A Histochemical Study of the Connective-Tissue Sheath of the Nervous System of Periplaneta americana

1961 ◽  
Vol s3-102 (60) ◽  
pp. 455-461
Author(s):  
DOREEN E. ASHHURST
Keyword(s):  
Nervous System ◽  
Connective Tissue ◽  
Periplaneta Americana ◽  
Collagen Type ◽  
Histochemical Study ◽  
Type Protein ◽  
Connective Tissue Sheath ◽  
Sheath Cells

The connective-tissue sheath surrounding the nervous system of Periplaneta americana consists of two layers, the neural lamella and the sheath cells beneath it. The neural lamella is composed of a collagen-type protein and neutral muco-polysaccharide. The sheath cells possess numerous lipochondria and mitochondria; the former consist of phospholipid and some cerebroside. The cytoplasm of the sheath cells contains some RNA, glycogen, and lipid.

The Connective Tissue Sheath of the Locust Nervous System: A Histochemical Study

1959 ◽  
Vol s3-100 (51) ◽  
pp. 401-412
Author(s):  
DOREEN E. ASHHURST
Keyword(s):  
Nervous System ◽  
Connective Tissue ◽  
Collagen Type ◽  
Histochemical Study ◽  
Locusta Migratoria ◽  
System A ◽  
Large Numbers ◽  
Connective Tissue Sheath ◽  
Cellular Layer ◽  
Sheath Cells

The connective tissue sheath surrounding the nervous system of Locusta migratoria has been studied histochemically. It consists of an outer non-cellular layer, the neural lamella, and an inner layer of cells, the sheath-cells. The neural lamella has been identified as being composed of a collagen-type protein and neutral mucopolysaccharide on the evidence of its histochemical reactions and the identification of hydroxyproline by paper chromatography in a hydrolysate of the neural lamella. The sheath-cells possess large numbers of lipochondria composed of phospholipids and cerebrosides, and small spherical mitochondria. The cytoplasm also contains lipids (some of which may be cerebrosides), glycogen, and RNA.

The Connective-Tissue Sheath of the Nervous System of Locusta migratoria: an Electron Microscope Study

1961 ◽  
Vol s3-102 (60) ◽  
pp. 463-467
Author(s):  
DOREEN E. ASHHURST ◽  
J. A. CHAPMAN
Keyword(s):  
Endoplasmic Reticulum ◽  
Nervous System ◽  
Electron Microscope ◽  
Connective Tissue ◽  
Electron Microscope Study ◽  
Locusta Migratoria ◽  
Inner Surface ◽  
Connective Tissue Sheath ◽  
Cellular Layer ◽  
Sheath Cells

The sheath is composed of an outer non-cellular layer, the neural lamella, and an inner layer of sheath cells. The neural lamella possesses a large number of collagen fibrils arranged in layers with differing orientations. The sheath cells are flattened on the inner surface of the lamella and the cytoplasm contains lipochondria, mitochondria, and small amounts of endoplasmic reticulum.

scholarly journals The connective tissue sheath of the locust nervous system: its development in the embryo

1965 ◽  
Vol s3-106 (73) ◽  
pp. 61-73
Author(s):  
DOREEN E. ASHHURST
Keyword(s):  
Endoplasmic Reticulum ◽  
Nervous System ◽  
Connective Tissue ◽  
Lipid Droplets ◽  
Schistocerca Gregaria ◽  
Ganglion Cells ◽  
Embryological Development ◽  
Electron Dense Material ◽  
Connective Tissue Sheath ◽  
Sheath Cells

The embryological development of the connective tissue sheath around the nervous system has been investigated in Schistocerca gregaria. The sheath cells appear to be derived from outlying ganglion cells. The neural lamella is first visible when the embryo is 9 days old and it increases in thickness until hatching occurs on the twelfth day. It is produced entirely by the sheath cells. The sheath cells have numerous lipid droplets in their cytoplasm. Some neutral mucopolysaccharide and proteins are also present. The histochemical reactions of the neural lamella after its formation suggest that it is composed of collagenous proteins embedded in neutral mucopolysaccharides. The sheath cells are typical fibroblasts during the formation of the neural lamella. The cisternae of the endoplasmic reticulum are dilated into vesicles which contain a somewhat electron-dense material. No intracellular fibrils were observed. Collagen fibrils with banding of periodicity between 55 and 60 mµ. are seen in the neural lamella from 11 days onwards.

scholarly journals The Ultrastructure of the Perineurium in two Insect Species, Carausius Morosus and Periplaneta Americana

1967 ◽  
Vol 2 (1) ◽  
pp. 119-128
Author(s):  
S. H. P. MADDRELL ◽  
J. E. TREHERNE
Keyword(s):  
Connective Tissue ◽  
Periplaneta Americana ◽  
Fluid Transport ◽  
Insect Species ◽  
Carausius Morosus ◽  
Insect Central Nervous System ◽  
Connective Tissue Sheath ◽  
Extracellular Sodium ◽  
Perineurial Cells ◽  
Cellular Layer

The organization of the perineurium in two insect species (Carausius morosus and Periplaneta americana) has been examined with the electron microscope. In both species this cellular layer has been found to possess an extensive system of tortuous channels between the lateral cell walls. These channels are open at the outer margin adjacent to the fibrous connective-tissue sheath, but appear to be closed at the inner margin by regions of septate desmosomes and/or ‘tight’ junctions. There is an increased surface area at the inner margin of the perineurial cells produced by the presence of long inwardly directed flanges. An electron-dense coat has also been identified on the cytoplasmic side of the type II perineurial cell membranes at points of contact with the underlying extracellular system and at the outer surface adjacent to the connective-tissue sheath. This organization of the perineurium is strikingly similar to that observed in a variety of fluid-secreting epithelia and its possible function in fluid transport is discussed in relation to the available evidence on the physiology of the insect central nervous system. It is suggested, contrary to some earlier suppositions, that the perineurium may not be primarily involved in the control of the extracellular sodium level and that this regulation may be effected at a deeper level in the central nervous tissues.

scholarly journals The Fine Structure of Nerve Cells and Fibers, Neuroglia, and Sheaths of the Ganglion Chain in the Cockroach (Periplaneta americana)

1958 ◽  
Vol 4 (6) ◽  
pp. 731-742 ◽  
Author(s):  
Arthur Hess
Keyword(s):  
Fine Structure ◽  
Connective Tissue ◽  
Periplaneta Americana ◽  
Nerve Fibers ◽  
Nerve Cells ◽  
Cresyl Violet ◽  
Dark Cells ◽  
Electron Microscopes ◽  
Pass Through ◽  
Connective Tissue Sheath

The abdominal nerve cord of Periplaneta americana was studied utilizing light and electron microscopes. In the nerve cells, delicate granules, similar to those probably responsible for cytoplasmic basophilia, are evenly distributed in "dark" cells and clumped in "light" cells. Neuroglial cells are stained metachromatically by cresyl violet. The neuroglial cells have many processes which ramify extensively and are enmeshed to form overlapping layers. These imbricated processes ensheath the nerve cells; the inner layer of the sheath penetrates into the neuron and is responsible for the appearance of the trophospongium of Holmgren. Nerve fibers are embedded within glial cells and surrounded by extensions of the plasma membrane similar to mesaxons. Depending on their size, two or several nerve fibers may share a single glial cell. Nerve fibers near their terminations on other nerve fibers contain particles and numerous, large mitochondria. The ganglion is ensheathed by a thick feltwork of connective tissue and perilemmal cells. The abdominal connective has a thinner connective tissue sheath which is without perilemmal cells. The nerve fibers and sheaths in the connective become thinner as they pass through ganglia.

scholarly journals The cloning of a receptor-type protein tyrosine phosphatase expressed in the central nervous system

1993 ◽  
Vol 268 (14) ◽  
pp. 10573-10581
Author(s):  
J.B. Levy ◽  
P.D. Canoll ◽  
O. Silvennoinen ◽  
G. Barnea ◽  
B. Morse ◽  
...  
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Protein Tyrosine Phosphatase ◽  
Tyrosine Phosphatase ◽  
Receptor Type ◽  
Protein Tyrosine ◽  
Type Protein ◽  
The Central Nervous System
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