Development Flashcards
What are the 2 main functions of the yolk sac?
- Early in development: source of nourishment
- Determines repro function
What is the reason for the abdominal viscera exposure in this rare & fatal congenital disorder?
Because there is a fissure in the ventral abdominal wall…
Schistosomus reflexus
{body cavities did not close properly}
What is the significance of polar bodies?
They remove extra chromosomes
& indicate that oocyte has resumed development
What organs are derived from mesoderm?
{ICM}
Skeleton
Muscle
Cardiovascular
Reproductive System
What organs are derived from endoderm?
{blastocoele}
Digestive system
Lungs
Endocrine system
What organs are derived from ectoderm?
{trophoblast}
Nervous system
Skin
Hair
Regarding the reproductive system derivations, what germ line are tissues/organs derived from that are cranial to the hymen?
mesoderm
caudal to hymen: derived from ectoderm
T or F:
Gonads {testes, ovaries}, uterus, cervix, cranial vagina, epididymis, ductus deferens, and accessory sex glands are all derived from ectodermal origin.
Umm… FALSE-O:
these are derived from MESODERMAL origin.
T or F:
Reproductive tract components including the vagina/vestibule, clitoris, & penis are derived from ectodermal origin.
True
Organize the following from innermost—>outermost tissue/layers:
allantois, embryo, endometrium, amnion, & chorion
embryo—>amnion—>allantois—>chorion—>endometrium
