Examlex
There are seven cervical, twelve thoracic, and five lumbar vertebrae.
Fetus
A stage in human development inside the womb from the end of the embryonic stage or the ninth week after fertilization until birth.
Germinal Stage
The Germinal Stage is the initial phase of prenatal development, occurring in the first two weeks post-conception, where the zygote divides and implants in the uterine wall.
Prenatal Development
The progression from fertilization to delivery involving the increase and maturation within the uterus.
Umbilical Cord
A tube-like structure that connects an unborn baby to the placenta, providing oxygen and nutrients while removing waste products.
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