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Flashcards in Definitions in Embryology Deck (13)
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1

Define Gametogenesis

Formation of gametes (sperm and eggs)

2

Define Cleavage

Cell division of the zygote by mitosis, the cells formed are identical diploid cells but half the size of the parent cell. The cleavage leads to the formation of the morula and then the blastocyst

3

Define Gastrulation

Formation of the embryonic disc

4

Define Embryonic disc

Ectoderm, mesoderm, endoderm- the primary three germ layers of embryonic tissue

5

Define Germ layers

Ectoderm, endoderm, mesoderm

6

Define Morula

Tight cluster of diploid cells formed by cleavage, it forms by day 2-3 post fertilisation

7

Define Blastomere

A cell formed by cleavage I.e. the cells that make up the morula and blastocyst

8

Define Primordial germ cells

Formed by 4 weeks gestation- these are the cells that will eventually develop into gametes

9

Define zona pellucida

A glycoprotein layer surrounding the oocyte

10

Where does the blastocyst hatch from?

The zona pellucida

11

Define corona radiata

The innermost layer of cells that surrounds the zona pellucida that surrounds the oocyte

12

Define cumulus oophorus

A layer of granulosa cells that surround the zona pellucida and oocyte. It contains the corona radiata at it's innermost layer of cells

13

Define perivitelline space

Space between the oocyte and zona pellucida. it is where the secondary body lodges after meiosis