Brain or encephalon (sagittal section): Seat of mental capacities of a human.
Septum pellucidum: translucent partition between two cavities.
Fornix: an arched body in the brain.
Interthalmic commissure: region of the thalamus.
Pineal gland: epyphysis.
Aqueduc of Sylvius: canal that connects the third ventricle to the fourth one.
Cerebellum: nervous centre situated under the brain.
Fourth ventricle: fourth cavity of the brain.
Brain stem: part of the brain consisting of the medulla oblongata, the pons Varoli and the mesencephalon.
Medulla oblongata: lower part of the brain stem.
Pons: projecting central part of the brain stem.
Mesencephalon: upper part of the brain stem.
Mammillary body: nipple-shaped part of the brain.
Hypophysis: gland situated under the brain which secretes hormones controlling most basic body functions.
Optic chiasma: the crossing of the optic tracts in the brain.
Anterior commissure: fascia of white substance related to the olfactory tracts.
Corpus callosum: substance joining the two hemispheres.