Coding 14 Flashcards
When does the embryo embed in the uterus?
The blastocyst stage
Does the brain form before birth?
No
What is the conceptuous?
The stage from the zygote to birth at 8-weeks it becomes the embryo
How does implantation occur?
When the embryo attatches to the uterus and burrows in the uterus epithelium
What is a trimester?
3-months of the process of birth development
What forms the sperm and egg (primordial germ cells)?
The posterior epiblast cells
What is the gonocyte?
When the primordial germ cells divide
What separates the follicles?
A mesenchymal called the theca
What is the primary follicle?
When the oogonium is coated in epithelium
When follicle cells divide what does that make?
Granulosa
What happens when the oocyte is coated by the epithelium?
Primary follicles and oocytes
What happens when the primary oocyte releases signal to continue dividing?
Makes the secondary follicles
What is the lutenizing hormone?
Stimulates oocyte division to become the secondary oocyte
What is the corpus leteum?
Follicle cells in the ovary that make progesterone
What does the sperm cytoplasm do?
Activates the egg cytoplasm
What does the embryo depend 3-days after fertilization?
Maternal effect genes
When does MZT occur?
8-cell stage
What is the endometrium?
The layer that is shedding during the menstrual cycle and it catches the embryo but also it is the inner layer of the uterus
What is the bilaminar germ disc?
The inner cell mass that consists of the upper epiblast and lower hypoblast
What does the epiblast make?
The amnion
What does the hypoblast make?
The yolk sac
What makes the placenta?
The mesoderm and the epiblast cells
What is infertility?
It can occur in males where they lack healthy sperm or for females the egg fails to embed in the uterus
What is pleiotropy?
The effect to the same tissue but different effects following mutations in the same gene
What is genetic heterogeneity?
Similar phenotype by mutation to different genes
What is phenotypic heterogeneity?
Same mutation can make a different phenotype
What are tetrogens?
Exogenous agents that can cause congential anomolies
