Kusakabe T, Ishii K, Ishii K
Department of Anatomy, Yokohama City University School of Medicine, Japan.
Anat Embryol (Berl). 1991;183(6):553-7. doi: 10.1007/BF00187904.
The anatomical structure of oxygen-sensitive receptors in branchio-cardiac veins of a crayfish (Astacus leptodactylus) was studied with fluorescence and electron microscopy. Fluorescent cells were observed in the wall of a restricted part of the branchio-cardiac veins which was electrophysiologically shown to be a chemoreceptor region. Electron microscopy disclosed that they were dense granule-containing cells, and form, together with supporting cells and nerve terminals, complex structures that show gross similarities with arterial chemoreceptor structures in vertebrates.