Fetal Period Flashcards
14 weeks AOG
Gender can be identified by experienced examiners
16 weeks AOG
Lanugo starts to appear
Quickening can be felt by some mothers
Fetal CRL is 12
Gender can be determined by experienced observers by inspection of the externwl genitalia by 14 weeks
Quickening by multiparas
19 weeks AOG
Heart beat can be heard in almost all mothers
Nails start to form
20 weeks AOG
Downy lanugo hair covers the entire body
Start of vernix caseosa
Quickening in just about all patients
Fetus now weighs somewhat more than 300grams and weight begins to increase in a linear manner
Fetus moves about every minute and is active 10 to 30 percent of the time
Downy lanugo covers its entire body
28 weeks AOG
Skin is red and covered with vernix caseosa
90% chance of survival
Baby starts opening and closing eyes
Crown-rump length is approximately 25cm
Pupillary membrane has just disappeared from the eyes
Born at this age has a 90% chance of survival
32 weeks AOG
Testes start to descend
34 weeks AOG
Lanugo starts to disappear
Replaced by mature hair
36 weeks AOG
Body has become more round because of fat deposition
CRL of 32
Deposition of subcutaneous fat
40 weeks AOG
Testes in the inguinal canal or in the scrotum
Average crown-rump length is about 36cm
Weight is approximately 3400grams
12 weeks AOG
Uterus just palpable above the SP
Begins breathing movements
Gonadal gender has differentiated but cannot be identified yet
The uterus usually is just palpable above the symphysis pubis, crown-rump-length is 6 to 7 cm
Centere of ossification have appeared in most of the fetal bones
Fingers and toes have become differentiated
Skin snd nails have developed and scattered rudiments of hair appear
External genitalia are beginning to show definitive signs of male or female gender
Spontaneous movements
24 weeks AOG
Canalicular perriod of lung developmentis nearly completed
Fat deposition begins
Fetus born at this time will attempt to breathe, but many will die because the terminal sacs have not yet formed