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  • Title: Reduced nicotinamide adenine dinucleotide phosphate diaphorase in the spinal cord of dogs.
    Author: Marsala J, Vanický I, Marsala M, Jalc P, Orendácová J, Taira Y.
    Journal: Neuroscience; 1998 Aug; 85(3):847-62. PubMed ID: 9639278.
    Abstract:
    The distribution of somatic, fibre-like and punctate, non-somatic reduced nicotinamide adenine dinucleotide phosphate (NADPH) diaphorase activity was examined in dog spinal cord using horizontal, sagittal and transverse sections. The morphological features of NADPH diaphorase exhibiting neurons divided into six different neuronal types (N1-N6) were described and their laminar distribution specified. Major cell groups were identified in the superficial dorsal horn and around the central canal at all spinal levels, and in the intermediolateral cell column at thoracic level. NADPH diaphorase exhibiting neurons of the pericentral region were distributed in a thin subependymal cell column containing longitudinally-arranged small bipolar neurons with processes penetrating deeply into the intermediolateral cell column and/or running rostrocaudally in the subependymal layer. The second pericentral cell column located more laterally in lamina X contains large, intensely-stained NADPH diaphorase exhibiting neurons with long dendrites radiating in the transverse plane. Neurons of the sacral parasympathetic nucleus seen in segments S1-S3 exhibited prominent NADPH diaphorase activity accompanied by heavily-stained fibres extending from Lissauer's tract through lamina I along the lateral edge of the dorsal horn to lamina V. A massive dorsal gray commissure, with high NADPH diaphorase activity, was found in segments S1-S3. At the same segmental level a prominent group of moderately-stained motoneurons was detected in the dorsolateral portion of the anterior horn. Fibre-like NADPH diaphorase activity was found in the superficial dorsal horn and pericentral region in all segments studied. Punctate, non-somatic NADPH diaphorase activity was detected in the superficial dorsal horn, in the pericentral region all along the rostrocaudal axis and in the nucleus phrenicus (segments C4-C5), nucleus dorsalis (segments Th2-L2), nucleus Y (segments S1-S3), and the dorsal part of the dorsal gray commissure (S1-S3). A schematic diagram documenting the segmental and laminar distribution of NADPH diaphorase activity is given.
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