Summary
The ventral median fissure of the medulla oblongata is in the rabbit occupied by a triangular interpyramidal glio-vascular region composed of astrocytic fibers, collagen fibers, fibrous astrocytes, rare neurons and myelinated nerve fibers, and moderate amounts of glycogen. The tissue is only sparsely vascularized, but the large median arteries to the raphe enter this region along its lateral borders.
A similar region varying slightly in structure was demonstrable in Marsupialia, Edentata, Rodentia, Lagomorpha, Carnivora and Primates. The length of the region varied, being smallest in rodents and largest in primates. No such region was demonstrable in the pigeon.
Aside from a mechanical action of securing the position of median arteries, the functional role of the interpyramidal glio-vascular region is conjectural.
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Cammermeyer, J. The interpyramidal glio-vascular region. Z. Anat. Entwickl. Gesch. 126, 332–341 (1968). https://doi.org/10.1007/BF00520798
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DOI: https://doi.org/10.1007/BF00520798