Chap 22 Flashcards
The head of sperm if made of …..
Nucleus and its capped by a membrane bound acrosome
What’s zona pellucida?
Extra cellular matrix surrounding the plasma membrane of the oocyte
Zona pellucida is surrounded by a few layers of follicle cells called ….
Corona radiata
Ovary
تخمدان
What are the cellular stages of development?
- cleavage resulting in multicellular embryo
2. formation of blastula
Cell division without growth is called
Cleavage
What is the ball of cells formed in formed in cleavage stage ?
Morula
What’s the hallow ball of cells formed after cleavage stage of development ?
Blastula
What’s the fluid-filled cavity in blastula?
Blastocoele
Vertebrate
مهره داران
What stage of tissue development is this:
Certain cells push and invaginate into blastula, creating a double layer of cells
Early gastrula stage
…..involves the formation of three layers of cells that will develop to adult organs.
Gastrulation
The outer layer of cells in early gastrula is called ….
Ectoderm
The inner layer of cells in early gastrula is called ….
Endoderm
What cellular layer of gastrula borders the gut?
Endoderm
The hole created by invagination of cells in early gastrula is called…
Blastopore
What part of gastrula becomes anus in lancelet?
Blastopore
How many layers of cells are present in late gastrula?
Three layers
Ectoderm
Mesoderm
Endoderm
Primitive guy that forms in gastrula is called …
Archenteron
…..is the space between two mesoderm layers and will later developed into …..cavity
Coelom
Abdominal cavity
Ectoderm, mesoderm, endoderm are called embryonic …… …….
Germ layers
Define fertilization
The Union of a sperm and a oocyte resulting in a zygote
