Fetal Periods Flashcards
Gender can be identified by experienced examiners
14
Uterus just palpable above SP
12
Quickening felt by some mothers (multiparas)
16
Heartbeat heard in almost all mothers
19
Quickening in all mothers
20
90% chance of survival
28
Testes starts to descend
32
Spontaneous movements
12
Fetal determination with this method is only used during the 1st trimester
Crown Rump Length
Fetal determination with this method is used during the 2nd and 3rd trimester
BPD
Greatest transverse diameter of the head
Bitemporal
Head diameter corresponding to the greatest circumference
Occipitofrontal
Genetic sex is determined by
Presence of Y chromosome
Phenotypic sex determined by
Hormones produced
Gonadal sex
Determined by SRY gene