Final answer:
The dental lamina begins to develop around the sixth week of embryonic development, a time when critical structures and organ systems are also forming. It is a sensitive stage where the embryo can be significantly affected by genetic defects or environmental factors.
Step-by-step explanation:
The development of the dental lamina begins during the embryonic stage of human development. Specifically, the dental lamina starts to form around the sixth week of embryonic development. At this time, the embryo undergoes significant changes, including the formation of the primary germ layers and the beginnings of major organ systems during a process known as organogenesis.
During weeks five through eight of embryonic development, there are critical developments occurring including limb and digit formation; the formation of ears, eyes, and other facial features; and the establishment of the fundamental structure for future sex organs. Additionally, during this period, the dental lamina, which is the precursor to teeth, starts its development, although the emergence of teeth themselves will not occur until several months after birth.
The embryonic stage is crucial because it is during this period that the foundation for all organ systems is laid down. This is also a sensitive period where genetic defects or harmful environmental exposures can have severe effects on fetal development.