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Anterior view of the human brainstem

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Legend:(1) Gyrus rectus; (2) olfactory bulb; (3) olfactory tract; (4) olfactory trigone (triangular widening of the terminal olfactory tract located superior to the anterior clinoid process and directly rostral to the anterior perforated substance); (5) anterior perforated substance; (6) orbital gyri; (7) optic chiasm; (8) optic tract; (9) optic chiasm; (10) optic nerve; (11) infundibulum; (12) mammillary bodies; (13) posterior perforated substance; (14) interpeduncular fossa; (15) cerebral peduncles; (16) pons; (17) basilar sulcus; (18) cerebellar peduncle; (19) medullopontine sulcus; (20) inferior olive; (21) pyramid of medulla oblongata; (22) medulla oblongata, ventral median fissure; (a) thalamus; (b) mesencephalon; (c) pons; (d) medulla oblongata. (Source: John A Beal PhD, Department of Cellular Biology & Anatomy, Louisiana State University Health Sciences Center, Shreveport, Louisiana. Creative Commons Attribution 2.5 Generic [CC BY 2.5] license, creativecommons.org/licenses/by/2.5. Legend relabeled by Dr. Douglas J Lanska.)