1. Human Embryo: 53 days, 26mm CRL
2. Human Embryo: 53 days, 27 mm CRL
3. Human Fetus :9 weeks, 35 mm CRL
4. Human Fetus : 9.5 weeks, 48.5 mm CRL
5. Human Fetus : 10 weeks, 56 mm CRL
6. Human Fetus: 12.5 weeks, 88.5 mm CRL
Click on the images to view the videos
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1. Human Embryo: 53 days, 26mm CRL |
2. Human Embryo: 53 days, 27 mm CRL |
3. Human Fetus :9 weeks, 35 mm CRL |
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4. Human Fetus : 9.5 weeks, 48.5 mm CRL |
5. Human Fetus : 10 weeks, 56 mm CRL |
6. Human Fetus: 12.5 weeks, 88.5 mm CRL |
These videos are taken from the studies of Hooker (1952, 1958) and Humphrey (1964) on the appearance of human reflexes resulting from cutaneous stimulation. After removal from the uterus the living embryos and fetuses were placed in a warm biological solution under a motion picture camera and touched in various places with a hair. The reflex responses were recorded on 16 mm motion picture film. Crown-rump lengths (CRL) were used to determine estimated post fertilization ages.
Hooker, D. (1952) The Prenatal Origin of Behavior. University of Kansas Press, Lawrence. Chapter II, pp. 54-86
Hooker, D. (1958) Evidence of prenatal function of the central nervous system in man. The American Museum of Natural History. New York.
Humphrey, T. (1964) Some correlations between the appearance of human fetal reflexes and the development of the nervous system. Prog. Brain Res., 4:93 - 135.