embryology 1

how many chromosomes does zygote create

46

how many cells is morula

32

blastocyst formation

cells differenctionare cells move to outer edfe , fluid filled center

trophoblast

superficial layer of cells

embryo implantation

chromosome errors , quality and position

uterine implantation

doesnt reach uterus, shape of uterus

systemic implantation

mother immune system destroys embryo, lifestyle

epiblast ( bilaminar)

oriented to dorsal surface located toward endometrial layer

hypoblast bilaminar

oriented ventra hollow are of oterus

endoderm

develops first ventral surface, displaces hypoblast

mesoderm

middle layer

ectoderm

epiblast become ectoderm on dorsale surface

ectoderm becomes

epidermis of skin and nervous

mesoderm becomes

dermis of skin, muscles, heart, kidneys

endoderm becomes

digestive, respiratory, urinary and reproductive, endocrine glands

4 adult tissues

nervous, epithelial, muscle, connective

epithelial

one or more layers tight, protect internal and external surfaces in or out

connective

loosely arranged , diverse grp of tissue, mesoderm