This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Gray. Axial section through midbrain Schematic Testut Corpora quadrigemina Cerebral aqueduct Central gray stratum Interpeduncular space Sulcus lateralis Substantia nigra Red nucleus of tegmentum Oculomotor nerve with its nucleus of origin Lemniscus in blue with the medial lemniscus and the lateral lemniscus Medial longitudinal