Embryology Flashcards
what time frame is considered embryo
3-8 weeks
what time frame is considered a fetus
9 weeks until birth
gastrulation
when embryo turns from one dimensional to multilayered gastrula
morula has how many cells
16 cells
blastocyst has how many cells
70-100
blastocoel
cavity formed after 1 week
what 2 cell types make up blastocyst
trophoblasts (outer wall) and embryoblasts (inner wall)
ectopic pregnancy + symptoms
egg embeds itself into the fallopian tube
symptoms: lateral pelvic pain, bloody discharge, bowel/bladder changes
what cells are prominent in week 3 of gastrulation
epiblasts and hypoblasts
when does the 2 layered cell become 3 germ layers
week 3 of gastrulation
primitive streak
where cells differentiate and migrate to form a middle mesodermal layer
what are the 3 germ layers
endoderm
mesoderm
ectoderm
what germ layer does the nervous system arise from
Endoderm
what germ layer does PT typically work with
mesoderm
