozoa develops from germ cells in the seminiferous tubules of the testis called?

Spermatogenesis

7

What is oogenesis?

Process of development of ova that takes place in the ovaries

8

What is the process of development of ova that takes place in the ovaries known as?

Oogenesis

9

What is produced during spermatogenesis?

4 spermatozoa (sperm) are produced from one spermatogonium

10

What is produced during oogenesis?

1 ova and 3 polar bodies are produced from one oogonium

11

What is spermatogonium?

Cell produced at an early stage in the formation of spermatozoa

12

What is the precurser for spermatogenesis?

Spermatogonium

13

What is oogonium?

Immature female reproductive cell that gives rise to primary oocytes by mitosis which go on to produce ova by meiosis

14

What is the precruser of oogenesis?

Oogonium

15

How many chromosomes do spermatogonium and oogonium have?

46 chromosomes

16

How does each sperm and ova compared to other sperm and ova?

Each one is genetically unique

17

What happens during fertilisation?

Several sperm surrounds the ovum, where one penetrates and its nucleus enters and fuses with the nucleus of the ovum to give a diploid cell called the zygote

18

What is a zygote?

Fertilised ovum

19

What happens during week 1 of the pre-embryonic phase?

Zygote is formed and divides to form a blastocyst

Blastocyst moves through uterine tube to reach uterine cavity

20

21

During what week is the zygote formed and divides to form a blastocyst?

Week 1

22

During what week does the blastocyst move through the uterine tube to reach the uterine cavity?

Week 1

23

How many chromosomes does a zygote have?

46 (diploid)

24

Why is each zygote genetically unique?

23 of mothers chromosomes and 23 of fathers chromosomes

25

Where does a zygotes mitochondria and cell organelles originate from?

Mother

26

What does a zygote divide to form?

Morula by dividing by mitosis

27

What is a morula?

Solid ball of cells

28

What does mitochondria being inherited from the mother mean in terms of genetic disease?

Mitochondrial genetic diseases cannot be inherited from the father

29

What is an example of a mitochondrial disease?

Leber's disease

 

Hereditary optic neuropathy which leads to blindness

30

What is Leber's disease?

Hereditary optic neuropathy which leads to blindness