From Week 9 until birth, the developing human is known as a . The fetal stage focuses on the rapid growth and maturation of the structures already formed. This period involves fine-tuning organ function and physical maturation, ensuring the individual is prepared for life outside the womb. Clinical and Scientific Significance Fetal Development: Week-by-Week Stages of Pregnancy
During this period, occurs, establishing the primitive versions of major organ systems. This stage is also the most vulnerable to teratogens , environmental factors like drugs or infections that can cause congenital malformations. Maturation and Growth: The Fetal Stage Download (01) embryologie humaine embryologie humaine pdf
Gives rise to the respiratory and digestive systems. From Week 9 until birth, the developing human is known as a
Human development begins with fertilization, the fusion of male and female gametes to form a single-celled . This initial phase, known as the germinal stage (Weeks 1–2), is characterized by rapid cell division called cleavage . As the zygote travels toward the uterus, it transforms into a morula and then a blastocyst , eventually implanting into the uterine wall. This critical "molecular conversation" between the embryo and the uterus is foundational for a successful pregnancy. The Blueprint of Complexity: The Embryonic Period Human development begins with fertilization, the fusion of
The study of human embryology is more than a branch of medicine; it is a fundamental exploration into the origins of human life, tracing the journey from a single cell to a complex, multi-organism being. The Foundation of Life: Conception and the Germinal Stage
Forms the nervous system, skin, and sensory organs.
Develops into the circulatory system, muscles, bones, and kidneys.