Examlex
The human circulatory system
Ectoderm
The outermost layer of cells in the early embryo from which the nervous system, skin, and other external tissues develop.
Proximodistal Development
A pattern of development where growth starts at the center of the body and moves towards the extremities, observed in the physical development of children.
Fingernails
Keratin-based structures at the tips of the fingers that protect the fingertip and enhance tactile sensation.
Fetus
A prenatal human between its embryonic state and birth, specifically after the major structures have begun to develop in the ninth week of pregnancy.
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