This page is a link to images from a 10 week female fetus approximately 40 mm in size.
This stage of development is after the embryonic period (up to week 8), but only 2 weeks into early fetal development.
The fetal period is a time of extensive growth in size and mass as well as differentiation of organ systems established in the embryonic period. In particular, the brain continues to grow and develop, the respiratory system differentiates, the urogenital system further differentiates between male/female, endocrine and gastrointestinal tract begins to function.
Compare this 10 week fetus with the earlier Carnegie stage embryos: size, head/body proportions, brain, head, skeletal development.
Note that in the early fetus the midgut remains herniated and will only be taken into the peritoneal cavity on further body wall growth.
This is an enlarged image of the actual size comparison shown in the introduction of the Embryonic stage 13, 23 and Fetal stage 10 week 40mm.
There are 4 sections taken in the sagittal plane (moving from the right at Plane A towards the midline at Plane D). Click on the small images (or the text below) to open the linked large image pages.