What time frame does the preembryonic period of development encompass?

The preembryonic period of development is defined as the time frame that spans from conception up to the end of the second week of pregnancy. This period includes critical events such as fertilization, cleavage (cell division), and the formation of the blastocyst. By the end of the second week, the blastocyst is implanted into the uterine lining, marking the transition into the embryonic period, which begins with the third week.

Understanding this timeline is essential for healthcare professionals as it lays the groundwork for fetal development and helps in determining the appropriate prenatal care and interventions needed throughout pregnancy.