Human brainstem anterior view

1. Gyrus rectus
2. Bulbus olfactorii
3. Tractus olfactorii
4. Trigonum olfactorium
5. Substantia perforata anterior
6. Gyri orbitales
7. Gyrus parahippocampalis
8. Tractus opticus
9. Chiasma opticum
10. Nervus opticus
11. Infundibulum hypophysialis
12. Corpora mammillaria
13. Substantia perforata posterior
14. Fossa interpeduncularis
15. Pedunculus cerebri
16. Pons
17. Sulcus basilaris
18. Pedunculus cerebelli
19. Sulcus bulbopontinus
20. Oliva
21. Pyramis medullae oblongatae
22. Medulla oblongata, Fissura mediana anterior

A: Thalamus, B: Mesencephalon, C: Pons, D: Medulla oblongata

The Medulla, Pons & Midbrain are delineated here on the anterior surface of the brain.

In the Midbrain the massive right and left Cerebral Peduncles are seen. The two peduncles are separated by the Interpeduncular Fossa. Posteromedial central arteries enter the brain through the holes in the Posterior Perforated Substance located in the floor of the fossa. Cranial nerve III also enters the midbrain through this fossa.

Another important fact to note is that the pituitary gland was removed before this photo was taken. The infundibulum connects between the thalamus and pituitary.