Longitudinal section of the head (pictured here with pharyngitis or sore throat). Near the midline the cranial cavity is open and large parts of the brain are visible. Underneath the cerebrum we see corpus callosum, the vault, fornix and the ventral horns of the lateral ventricle and the septum pellucidum, which divides the ventricle. Part of the mid-brain is visible as a large core area of the thalamus. Located directly in front of the pituitary gland is the junction of the optic chiasm. The dorsal end of the diencephalon is the pineal gland. The cerebral aqueduct passes through the midbrain. The hindbrain consists ventrally of the bridge and the medulla oblongata and dorsally of cerebellum in front of the fourth from ventricle. With the facial bones the relative locations of nose, forehead and sphenoidal sinuses to the skull base and adjacent brain areas is important. The side wall of the nose septum is defined by three nasal conchae.