geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Axon diameters in relation to the spike dimensions and the conduction velocity in mammalian A fibers


, : Axon diameters in relation to the spike dimensions and the conduction velocity in mammalian A fibers. Amer Jour Physiol 127(2): 393-414

From charts showing the distribution of fibers according to size in the saphenous nerve of the cat and the rabbit, reconstructions of the form of the conducted action potentials were made. Good fits were obtained with the recorded action potentials from the same nerves, and the medullated fibers of all sizes were accounted for. From these reconstructions empirical size-velocity curves were prepared. The following evidence was obtained that the medullated fibers of these nerves constitute a homogeneous system and therefore were suitable for study of the variations dependent upon size. a. The spikes all had the same duration within the limits, 0.4 to 0.5 msec. b. The fibers all had the same after-potential system. Success in the reconstructions depended upon the detn. of the fact that the spike size varied as the axon radius, and not as the square of the radius, as previously held. Measurements were made of the axon diams. and the outside diams. of the 675 fibers in a fasciculus of the saphenous nerve, and the ratios of the 2 diams. were plotted against the outside diams. For fibers larger than 8 u the mean ratio was found to be approximately constant. Below 8 u it decreased progressively. With the aid of these data axon-diarn. velocity curves were calculated from the outside-diam. velocity curves. The velocity of conduction was found to be approximately proportional to the axon diam., but a slight curvature in the graph connecting the 2 variables indicated that the velocity changed somewhat less rapidly than it would if the relationship were strictly linear.

US$29.90


Other references

Anderson, J.S.; Nettleton, J.A.; Herrington, D.M.; Johnson, W.Craig.; Tsai, M.Y.; Siscovick, D., 2010: Relation of omega-3 fatty acid and dietary fish intake with brachial artery flow-mediated vasodilation in the Multi-Ethnic Study of Atherosclerosis. The relation between dietary fish intake and brachial artery measures, including brachial artery flow-mediated dilation (FMD), has not been well established across sex and racial-ethnic groups. We hypothesized that consumption of nonfried fish and...

Li, Q.; Ye, L.; Guo, W.; Wang, M.; Huang, S.; Peng, X., 2017: PHF21B overexpression promotes cancer stem cell-like traits in prostate cancer cells by activating the Wnt/β-catenin signaling pathway. PHF21B is newly identified to be involved in the tumor progression; however, its biological role and molecular mechanism in prostate cancer have not been defined. This study is aimed to study the role of PHF21B in the progression of prostate cance...

Pilleri, G., 1967: On physiopathology of the temporal lobe. Following a synopsis of the different temporal lobe structures and their projections, the most important functions of the temporal lobe and the closely related limbic system were discussed. Finally the Klllver-Bucy syndrome [a case of a 60 year ol...

Kumarasamy, E.; Raghunathan, R.; Sibi, M.P.; Sivaguru, J., 2016: Nonbiaryl and Heterobiaryl Atropisomers: Molecular Templates with Promise for Atropselective Chemical Transformations. Chemical Reviews 115(20): 11239-11300

Hougaard, M.; Hansen, H.Steen.; Thayssen, P.; Antonsen, L.; Jensen, L.Okkels., 2017: Uncovered Culprit Plaque Ruptures in Patients With ST-Segment Elevation Myocardial Infarction Assessed by Optical Coherence Tomography and Intravascular Ultrasound With iMap. This study assessed the incidence and course of healing of uncovered plaque ruptures (PR) following primary percutaneous coronary intervention. The infarct-related occlusion is frequently located at the lesion site with maximum thrombus burden, wh...

Young, T.; Scavello, G.; Paluru, P.; Ganther, W., 2003: Exclusion of TGF beta-induced factor as a candidate gene for MYP2 autosomal dominant high myopia. American Journal of Human Genetics 73(5): 542, November

Lee, S.C.; Wang, X.; Strong, D.D.; Linkhart, T.A., 2000: Fibroblast growth factor-2 regulation of insulin-like growth factor binding protein-5 gene transcription. Journal of Bone & Mineral Research 15(Suppl 1): S258, September

Alberi, S., 1999: Study of the glutamatergic-induced suppression of the slow after-hyperpolarisation in hippocampal CA1 pyramidal neurons of the rat. Society for Neuroscience Abstracts 25(1-2): 1233

Liebler E.M.; Gerhards H.; Denkhaus M.; Pohlenz J., 1989: Micronema deletrix infection as the cause of granulomatous nephritis in a horse. Infections with Micronema deletrix are described sporadically in humans and horses. This case report describes the infection with Mikronema deletrix in a horse. The animal was sent to the clinic because of recurrent colic. On rectal palpation a ma...

McInnes, E., 2011: Cochrane reviews--in their own words. Support surfaces to prevent pressure ulcers. Journal of Evidence-Based Medicine 3(2): 132-132