F- Four-Month Fetus Purple Model

Embryo at 6 weeks- 12 mm long crown to rump, inhuman appearance

fetus at 8 weeks (most organs are formed and it is now called a fetus and has human appearance)

fetus at 10 weeks (40 mm long, holds head erect)

fetus at 12 weeks (sex can be seen, skeleton is ossifying, brain has general structure)

fetus at 14 weeks (yolk sac detaches and deteriorates)

fetus at 16 weeks, mother can feel movements

gravid uterus

cervix or neck of uterus

amnion or "water bag"

placenta

umbilical cord

vagina

vaginal orifice

labia minora

labia majora

urinary bladder

urethra

pubic symphysis

fornix of the vagina

sigmoid colon

rectum

anal canal

descending colon

Ileum (small intestine)

mesentery

linea alba

fifth lumbar vertebra

sacrum

coccyx bone

cauda equina