Conception: In a Nutshell (Nursing)

00:01 So let's summarize everything we've talked about in this module.

00:04 In a nutshell, the germinal stage begins with conception and ends after two weeks.

00:10 The embryonic stage picks up at the two-week mark and it ends at the end of eight weeks.

00:16 The fetal stage begins at nine weeks and it continues until the baby is actually born.

00:23 The trophoblast makes up the outer layer of the blastocyst and it becomes the chorionic villi.

00:30 The ectoderm will become parts of the baby that are related to sensory activity, while the mesoderm will become the structural things like bones and muscles and connective tissue.

00:41 The endoderm will become the epithelial lining and it lines the GI tract, things like that.

00:47 The type of twin formation is formed by when the cells divide and whether there's one zygote or two.

00:55 The chorion and the amnion are separate layers that are sealed together on the amniotic sac.

01:02 The decidua basalis will become the placenta.

01:06 Maternal and fetal blood never, never mix.

01:11 There are two arteries and one vein.

01:15 The placenta fulfills the function of the liver and the lungs.

01:20 Remember, placentas are awesome.

01:22 Oxygenated blood via the umbilical veins will mostly bypass the liver through the ductus venosus.

01:30 Oxygenated blood also bypasses the lungs via the foramen ovale.

01:36 Deoxygenated blood bypasses the lungs via the ductus arteriosus and it returns through the umbilical arteries.

01:45 We're done, you did it.

01:48 Remember, go back and review and you'll have it down perfectly.