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(FRAME-INFO (STRING "Early Development \(Images adapted with permission from C. Kaiser after Hochstetter drawing in Hamilton, Boyd and Mossman. \"Human Embryology\", Williams & Wilkins Co.,  1972\). The nervous system develops from the hollow neural tube: the walls of the tube give rise to the brain and spinal cord while the cavity gives rise to the ventricular system. The neural tube first develops three bulges \(vesicles\): the prosencephalon, mesencephalon and rhombencephalon.  Later, the prosencephalon gives rise to the telencephalon or forebrain \(cerebral cortex, olfactory bulb and basal ganglia\) and diencephalon \(thalamus, hypothalamus and retina\). The mesencephalon forms the midbrain. The rhombencephalon gives rise to the metencephalon \(cerebellum and pons\) and the myelencephalon \(medulla\). The neural tube caudal to the myelencephalon forms the spinal cord. The cervical and pontine flexures eventually straighten out, but the midbrain flexure remains in the adult resulting in the forebrain being approximately at a right angle to the brain stem."))
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