Intrapineal neurons and intracapsular and intrapineal myelinated fibers were studied by light microscopy in male cotton rats (Sigmodon hispidus) at various postnatal ages. Until 300 days of age, neurons are encountered mainly in the distal third of the organ; neuronal nuclei are largest in this region. The remaining regions contain only a few neurons with smaller nuclei. In all regions, nuclear...

87 Dear Editor, I read the photo essay titled “Unilateral Myelinated Retinal Nerve Fibers” with interest.[1] The authors reported a case of unilateral extensive myelination with amblyopia, with partial improvement after occlusion therapy. However, there was no comment about the status of the optic nerve head. Several reports have suggested that myelinated nerve fibers are associated with optic ...

Mechanosensitivity of afferent sympathetic nerve fibers from the right heart and the pulmonary artery has been examined. Action potentials of the afferent fibers that responded to tapping the right heart and the pulmonary artery were derived from upper thoracic communicating rami of both sides of anesthetized dogs. The fibers were composed of myelinated Adelta fibers and unmyelinated fibers. Th...

Previous magnetic resonance imaging (MRI) and diffusion tensor imaging (DTI) investigations have shown that the white matter volume and fractional anisotropy (FA) were decreased in schizophrenia (SZ), which indicated impaired white matter integrity in SZ. However, the mechanism underlying these abnormalities has been less studied. The current study was designed to investigate the possible reaso...

Twenty-four adult molly fish (Poecilia sphenops, Valenciennes 1846) were collected to study the morphology and distribution of ganglia using histological, immunohistochemical, electron microscopy focusing on their relation immune cells. The classified spatially into cranial spinal, functionally sensory autonomic. Spinal (dorsal root ganglia, DRG) contained large close ganglionic cells, enclosed...

203 Abstract: Semi-thin and thin sections were used to observe the morphogenesis of peripheral nerves regenerating in silicone tubes. The progress of peripheral nerve regeneration across a 10 mm gap within the silicone tubes was examined after 3, 6 and 9 months. The left sciatic nerves of rats were transected. The proximal and distal nerve stumps were inserted into a silicone tube, in which the...

In most mammals, the optic nerve fibers are myelinated in its extraocular part (EON) but not in its intraocular part (ION) and also in the retina. Transitional zone from the myelinated to unmyelinated optic nerve usually lies in the central part to the lamina cribrosa. It has been known that dogs contain exceptionally myelinated fibers in ION by light microscopy. The aim of this study was to in...

Transcutaneous stimulation of the auricular branch of the vagus nerve (ABVN) resulted in deactivation of temporal lobe structures, similar to invasive cervical vagus nerve (CVN) stimulation. Presumably, both methods stimulated myelinated afferent beta axons mediating anti-convulsive effects. How numbers of A beta axons in the human ABVN compare to those of the CVN is unknown. The ABVN, CVN, rec...

Classical and ultrastructural neuropathology of prion diseases are generally well described. Here we report that alterations of myelinated fibres in hamsters infected either with polioencephalopathic strains of scrapie or panencephalopathic strains of CJD (Echigo-1) are virtually identical and differ only quantitatively. In contrast, mice infected with the panencephalopathic Fujisaki strain of ...