Midbrain articles from across Nature Portfolio. Atom; RSS Feed; Definition. The midbrain (mesencephalon) consists of the tectum, tegmentum, substantia nigra, red nucleus, inferior and superior ...

Chiari Malformation Type II: (Left and Middle) T2-weighted axial MRIs; (Right) T1-weighted sagittal MRI. The axial scans show several abnormalities, including descent of the cerebellar tonsils, an ...

Chiari Malformation Type II: T1-weighted axial MRIs. These axial scans show several abnormalities, including descent of the cerebellar tonsils (tonsillar herniation), an abnormal midbrain with a ...