Summary
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1.
Each paired ganglion of Helix pomatia is supplied by symmetrically arranged branches from the anterior aorta. Capillaries from these branches open into a blood space which is adjacent to, and continuous over the surface of the nervous tissue. Blood passes from this space through the epineural sheath into the body cavity sinuses.
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2.
With the electron microscope three tissue layers are seen separating the blood spaces from the neurons of each ganglion. These are (i) a luminal endothelium, (ii) a fibrous connective tissue layer which is mainly collagen and (iii) glial cells.
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3.
Both the luminal endothelium and connective tissue are freely permeable to uncharged particles of 100 Å or less.
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Pentreath, V.W., Cottrell, G.A. The blood supply to the central nervous system of Helix pomatia . Z. Zellforsch. 111, 160–178 (1970). https://doi.org/10.1007/BF00339783
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DOI: https://doi.org/10.1007/BF00339783