Lecture 6 - Embryonic Regions Flashcards
Which weeks?
Head is half of fetus
Face is broad with wide eyes and low set ears
External genitalia become mature and able to be determined by ultrasound
Urine (cyclical)
Weeks 9-12
Which weeks?
Limb movements are apparent
Bones become visible
Slow eye twitching
Head becomes more proportionate
Weeks 13 to 16
Which weeks?
Growth slows a bit Fetal movements felt by mother Vernix caseosa formed Lanugo Brown fat formation
Weeks 17 to 20
Which weeks?
Substantial weight gain
Lung surfactant is formed
Fingernails formed
Eyelids open
Weeks 21 to 29
Why are chances of survival lower before week 25 and higher after week 26?
because lung surfactant doesn’t develop until week 24
what does lung surfactant do?
decreases surface tension on lung alveoli (keeps them from collapsing)
what week do eyelids open?
week 26
What weeks?
Pink and chubby
Head and abdomen circumferences are equal
Weeks 30 - 38
What are CRL and CRH
Crown-rump length and Crown-heel length
measured by ultrasound
hollow needle enters mother’s anterior abdominal wall through the uterine walls and punctures amniotic sac
amniocentesis
what can amniocentesis detect?
infection
sex determination
some chromosomal abnormalities
biopsy of chorionic villi to detect chromosomal abnormalities
chorionic villus sampling
how does exchange happen in chorionic villi
spiral arteries shoot blood into intervillus space, where it runs down the walls of the space and gas exchange happens
poorly oxygenated blood leaves fetus through _______
oxygen rich blood is carried to fetus by _______
umbilical arteries (2)
umbilical vein (1)
what is oligohydraminos
low volume of amniotic fluid
can result in fetal abnormalities
