The stages of human development from a single cell to a whole being are very interesting. It has been widely studied and today the stages of human development are well documented. The development stages are divided into four. These are: germinal period, embryonic period, fetal period and full term or delivery (Kail and Cavanaugh 53). There is a wide variability in the features of the baby-to-be at the various stages of development.. The normal gestation period takes about 40 weeks (Charlesworth 169). After this a mature baby can be delivered. The germinal period, also known as the zygotic stage ...
Essays on Ectoderm
2 samples on this topic
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Introduction
Tooth development involves a complex process whereby teeth are formed from embryonic cells, and then eventually mature after erupting as evident in the mouth (Eckhardt, Jágr, Pataridis, & Mikšík, 2014). The development usually originates from mesoderm and ectoderm. At the ectoderm found in the oral cavity, there is the development of enamel and other tissues also come from associated mesenchyme. All teeth don’t develop at the same time, but rather in stages (Eckhardt, Jágr, Pataridis, & Mikšík, 2014). First buds are always observed in the region of anterior mandible, followed by anterior maxillary area then finally ...