LCN topic 4

• fertilisation/conception

• union of an ovum / egg
  by a sperm

implantation

• stage of development in which zygote embeds itself in the wall of uterus and begins to develop, occurs during first 2 wks after conception

embryo

• 2 - 8 wks after conception

• fetus

• unborn baby from 8 wks until term

placenta

• organ that develops in the uterus during pregnancy. The placenta attaches to the wall of the uterus, and the baby's umbilical cord arises from it

gestation

• period from conception to birth; for human beings, gestation lasts from 38 - 42 weeks & is commonly divided into three periods called trimesters.

• 
  

gestational age

• stage of fetal growth & development at birth, varying from premature to full term or post term

trimester

• three periods into which a normal pregnancy is divided arbitrarily for purposes of discussion & analysis

first trimester

week 1-12

second trimester

week 13 to 27 (15 weeks)

third trimester

week 28 to birth (13 weeks if birth is at 40 weeks)