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FIG 5. Subimages of the brain stem.
A, Coronal section (110 x 55-mm subimage) of the brain stem obtained at the level of the motor decussation. Fibers of the motor tract cross to the contralateral side at the level of the lower medulla.
B, Axial subimage (27.5 x 27.5-mm field of view) of the medulla obtained at the level of the motor decussation. Fibers of the motor tract cross to the contralateral side. Short lines with blue dots indicate low anisotropy.
C, Midsagittal subimage (55 x 55-mm field of view) of the brain stem. The pyramidal tract is shown in yellow and the medial longitudinal fasciculus in pink.
D, Sagittal section (55 x 55-mm field of view subimage) of the brain stem at a lateral position. Fibers of the pyramidal tract (yellow) enter the pons. The arrowheads indicate fine fibers of the sensory decussation (internal arcuate fibers), running in an anteroposterior direction.
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