Antidromic vasodilation in frog: identification of the nerve fiber types involved

1991 ◽  
Vol 419 (5) ◽  
pp. 508-513 ◽  
Author(s):  
V. M. Khayutin ◽  
Raisa S. Sonina ◽  
G. I. Frolenkov ◽  
I. M. Zizin
Keyword(s):  
Nerve Fiber ◽  
Fiber Types ◽  
Antidromic Vasodilation

Measurements and mapping of 282,420 nerve fibers in the S1–5 nerve roots

2009 ◽  
Vol 11 (3) ◽  
pp. 255-263 ◽  
Author(s):  
Erik F. Hauck ◽  
Markus Schwefer ◽  
Werner Wittkowski ◽  
Hans W. Bothe
Keyword(s):  
Nerve Fiber ◽  
Cross Sections ◽  
Fiber Diameter ◽  
Inverse Correlation ◽  
Nerve Fibers ◽  
Fiber Types ◽  
Nerve Roots ◽  
Sacral Nerve ◽  
Dorsal Roots ◽  
Fiber Stimulation

Object The study aims to analyze nerve fiber types in the sacral nerve roots as a prerequisite for stimulation. Methods One-micrometer cross-sections of human ventral and dorsal S1–5 roots were stained with osmium and toluidine blue. The total fiber diameter and myelin sheath were measured in 282,420 nerve fibers. Results The analysis revealed the following 3 main nerve fiber types: Aα fibers (diameter 6–14 μm), Aγ fibers (diameter 2–4 μm), and B fibers (diameter < 2 μm). The B fibers were absent in S-1, present in some S-2 fascicles, and abundant from S-3 to S-5. The Aα fibers dominated the S-1 roots and most fascicles of S-2 roots. In the S3–5 roots, only a few Aα fibers were present. The relative occurrence of Aγ fibers increased from S-1 to S-5. In dorsal roots, Aγ fibers represented ~ 70% of all nerve fibers in every root and fascicle. Conclusions The B fibers represented efferent parasympathetic fibers. These fibers were concentrated in certain areas of the nerve roots, not randomly distributed. The Aα fibers innervate lower-extremity muscles and sphincters. The inverse correlation of Aα and Aγ fibers in the ventral roots from S-1 to S-5 is surprising. In dorsal roots, Aγ fibers may conduct pain, touch, and temperature signals. Highly selective fiber stimulation specific for type, location, and direction may improve sacral nerve stimulation for a spastic bladder in paraplegic individuals.

Nerve Fiber Types

2015 ◽  
pp. 107-113 ◽  
Author(s):  
Ivan Varga ◽  
Boris Mravec
Keyword(s):  
Nerve Fiber ◽  
Fiber Types

Identification of different EEC types and nerve fiber types in human gastric mucosa v1 (protocols.io.8u7hwzn)

protocols.io ◽  
2019 ◽  
Author(s):  
Madeleine Di ◽  
Josiane Fakhry ◽  
Martin Stebbing ◽  
Billie Hunne ◽  
John B
Keyword(s):  
Gastric Mucosa ◽  
Nerve Fiber ◽  
Human Gastric Mucosa ◽  
Fiber Types

Determinants of nerve conduction recovery after nerve injuries: Compression duration and nerve fiber types

2015 ◽  
Vol 52 (1) ◽  
pp. 107-112 ◽  
Author(s):  
To-Jung Tseng ◽  
Tin-Hsin Hsiao ◽  
Sung-Tsang Hsieh ◽  
Yu-Lin Hsieh
Keyword(s):  
Nerve Fiber ◽  
Nerve Conduction ◽  
Fiber Types ◽  
Nerve Injuries

Structural Organization and Distribution of Fiber Types in Extraocular Muscles of Cats

1972 ◽  
Vol 30 ◽  
pp. 34-35
Author(s):  
Asish C. Nag ◽  
Lee D. Peachey
Keyword(s):  
Fiber Type ◽  
Light And Electron Microscopy ◽  
Small Diameter ◽  
Extraocular Muscles ◽  
Fiber Types ◽  
Distinctive Features ◽  
Superior Rectus ◽  
Adult Cats ◽  
Different Diameters ◽  
Orbital Region

Cat extraocular muscles consist of two regions: orbital, and global. The orbital region contains predominantly small diameter fibers, while the global region contains a variety of fibers of different diameters. The differences in ultrastructural features among these muscle fibers indicate that the extraocular muscles of cats contain at least five structurally distinguishable types of fibers.Superior rectus muscles were studied by light and electron microscopy, mapping the distribution of each fiber type with its distinctive features. A mixture of 4% paraformaldehyde and 4% glutaraldehyde was perfused through the carotid arteries of anesthetized adult cats and applied locally to exposed superior rectus muscles during the perfusion.

Use of EDS mapping to characterize thermochemical stability of fibers in intermetallic matrix composites

1992 ◽  
Vol 50 (1) ◽  
pp. 160-161
Author(s):  
John R. Porter
Keyword(s):  
Spatial Information ◽  
Beam Current ◽  
Fiber Types ◽  
Ceramic Fibers ◽  
Dye Transfer ◽  
Science Center ◽  
Commercial Development ◽  
Nih Image ◽  
Intermetallic Matrix Composites ◽  
Thermochemical Stability

New ceramic fibers, currently in various stages of commercial development, have been consolidated in intermetallic matrices such as γ-TiAl and FeAl. Fiber types include SiC, TiB2 and polycrystalline and single crystal Al2O3. This work required the development of techniques to characterize the thermochemical stability of these fibers in different matrices.SEM/EDS elemental mapping was used for this work. To obtain qualitative compositional/spatial information, the best realistically achievable counting statistics were required. We established that 128 × 128 maps, acquired with a 20 KeV accelerating voltage, 3 sec. live time per pixel (total mapping time, 18 h) and with beam current adjusted to give 30% dead time, provided adequate image quality at a magnification of 800X. The maps were acquired, with backgrounds subtracted, using a Noran TN 5500 EDS system. The images and maps were transferred to a Macintosh and converted into TIFF files using either TIFF Maker, or TNtolMAGE, a Microsoft QuickBASIC program developed at the Science Center. From TIFF files, images and maps were opened in either NIH Image or Adobe Photoshop for processing and analysis and printed from Microsoft Powerpoint on a Kodak XL7700 dye transfer image printer.

Mast cell-nerve fiber interaction: Ultrastructural studies

1990 ◽  
Vol 48 (3) ◽  
pp. 428-429
Author(s):  
E.Y. Chi ◽  
M.L. Su ◽  
Y.T. Tien ◽  
W.R. Henderson
Keyword(s):  
Mast Cell ◽  
Mast Cells ◽  
Substance P ◽  
Nerve Fiber ◽  
Sensory Nerves ◽  
Ultrastructural Studies ◽  
Morphological Studies ◽  
Granulocyte Infiltration ◽  
Intracutaneous Injection ◽  
Recent Attention

Recent attention has been directed to the interaction of the nerve and immune systems. The neuropeptide substance P, a tachykinnin which is a neurotransmitter in the central and peripheral nervous systems produces tissue swelling, augemntation of intersitial fibrin deposition and leukocyte infiltration after intracutaneous injection. There is a direct correlation reported between the extent of mast cell degranulation at the sites of injection and the tissue swelling or granulocyte infiltration. It has previously been demonstrated that antidromic electrical stimulation of sensory nerves induces degranulation of cutaneous mast cells, cutaneous vasodilation and augmented vascular permeability. Morphological studies have documented a close anatiomical association between mast cells and nonmyelinated nerves, that contain substance P and other neuropeptides. However, the presence of mast cells within nerve fasicles has not been previously examined ultrastructurally. In this study, we examined ultrastructurally the distribution of mast cells in the nerve fiber bundles located in the muscular connective tissue of rat tongues (n=20).

Deep proteomic characterization of fiber types of murine muscles by laser microdissection and mass spectrometry

2019 ◽  
Author(s):  
B Eggers ◽  
K Schork ◽  
R Schröder ◽  
CS Clemen ◽  
C Berwanger ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Laser Microdissection ◽  
Fiber Types
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