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FIG 4. Histologic findings in cadaver corpora callosa
A, Perivascular fibrous alae on a sagittal celloidin 100-µm-thick section through the corpus callosum (alkaline phosphatase stain, cresyl violet acetate and light green counterstain). A large arteriole (black arrow) is obliquely sectioned, and the extent of the collagenous perivascular ala (white arrows) is seen in an artifactual gap in the tissue.
B, Axial celloidin 100-µm-thick section through the corpus callosum (alkaline phosphatase stain, trichrome counterstain). Collagenous (green) sheets (arrows) are contiguous with and extend laterally away from penetrating callosal arterioles. These alae descend through the corpus callosum in a curtain-like fashion. Note that the axons horizontally oriented in this section.
C, Sagittal paraffin 10-µm-thick section through the corpus callosum (Bielschowsky stain). Axons are stained black, and most are cut in cross-section and appear as black dots (as expected). Two small bundles of obliquely oriented axons (curved arrows) are depicted. Obliquely cut vessels and associated fibrous ala are seen in a tissue cleft (straight arrows).
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