The cephalic end of the neural groove exhibits several dilatations, which, when the tube is closed, assume the form of three vesicles; these constitute the three primary cerebral vesicles, and correspond respectively to the future fore-brain ( prosencephalon ), mid-brain ( mesencephalon ), and hind-brain ( rhombencephalon ).
12.
The anterior ( or'rostral') portion of the neural tube initially differentiates into three brain vesicles ( pockets ) : the prosencephalon at the front, the mesencephalon, and, between the mesencephalon and the spinal cord, the rhombencephalon . ( By six weeks in the human embryo ) the prosencephalon then divides further into the telencephalon and diencephalon; and the rhombencephalon divides into the metencephalon and myelencephalon.
13.
The anterior ( or'rostral') portion of the neural tube initially differentiates into three brain vesicles ( pockets ) : the prosencephalon at the front, the mesencephalon, and, between the mesencephalon and the spinal cord, the rhombencephalon . ( By six weeks in the human embryo ) the prosencephalon then divides further into the telencephalon and diencephalon; and the rhombencephalon divides into the metencephalon and myelencephalon.
