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Author:
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ISBN:
Category : Anatomy
Languages : de
Pages : 540
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Book Description
Includes also the "2. ergänzte und erweiterte Aufl." of v. 34, published 1952.
Author:
Publisher:
ISBN:
Category : Anatomy
Languages : de
Pages : 540
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Book Description
Includes also the "2. ergänzte und erweiterte Aufl." of v. 34, published 1952.
Author: National Library of Medicine (U.S.)
Publisher:
ISBN:
Category : Medicine
Languages : en
Pages : 1242
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Book Description
First multi-year cumulation covers six years: 1965-70.
Author: National Library of Medicine (U.S.)
Publisher:
ISBN:
Category : Medicine
Languages : en
Pages : 1516
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Book Description
A keyword listing of serial titles currently received by the National Library of Medicine.
Author: G.D. Das
Publisher: Springer Science & Business Media
ISBN: 3642866549
Category : Science
Languages : en
Pages : 60
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Book Description
The presence of nerve cells in the white matter of the spinal cord and in the spinal and cranial nerves has attracted the attention of some researchers in the past. Because of their location in such unexpected regions, these neurons provided a rich field of speculation regarding their nature and function. This was partic ularly true about the nerve cells lying in the spinal white matter. From phylogenetic considerations, neurons in the spinal white matter are present more abundantly in amphibians, reptiles and brids than in mammals. A. brief survey of literature on lower vertebrates indicates that GASKELL (1885, 1889) was the first to describe the displaced neurons in the white matter of the spinal cord of alligators and various species of birds. In his consideration they were displaced ganglion cells. In 1902 von KOELLIKER gave an exhaustive account of such neurons in the white matter of the spinal cord of reptiles and birds. In these animals he observed clusters of such neurons running in longitudinal columns and thus was able to group them into nuclei known as "Hofmann's nuclei". Further, he suggested that these nuclei arise from the mass of the ventral horn and that they may give rise t. o preganglionic fibers, motor fibers or ventral commissural fibers. In t. he ensuing years investigation of these nuclei was extended by STREE TER, KRAUSE, TERNI, HUBER and others (quoted from ARIENS KAPPERS et. aI. , 1960, Vol. I, p. 206-210).
Author: E. Ramon-Moliner
Publisher: Springer Science & Business Media
ISBN: 3642500552
Category : Medical
Languages : en
Pages : 53
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Book Description
The earliest studies on the regional distribution of acetylcholinesterase (AChE) within the central nervous system were based on the determination of the amount of CO liberated by homogenates of selected areas in the presence of an ester of 2 choline and a bicarbonate buffer. Using this biochemical approach, Burgen and Chipman (1951) were able to establish that acetylcholinesterase is not evenly distributed within the central nervous system. They found that the cerebellum, the lateral geniculate body, and the striatum contained a high concentration of AChE. The high concentration of AChE in the striatum could be correlated with a higher rate of acetylcholine synthesis. However, this was not the case for the cerebellum, where acetylcholine synthesis was very low. Other in vitro studies have been aimed at establishing the regional distribution of the other two components of the cholinergic system, cholinacetylase (ChA) and acetylcholine (ACh). An equally asymetrical distribution for these substances has been established in vitro (MacIntosh, 1941 ; Feldberg and Mann, 1946; Feldberg and V ogt, 1948; MacIntosh and Oborin, 1953; Quastel, 1962; Mitchell, 1963; Krnjevic and Phillis, 1963; Aprison et al., 1964; McLennan, 1964; Cohen, 1956). The in vitro determination of acetylcholinesterase (Koelle, 1950; Burgen and Chipman, 1951; Giacobini, 1959; Bennett et al., 1966; Fahn and Cote, 1968; Miller et al., 1969) presents the advan tage of permitting the use of a substrate like ACh which is a normally occurring ester of choline so that the establishment of enzyme specificity is less questionable.
Author: Henrik Henriksön Lindeman
Publisher: Springer
ISBN: 3662249928
Category : Medical
Languages : en
Pages : 114
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Book Description
The membranous labyrinth lies enclosed in the very hard petrous part of the temporal bone and, as the name implies, its structure is extremely complex. This may explain why our knowledge of this organ and the vestibular sensory regions within it, is not yet satisfactory. In recent years the rapid development of space research has provided a power ful stimulus to our interest in the vestibular apparatus. This has found expression in annual symposia, in which the role of the vestibular organs in the exploration of space is discussed. However, little is known as yet about the influence upon the equilibrial apparatus, during space flight, of weightlessness and other related conditions. The inner ear has also acquired increased significance from an otosurgical point of view. Operations are today performed in regions previously inaccessible to surgery. This requires exact knowledge of anatomical details and of relations between the different structures in the inner ear.
Author: Radomir Cihak
Publisher: Springer Science & Business Media
ISBN: 3662090813
Category : Medical
Languages : en
Pages : 194
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Book Description
The aim of the present publication is to summarize the results of studies of ontogenesis of the skeleton and muscles of the human hand and foot. Our primary interest in studying the muscles arose from observations of variations, in which a new form of the anomalous muscle in the popliteal fossa had been described (Cihak, 1954; Hnevkovsky and Cihak, 1957) and in which changes of muscle forms in the congenitally malformed extremity had also been studied (Brlickova and Cihak, 1956). The desire to clarify muscle variations by means of the onto genesis led to a study of ontogenesis of single muscles. During observation of the embryonic pectoralis major special muscle bundles were primarily observed, which could be homologised with the sphincter colli muscle of lower Mammals. Further observation revealed that this muscle (concordantly with its phylo genetic development) gradually develops in the course of human ontogenesis from a small primordium to its maximal extent and becomes reduced thereafter and finally disappears, still during the embryonic period (Cihak, 1957). This study was decisive for the further development of our theme, since it demonstra tes, how consistently in the development of the locomotor apparatus the rule of recapitulation is asserted and how this can be employed in developmental studies of muscles.
Author: H. Aldskogius
Publisher: Springer Science & Business Media
ISBN: 3642658679
Category : Medical
Languages : en
Pages : 78
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Book Description
In the previous study (Part I) a description was given of the ultrastructural changes occurring during indirect Wallerian degeneration in the intramedullary root fibre region of the kitten hypoglossal nerve. One of the striking features of this degeneration process was the appearance at an early stage of micro glial cells completely covered by myelin, which apparently participated in phago cytosis of degenerating axoplasm and to a small extent of their own myelin covering. Evidence was obtained indicating that the numerous degenerating glial cells seen somewhat later in the degeneration process were derived from these myelin-covered microglial cells. Since glial cells of the type described in the previous study have never been implicated in the process of direct Wallerian degeneration, the possibility exists that they may in fact be characteristic for indirect Wallerian degeneration. However, this possibility cannot be adequately assessed unless our present rather scanty knowledge concerning the early glial reaction during direct Wallerian degeneration is extended. Therefore the present study has been undertaken to examine the ultrastructural changes during direct W allerian degeneration in the kitten, with particular reference to the possible occurrence of myelin-covered microglial cells and degenerating glial cells of the type described in the previous study (see Part I). Since no systematic ultra structural study on direct Wallerian degeneration in immature animals seem to exist, observations on changes in the myelinated nerve fibres and the different types of glial cells have been included.
Author: Z. Halata
Publisher: Springer Science & Business Media
ISBN: 3642454658
Category : Medical
Languages : en
Pages : 77
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Book Description
Whilst most of the senses (hearing, sight, smell and taste) have their own organs, the tactile sense is dependent on the sensory nerve endings of the periph eral processes of the nerve cells in the spinal ganglia. These nerve endings are distributed over the entire body. They vary in number and structure according to the nature of the tissue. For instance, the quantitative innervation of the mucosa differs from the innervation of the periosteum or the articular capsules. The skin and its related tissues are relatively richly innervated, but here too there are regional differences. Some areas, such as the skin of the back, have relatively few nerve endings, whilst other parts (e.g. the skin of the fingers) are richly innervated. Most authors describe the nerve endings systematically from the surface of the epidermis to the lower layers of the dermis. On the basis of the topographical criteria, we differentiate between epidermal and dermal nerve endings.
Author:
Publisher:
ISBN:
Category : Anatomy
Languages : en
Pages : 518
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Book Description
Volumes 1-5 include Proceedings of the Association of American anatomists (later American Association of Anatomists), 15th-20th session (Dec. 1901/Jan. 1902-Dec. 1905).
