Abstract
Contrary to the widespread assumption, the filum terminale in the rat possesses a precise glial and neuronal organization. The processes of glial fibrillary acidic protein-stained astrocytes form a rich, three dimensional array. The crescent shaped white matter could be outlined with antibody detecting oligodendrocytes. The neurons in the filum terminale, labeled with neuron-specific nuclear protein, are distributed in a small midline group (dorsal nucleus) dorsal to and in two symmetrical clusters at both sides of the central canal (lateral nuclei). Nitric oxide synthase-, calretinin-, choline acetyltransferase-, substance P- and neurokinin receptor-1-immunoreactive neurons were detected in the lateral nuclei. Axons were classified based on their course and termination. Small number of calcitonin gene-related peptide-immunoreactive fibers was found exclusively in the dorsal nucleus. Nitric oxide synthase-, substance P-, and neurokinin receptor-1-stained axon arborizations were detected mainly in the lateral nucleus. A dense array of extremely fine vesicular glutamate transporter 2- and fine, synaptophysin-immunoreactive varicosities covered densely the lateral nuclei. Fine glycine-transporter 2-immunoreactive axon arborization...Continue Reading
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