Central nervous system of the 10-mm embryo. Arrows indicate the position of the cephalic, pontine and cervical flexures.
Keywords: cephalic flexure, cerebral vesicle, cervical flexure, chiasmal area, diencephalon, isthmus, lamina terminalis, mamillary area, mesencephalon (midbrain), metencephalon (rhombencephalon), myelencephalon (rhombencephalon), neurohypophyseal bud, optic stalk (CN II), pons area, pontine flexure, pre-optic area, primitive filum terminale area, rhombic lip (cerebellum), roof of rhombencoel (fourth ventricle), spinal cord, telencephalon
Source: Atlas of Human Embryos.