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Cross-section of the brain. Here the upper half of the brain is cut off, and you see the upper cut surface of the lower half. The outer shaded part is the gray matter, and the inner lighter area is the white matter. In the center is the corpus callosum, a type of white matter that connects the two hemispheres together.

Cross-Section of the Brain

Cross-section of the brain. Here the upper half of the brain is cut off, and you see the upper cut surface…

Section of a spinal cord, one half of which shows the tracts of the white matter, and the other half (right) shows the position of the nerve cells in the gray matter. 7, 10, 9, and 3 are tracts of descending degeneration, 1, 4, 6, and 8, of the ascending degeneration.

Section of the Spinal Cord

Section of a spinal cord, one half of which shows the tracts of the white matter, and the other half…

Diagrammatic representation of a transverse section through the spinal cord. The nerve tracts in the white matter and the clusters of the nerve cells in the gray matter are shown.

Transverse Section Through Spinal Cord

Diagrammatic representation of a transverse section through the spinal cord. The nerve tracts in the…

Transverse section through the white matter of the cord, as seen through the microscope.

White Matter of Spinal Cord

Transverse section through the white matter of the cord, as seen through the microscope.