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  • Title: Localization of NADPHd-exhibiting neurons in the spinal cord of the rabbit.
    Author: Marsala J, Marsala M, Vanický I, Taira Y.
    Journal: J Comp Neurol; 1999 Apr 05; 406(2):263-84. PubMed ID: 10096610.
    Abstract:
    Segmental and laminar distributions of nicotinamide adenine dinucleotide phosphate diaphorase (NADPHd)-exhibiting neurons were examined in the rabbit spinal cord by using horizontal, sagittal, and transverse sections. A large number of NADPHd-positive neurons in the spinal cord of rabbit appeared to fall into six categories (N1-N6), but others could not be classified. Major cell groups of NADPHd-exhibiting neurons were identified in the superficial dorsal horn and around the central canal at all spinal levels and in the intermediolateral cell column at thoracic and upper lumbar levels. NADPHd-exhibiting neurons of the pericentral region were divided into 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 NADPHd-exhibiting neurons with long dendrites radiating in the transverse plane. In the pericentral region (lamina X), close association of NADPHd-exhibiting somata and fibers and mostly longitudinally oriented blood vessels were detected. Neurons of the sacral parasympathetic nucleus, seen in segments S1-S3, exhibited prominent NADPHd cellular staining accompanied by heavily stained fibers extending from Lissauer's tract through lamina I along the lateral edge of the dorsal horn to lamina V. A massive dorsal gray commissure, highly positive in NADPHd staining, was found in segments S1-S3. Scattered positive cells were also found in the deeper dorsal horn, ventral horn, and white matter. Fiberlike NADPHd staining was found in the superficial dorsal horn and pericentral region in all the segments studied. Dense, punctate, nonsomatic NADPHd staining 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), Onuf's nucleus (segments S1-S3), and the dorsal part of the dorsal gray commissure (S1-S3).
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