The upper half of this midsagittal section through the head extends from the lips and incisor tooth on the right through the nasal cavity and its sinuses to the trachea, immediately above which is the brain. The homogeneous pink cerebral cortex contrasts with the arbor vitae or “tree of life” appearance of the dark blue cerebellum at the posterior brain, at left. The small triangular structure immediately below the posterior cerebral cortex is the pituitary gland. The pink triangle includes the intermediate lobe and neurohypophysis, which lie on top of the horizontal dark, anterior lobe. The lower jaw includes a tooth and overhanging tongue.