from Neuroanatomic Site Development
Published online by Cambridge University Press: 07 August 2021
In human pregnancy, the developing individual is considered to be an embryo until the end of the eighth week after fertilization of the ovum. After this time the individual is referred to as a fetus. Gestational age refers to the interval between the first day of the mother’s last menstrual cycle and the current date (e.g., the date of a sonogram or delivery). Gestational age is therefore post-fertilization age plus 2 weeks. A detailed consideration of human neuroembryology is beyond the scope of this book. The reader is referred to the many publications of O’Rahilly and Muller, including their masterful textbook (1).
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