Caspr reveals an aggregation of nodes and flanking node free zones at the rat trigeminal sensory root and dorsal root entry zones

Glia ◽  
2004 ◽  
Vol 49 (3) ◽  
pp. 445-450 ◽  
Author(s):  
Michael A. Henry ◽  
Rachael S. Rzasa ◽  
Joshua J. Beeler ◽  
S. Rock Levinson
Keyword(s):  
Dorsal Root ◽  
Sensory Root

Memoirs: The Lateral Sensory Canals, the Eye-Muscles, and the Peripheral Distribution of certain of the Cranial Nerves of Mustelus lævis

1901 ◽  
Vol s2-45 (178) ◽  
pp. 87-236
Author(s):  
EDWARD PHELPS ALLIS
Keyword(s):  
Dorsal Root ◽  
Cranial Nerves ◽  
Sensory Nerve ◽  
Ventral Root ◽  
Eye Muscles ◽  
Terminal Buds ◽  
Sensory Root ◽  
Frontal Branch ◽  
Three Components

There are, in fishes, several ophthalmic nerves between which it is necessary to carefully distinguish. While their exact inter-homologies cannot as yet be definitely affirmed, certain very probable homologies can certainly be arrived at. The portio ophthalmici profundi of bony ganoids, and the ramus ophthalmicus profundus and ramus ophthalmicus superficialis trigemini of elasmobranchs, are general sensory cutaneous nerves, and probably contain all of those general sensory elements that belong to the ophthalmic nerves of vertebrates. The portio ophthalmici profundi of ganoids is the homologue either of the ramus ophthalmicus superficialis trigemini of elasmobranch Sj or of a frontal branch of the ramus profundus that has, in certain selachians (Læmargus), the position of a superficial ophthalmic nerve; or it is the homologue of both those nerves of elasmobranchs. In the higher animals this portio profundi becomes the frontal branch of the ophthalmic nerve. The ramus ophthalmicus profundus of elasmobranchs and of Polypterus, and that nerve alone, is the homologue of the ramus nasalis or naso-ciliaris of higher animals. This nerve and the portio ophthalmici profundi vary inversely in importance. The ramus ophthalmicus superficialis trigemini of Ainia is a communis nerve, and is probably the homologue of that part of the ophthalmicus superficialis facialis of Acipenser and elasmobranchs that is derived from the so-called dorsal root of Trigeminus II. This latter root arises from the lobus trigemini of the latter fishes, is considered by certain authors as a lateral sensory root, and is called by them the dorsal root of the ramus opthalmicus superficialis facialis. The ramus ophthalmicus superficialis facialis of Ami a is a lateral sensory nerve, and has its probable homologue in that part only of the ophthalmicus superficialis facialis of Acipenser and elasmobranchs that is derived from the so-called ventral root of Trigeminus II. This root arises, in all fishes, from the tuberculum acusticum. The so-called ramus ophthalmicus superficialis trigemini of teleosts is the ramus ophthalmicus superficialis trigemini of Amia plus the portio ophthalmici profundi of that fish, these two components being found in varying proportions. The ramns ophthalmicus superficialis of selachians probably always contains the same three components, or portiones, that are found in the superficial ophthalmic nerve of Amia, but the portio ophthalmici profundi, called in selachians the portio trigemini, is usually small and may be reduced to a few fibres only (Rays, Ewart). The portio trigemini of Amia is represented in selachians, as stated above, by those fibres of the so-called portio facialis that arise from the lobus trigemini; that is, by the fibres that form the so-called dorsal root of Trigeminus II. The terminal buds of ganoids and teleosts, the nerve-sacs of Acipenser, and the ampullae of selachians, are in all probability homologous structures.

Membrane-associated microtubular areays induced in proximal myelinated processes of dorsal root ganglia by large doses of vitamin B6

1986 ◽  
Vol 44 ◽  
pp. 368-369
Author(s):  
V.J. Montpetit ◽  
S. Dancea ◽  
L. Tryphonas ◽  
D.F. Clapin
Keyword(s):  
Animal Model ◽  
Endoplasmic Reticulum ◽  
Dorsal Root Ganglia ◽  
Rough Endoplasmic Reticulum ◽  
Dorsal Root ◽  
Vitamin B6 ◽  
Morphological Changes ◽  
Model System ◽  
Sensory Nerves ◽  
Peripheral Sensory

Very large doses of pyridoxine (vitamin B6) are neurotoxic in humans, selectively affecting the peripheral sensory nerves. We have undertaken a study of the morphological and biochemical aspects of pyridoxine neurotoxicity in an animal model system. Early morphological changes in dorsal root ganglia (DRG) associated with pyridoxine megadoses include proliferation of neurofilaments, ribosomes, rough endoplasmic reticulum, and Golgi complexes. We present in this report evidence of the formation of unique aggregates of microtubules and membranes in the proximal processes of DRG which are induced by high levels of pyridoxine.

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