Week 6 During Week 6 of pregnancy, or 4 weeks after conception, the neural groove down the center o...
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Week 6 During Week 6 of pregnancy, or 4 weeks after conception, the neural groove down the center of the embryo closes like a zipper, forming a tube that becomes the spinal cord and brain. The closing is faster toward the head end as the different parts of the brain develop. The ends of the groove then close. The heart now beats and pumps blood. Other organs and facial features are becoming more defined. Tiny buds appear that will become arms and legs. The embryo starts to take on the shape of a C; its skin is so thin, it is transparent. It is about an eighth of an inch long.

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