Fertilization
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Conception
Secondary oocyte can be fertilizaed for abt 24 hrs after ovulation
Sperm Life time
can remain viable after 48-72 hrs within female reproductive tract 3 day window
Fertilization
Occurs in outer one thrid of fallopian tube, during this produce the membrane around the acrosome (sperm head) becomes fragile
Dizygote
Fraternal twins occur when two separate eggs are fertilizated
Monozygote
identical twins occur when a single egg is fertilized but dividing cells breaks into two groups
Zygote
undergoes rapid mitotic cell division
Blastocyst
Cell develop into hollow ball of cells
implantation
Blastocyst nourish by glycogen from glands of endometrium At abt 6 days after ovulation blastocyst impants in endometrium
Primary Germ Layer
Endoderm MesoDerm Ectoderm
Gestation period
First trimester zygote, morula, blastocyst after implantation becomes a embyro
Embryonic phase
last from fertilization til w8 of gestation when it becomes a fetus day 35 heart is beating, eye and limb are formed end of 3rd month placenta is functioning 4th month all organ systems are formed and functioning