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FIG 6. Oblique coronal MR images.
A, Oblique coronal T2-weighted image obtained through the level of the posterior commissure from a control subject, 58-year-old woman. Hypointense areas are visible at the red nucleus (r) and in the area including the medial half of the crural fibers and the anterior part of the SN (arrow). An area of hyperintense gray matter suggestive of the SN is not shown.
B, Oblique coronal fast STIR MR images obtained at the same section as in A. The SN (n), crural fibers (c), and red nucleus (r) with surrounding white matter are readily identified. Almost the entire margin of the SN is clearly identified. The outline indicates the measured area.
C, Corresponding oblique coronal section of the human specimen. The SN (n) is identified as a crescent gray matter structure located posterior to the crural fibers (c) and anterolateral to the red nucleus (r).
D, Oblique coronal T2-weighted image through the level of the superior colliculus obtained in the same subject as in A. The hypointense area is depicted at only the anteromedial aspect of the crus cerebri (arrow). A hyperintense area suggestive of the SN is not identified.
E, Oblique coronal fast STIR image obtained at the same section as in D. A bandlike structure with hyperintense gray matter that represents the SN (n) is depicted posteromedial to the hypointense crural fibers (c). The outline indicates the measured area.
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