Abstract
The functional and structural unit of the nervous system is the nerve cell, the neuron. The neuron resembles all other cells in that it has a nucleus surrounded by cytoplasm. It differs from other cells in the tremendous volume of cytoplasm in relation to its nuclear size, and particularly in the fact that the cytoplasm is drawn out into long cylindrical threads which extend for great distances to contact an end organ, for example muscle, or another neuron. In long neurons these extended processes, called axons, may be a meter or more in length depending on the size of the animal; and, yet, the diameter is measured in a few microns. Moreover, the axons branch repeatedly especially as they approach their terminus. The region of the neuron containing the nucleus is called the cell body, which is often irregularly spherical in shape. From the cell body arises the axon which is found in all neurons. Some types of neurons have other cytoplasmic processes, called dendrons, which also arise from the cell body. Dendrons are much shorter and very branched; they end within the vicinity of the cell body and serve to enlarge the surface of the cell body to receive contacts from axons of other neurons. Such contacts made on the cell body and dendrons are called synapses.
The author’s research is supported by grants from the American Cancer Society and the National Institutes of Health.
Guggenheim Foundation Fellow during 1967, in the Instituto Anatomia, Università Cattolica, Rome, Italy.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Butler, E. D. and O. E. Schotte. Histological alterations in denervated non-regenerating limbs of urodele larvae. J. Exp. Zool., 88:307–341, 1941.
Korr, Wilkinson and Chornock. Axonal delivery of neuroplasmic components to muscle cells. Science, 155:342–344, 1967.
Kudokotsev, V. P. Stimulation of the regenerative process in the extremities of lizards by the method of supplementing innervation. Dokl. Akad. Nauk. SSSR, 142:233–236, 1962.
Peadon, A. M. and M. Singer. A quantitative study of forelimb innervation in relation to regenerative capacity in the larval, land stage and adult forms of Triturus viridescens. J. Exp. Zool, 159:337–346, 1965.
Rose, S. M. Methods of initiating limb regereration in adult Anura. J. Exp. Zool, 95:149–170, 1944.
Rzehak, K. and M. Singer. The number of fibers in the limb of the mouse and its relation to regenerative capacity. Anat. Rec., 155:537–540, 1966.
Rzehak, K. and M. Singer. Limb regeneration and nerve fiber number in Rana sylvatica and Xenopus laevis. J. Exp. Zool, 162:15–21, 1966a.
Simpson, S. B. Induction of limb regeneration in the lizard, Lygosoma laterale, by augmentation of the nerve supply. Proc. Soc. Exp. Biol. Med., 107:108–111, 1961.
Singer, M. The nervous system and regeneration of the forelimb of adult Triturus. V. The influence of number of nerve fibers, including a quantitative study of limb innervation. J. Exp. Zool, 101:299–337, 1946.
Singer, M. The nervous system and regeneration of the forelimb of adult Triturus. VI. The relation between number of nerve fibers and surface area of amputation. J. Exp. Zool., 104:251–265, 1947.
Singer, M. The influence of the nerve in regeneration of the amphibian extremity. Quart. Rev. Biol., 27:169–200, 1952.
Singer, M. Induction of regeneration of the forelimb of the frog by augmentation of the nerve supply. J. Exp. Zool., 126:419–472, 1954.
Singer, M. The influence of nerves on regeneration. In: Regeneration in Vertebrates (C. S. Thornton, ed.). University of Chicago Press, Chicago, 1959.
Singer, M. Induction of regeneration of body parts in the lizard, Anolis. Proc. Soc. Exp. Biol. Med., 107:106–108, 1961.
Singer, M. The trophic quality of the neuron: some theoretical considerations. In: Progress in Brain Research, vol. 13. Mechanisms of Neuronal Regeneration (M. Singer and J. P. Schadé, eds.), 228–232, Elsevier, Amsterdam, 1964.
Singer, M., R. P. Kamrin and A. Ashbaugh. The influence of denervation upon trauma-induced regenerates of the forelimb of the postmetamorphic frog. J. Exp. Zool., 136:35–52, 1957.
Singer, M., K. Rzehak and C. Maier. The relation between the caliber of the axon and the trophic activity of nerves in limb regeneration, J. Exp. Zool., 1967 (in press).
Skowron, S. and F. Komala. Limb regeneration in postmetamorphic Xenopus laevis. Folia Biol. (Krakow), 5:53–72, 1957.
Spallanzani, A. An Essay on Animal Reproductions (Translated from the Italian, M. Maty, London, 1769), 1768.
Thornton, C. S. Histological modifications in denervated injured forelimbs of Amblystoma larvae. J. Exp. Zool, 122:119–150, 1953.
van Stone, J. M. The relation between innervation and regenerative capacity in hind limbs of Rana sylvatica. J. Exp. Zool., 155:293–302, 1955.
Author information
Authors and Affiliations
Editor information
Rights and permissions
Copyright information
© 1968 Springer-Verlag New York Inc.
About this paper
Cite this paper
Singer, M. (1968). Some Quantitative Aspects Concerning the Trophic Role of the Nerve Cell. In: Mesarović, M.D. (eds) Systems Theory and Biology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-88343-9_11
Download citation
DOI: https://doi.org/10.1007/978-3-642-88343-9_11
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-88345-3
Online ISBN: 978-3-642-88343-9
eBook Packages: Springer Book Archive