Embryogenesis (Chapter 4) Flashcards
Genetic sex is determined when?
During fertilization (XY or XX)
Phenotypic sex is determined when?
Later in the embryo’s life
What is differentiation when we talk about cells?
It is the changing of an unidentifiable cell into a identifiable cell
What does the inner cell mass go on to become?
The fetus
3 components that come from the endoderm
- Digestive system
- Lungs
- Endocrine system
4 components that come from the mesoderm
- Reproductive system
- Muscle
- Skeleton
- Cardiovascular system
3 components that come from the ectoderm
- Nervous system
- Skin
- Hair
What 3 components make up the inner cell mass
- Ectoderm
- Mesoderm
- Endoderm
The infundibulum becomes the (posterior/anterior) lobe of the pituitary
Posterior
Rathke’s pouch becomes the (posterior/anterior) lobe of the pituitary
Anterior
The pituitary gland originates from the ___ and from the ___ of the ___
Brain
Roof of the mouth
Yolk sac
Location where the germ cells (testies/ovaries) start
Starting from the ___ the germ cells will migrate to the ___
Yolk sac
Urogenital ridge
Most major developments happen (early/late) in pregnancy
Early (1st trimester)
Which species of animal can have testicular decent after parturition?
Colt
The development of male/female gonads happens during which trimester?
Right before the 2nd trimester
In the early stages of development the ___ acts as a rudimentary kidney
Mesonephros
In the male fetus the remnant mesonephros will go on to become the ___
Efferent ducts
In the male fetus the ___ will go on to become the epididymus
Mesonephric duct
In the early stages of fetal growth the gonads are considered to be ___
Bipotential (either testies or ovaries)
