title: Neuro-anatomical feature photo: mesencephalon.
mesh_terms: D006801:Humans; D008636:Mesencephalon / Q000033:anatomy & histology*; D010487:Periaqueductal Gray / Q000033:anatomy & histology; D013378:Substantia Nigra / Q000033:anatomy & histology; D013477:Superior Colliculi / Q000033:anatomy & histology; D013681:Tegmentum Mesencephali / Q000033:anatomy & histology*; D014321:Trochlear Nerve / Q000033:anatomy & histology*