Early development of embryo and fetus Flashcards
When can fetal heart tone be heard with a stethoscope
Wk 22
Categories of the decidua
Decidua basalis
Decidua capsularis
Decidua vera or parietalis
Which trophoblast secrete hcg
Cytotrophoblast
Name of part of villi im contact with decidua basalis
Chorion frondosum
Which two structures form the placenta
Decidua basalis
Chorion frondosum
Composition of the centre of Chorionic villus
Mesoderm
Fetal vessels
Branches of umbilical artery and vein
They are covered by cyto and synctio
At what week is the placenta fully formed
week 12
Functions of placenta
FRESPEN
Which glands arise from ectoderm
Adrenal medulla
Posterior pituitary
Pineal
Which glands arise from mesoderm
Adrenal cortex
Gonads
Which glands arise from endoderm
Thyroid
Parathyroid
Anterior pituitary
Thymus
Anatomical variations of placenta
Succenturiate lobe
Circumvallate placenta
Bipartite placenta
Tripartite placenta
Where is the umbiical cord derived from
Embryonic stalk
Composition of umbilical cord
- 2 arteries
- The left umbilical vein
- Fetal connective tissue called Wharton’s jelly
- The tip of allantoic diverticulum
define long and short cord
long - 100cm
short - <30cm
Abnormalities of cord..define
True knots
Single artery
Battledore insertion
Velamentous insertion
Fetal sac consists of and where they are derived from
Outer chorion - from trophoblast
Inner amnion - inner cell mass
Amniotic volume for oligo and polyhydramnios
oligo - <500mls
poly - >2L
Watch video of fetal circulation
yeah
At what day does the inner cell mass develops into a bilaminar germ layer
Day 8 -9
When do kidneys begin to make urine
14 weeks
When can fetal sex be identified on ultrasound
20 weeks
When does fetal kicks begins and hair and nails begin to grow
18 weeks
Which trophoblast secretes proteolytic enzymes that create numerous filled cavities in the decidua called lacunae
Syncytiotrophoblast
