Unit 2- Fetal development (development of fetus)

Pre-embryonic stage (zygote)

days 1-14

Mitosis development

cleavage → blastomere → trophoblast

By 5th day:

blastocyst and trophoblast

Migration to uterus in _____ days

3-4

Implantation between ________ days

and called what

5th - 10th

nidation

trophoblasts secrete _______ to digest _____________

enzymes; maternal capillaries

New address after 14th day:

Decidua

Decidua secretes __________ to nourish ___________

glycogen and lipids to nourish zygote

*Termed “embryo” from _____________ to ____ weeks

Implantation; 8

Ectoderm definition

(outer layer)

skin, hair, eyes, ears, teeth, nails, and nerves

Mesoderm definition

(middle layer)

musculoskeletal, connective tissue, circulatory, lymphatic and uro-genital systems

Endoderm definition

(innermost layer)

linings of respiratory, digestive, urinary and vaginal tract

placenta begin to develop in ___ week at the ___________ site

3rd; implantation

_________ cells grow into uterine lining

trophoblastic

Extensions of trophoblasts are called

chorionic villi

Amnion=

inner membrane

amniotic fluid consists of

polyhydramnios

oligohydraminos

amnion functions

movement

muscular development

thermoregulation

breathing

practice respirations

prevent sac from sticking to fetus

helps dilate cervix

Umbilical cord consists of

wharton’s jelly

AVA (1 vein 2 arteries)

umbilical vein is oxygenated or deoxygenated?

& umbilical artery?

vein: oxygenated

artery: deoxygenated

placental functions

O2 and CO2 exchange

Nutrition

Excretion

Storage (protein, carbs, calcium, iron)

Endocrine (hormones)

*Fertilization -

pre-embryonic stage (zygote)- mitosis, differentiation

*Implantation -

• Trophoblast: chorionic villi (chorion)

• Embryonic disc: embryo and amnion