- The embryo measures 8 mm (1/4 inch) in length.
- Lens pits and optic cups form the start of the developing eye. Nasal pits form.
- The brain divides into 5 vesicles, including the early telencephalon (cerebrum).
- Leg buds form and hands form as flat paddles on the arms.
- Rudimentary blood moves through primitive vessels connecting to the yolk sac and chorionic membranes.
To quote the lovely Aileen Birch, it's basically now a "space prawn"... awesome! Well, a space prawn with paddle hands - that's just cool!
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