Create an account
Any agent or stubstanch which can cause developmental abnormalities in the embryo or fetus
Types of teratogens
Possible effects of a teratogen
No appaarent consequence
Abnormal growth in an organ system
Drug that was first invented and marketed as a sleeping pill and later prescribed topreven miscarriage. It was widely distribued in Europe and Australia
Abnormalities caused by thalidomide
Almost complete absence of limb development. Humerus/radius/ulna severely shortened and hands almost directly attached to shoulder joint
Fetal alcohol syndrome (FAS)
General term for the collective disorders caused by alcohol consumption during pregnancy.
Clinical signs of FAS
Mild to severe devoleopmental delays
Craniofacial abnormalities (eg, microecephaly and visual impairments)
Eyes may fail to develop (severe cases)
Reason oxygen delivered to embryo is reduced when mother smokes during pregnancy
The carbon monoxide in the smoke binds to the iron in hemoglobin ~300 times more strongly than oxygen
Increased risks to the baby from smoking during pregnancy
Miscarriages (spontaneous abortions)
Low birth weight
SIDS (sudden infant death syndrome)
Premature separation of the placenta from the wall of the uterus. This causes severe hemorrhage to both mother and fetus
Abnormal placement of the placenta: Dangerously close to cervix or may completely overlap cervix
Effects to newborns from mothers smoking marijuana during pregnancy
Increased startle reflex
Risks from vasoconstriction of the uterine smooth muscle during pregnancy
Intrauterine growth retardation
Consequence of newborns born to mothers that used cocaine or herion during pregnancy
Various neurobehavioral abnormalities
Effects of microbes that infect embryos/fetuses
Microbes most likely to harm embryos/fetuses in the US
Possible effects of lower doses of ionizing radiation on developing babies
Effects of radiation during embryonic and fetal development
Increased incidence of cancer during later life
Population that has a greater than normal incidence of childhood and other cancers
Survivors of radiation exposure
Diseases and conditions of the mother that could affect the developing embryo/fetus
Reason low to moderate levels of a teratogen may cause no abnormalities to the embryo during the first 2 weeks of life
Still traveling down the fallopian tube to the uterus and has not, yet, embedded into the endometrial wall so there is not a connection between the maternal and fetal circulatory systems
Embryonic development during weeks 2-5 of pregnancy
Rapid development of central nervous and circulatory systems. Development of eye and limb buds
Systems and organs effected by teratogens during weeks 4-7 of pregnancy
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together