Embryology recap

Question	Answer
What are the 6 stages of embryogenesis?	1)Gametogenesis 2)Fertilisation 3) Cleavage 4) Gastrulation 5)Formation of tube-within-a-tube body plan 6) Organogenesis
What is gametogenesis called in males?	Spermiogenesis
What is gametogenesis called in females?	Oogenesis
Where does fertilisation normally occur?	Ampulla of the uterine tube
What are the enzymes called that are released from the cortical granules to harden the zona pellucida during fertilisation?	Lysosomal enzymes
Name all the structures indicated by the arrows. Image: Picture2 (binary/octet-stream)	Image: Picture3 (binary/octet-stream)
What is cleavage?	Repeated cell division, increasing the number of cells in the zygote
In the blastocyst, what are the cells called that are found on the outside and on the inside?	Outside = trophoblast Inside = embryoblast
How long does cleavage approximately take?	4 days
What does the trophoblast differentiate into?	Syncytiotrophoblast and cytotrophoblast
What does the embryoblast differentiate into?	Hypoblast and epiblast
What cells surround the definitive yolk sac?	Hypoblast cells
What is the membrane called that surrounds the primary yolk sac?	Heuser's membrane
After gastrulation what are the three germ layers called?	Endoderm Mesoderm Ectoderm
What are the main mesoderm components called that fold in the horizontal plane during folding of the embryo?	Laterally body wall folds
The appearance of what structure prompts gastrulation to begin?	Primitive streak

Resource summary

	Created by Tara McLaughlin over 6 years ago