Four<unk>  subdivisions each eventually develop into distinct regions of the central nervous system by the division of neuroepithelial cells: the forebrain (prosencephalon), the midbrain (mesencephalon), the hindbrain (rhombencephalon) and the spinal cord. * The prosencephalon further goes on to develop into the telencephalon (cerebrum) and the diencephalon (the optic vesicles and hypothalamus). * The mesencephalon stays as the midbrain. * The rhombencephalon develops into the metencephalon (the pons and cerebellum) and the myelencephalon (the medulla oblongata). For a short time, the<unk>  is open both cranially and caudally. These openings, called neuropores, close during the fourth week in humans. Improper closure of the neuropores can result in<unk>  defects such as anencephaly or spina bifida. The dorsal part of the<unk>  contains the alar plate, which is associated primarily with sensation. The ventral part of the<unk>  contains the basal plate, which is primarily associated with motor (i.e., muscle) control.
Neural tube
Embryoid body
Cervical cap
Embryocardia
Germinal matrix
Breast shell
Wound
Kidney dish