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Carnegie Stage 3 - First Trimester
Spontaneous Movement Begins.




•••••

SIZE: 15.0 - 20.0 mm

TIME PERIOD: 51 - 53 days post-ovulation


Head and Neck
Brain is connected to tiny muscles and nerves and enables the embryo to make spontaneous movements. The scalp plexus is now present. Nasal openings and the tip of the nose are fully formed.

Pelvis
Anal membrane is perforated. Urogenital membranes differentiate in male and female embryos. Testes or ovaries are distinguishable.

Limbs
The upper limbs become longer and continue to bend at the elbows and extend forward. Skin on the foot plate folds down between the future toes, each distinguishable from the other
.
nd get stronger.

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