In the myenteric plexus of rat stomach, ileum, and rectum, glial cells outnumber nerve cells by more than 3 to 1; they have several processes, extensively branching, which extend between, and adapt themselves to, other cellular elements, constituting a very compact structure. The most prominent feature of glial cell cytoplasm are bundles of gliofilaments. No basement membrane surrounds individual glial cells; a single basement membrane is observed around the whole ganglion. Morphological

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... s do not support the identification of these cells as Schwann cells, but relate them to the central nervous system astrocytes.