Structure of the nervous system Development of the nervous system The spinal cord or medulla spinalis The brain or encephalon The hindbrain or rhombencephalon The midbrain or mesencephalon The forebrain or prosencephalon Composition and central connections of the spinal nerves Pathways from the brain to the spinal cord The meninges of the brain and medulla spinalis The cerebrospinal fluid The cranial nerves The olfactory nerves The optic nerve The oculomotor nerve The trochlear nerve The trigeminal nerve The abducent nerve The facial nerve The vestibulocochlear nerve The glossopharyngeal nerve The vagus nerve The accessory nerve The hypoglossal nerve The spinal nerves The posterior divisions The anterior divisions The thoracic nerves The lumbosacral plexus The sacral and coccygeal nerves The sympathetic nerves The cephalic portion of the sympathetic system The cervical portion of the sympathetic system The thoracic portion of the sympathetic system The abdominal portion of the sympathetic system The pelvic portion of the sympathetic system The great plexuses of the sympathetic system