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  • 1
    Electronic Resource
    Electronic Resource
    Cerebellar projections to the nuclei ventralis lateralis and ventralis anterior thalami (1974)
    Springer
    Anatomy and embryology 146 (1974), S. 95-111 
    Details
    ISSN: 1432-0568
    Keywords: Cerebellum ; Thalamus ; Electron microscopy ; Autoradiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary An experimental electron microscopical study has been made on the mode of termination of the cerebellothalamic projections in the cat. Supporting experimental light microscopical studies of silver impregnated sections following a large lesion of the cerebellar nuclei and light microscopical autoradiographic studies of the thalamus following injections of tritiated leucine in parts of the cerebellar nuclei, have been made as well. Following large lesions of the cerebellar nuclei, only the largest occuring type of bouton in the cat's VL and VA (type LR bouton) degenerates. Following such lesions, type LR boutons undergo a filamentous hypertrophy before becoming electrondense. One degenerating LR bouton establishes complex synapses with the dendrites of both thalamocortical relay cells and interneurons. Not all type LR boutons in VL and VA degenerate following lesions of the cerebellar nuclei. Light microscopical autoradiographic studies as well as experimental electron microscopical investigations indicate that cerebellothalamic fibers end in clusters within VL and VA, and that the areas of termination lie more rostrally within these thalamic nuclei than has been inferred from experimental studies of silver impregnated sections following lesions of the cerebellar nuclei. The findings are discussed with respect to relevant morphological and physiological data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00341384
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Observations on the fine structure of the substantia nigra in the cat (1970)
    Springer
    Experimental brain research 11 (1970), S. 229-248 
    Details
    ISSN: 1432-1106
    Keywords: Substantia nigra ; Cat ; Normal ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A light and electron microscopical investigation has been undertaken of the substantia nigra in the normal cat. The pars reticulata partly contains the arborization of dendrites whose cell bodies are located in the so-called pars compacta. There is a considerable overlap of the dendritic fields in the rostrocaudal direction, while the dendritic fields are very restricted in the mediolateral extension of the substantia nigra. The secondary and all subsequent branches of the dendrites of nigral cells are for considerable distances completely covered by boutons. Only few boutons contact the cell bodies. Three types of boutons are distinguished in the substantia nigra in the cat. Type I, about 90 % of the total, is of the terminal type, contains pleomorphic vesicles and establishes symmetrical synapses with nigral cell soma, dendritic trunks and spines. The type II bouton (about 10 % of the total number) is most commonly of the terminal type, contains spherical vesicles and establishes asymmetrical synapses with cell bodies and dendritic trunks of nigral cells. The type III bouton (about 2 % of the boutons) is always of the en passage type, contains pleomorphic vesicles and establishes symmetrical contacts with dendrites. All boutons in the cat's substantia nigra contain several large (700–1200 Å) dense core vesicles. Occasional axo-axonic contacts between type I and type III boutons are observed. Type I bouton is invariably presynaptic to the other. The findings are discussed in relation to some relevant problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01474384
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    An experimental electron microscopic study on the striatonigral projection in the cat (1970)
    Springer
    Experimental brain research 11 (1970), S. 249-262 
    Details
    ISSN: 1432-1106
    Keywords: Substantia nigra ; Striatonigral fibers ; Cat ; Degeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The ultrastructure of the cat's substantia nigra was investigated from 2–21 days following large lesions of the caudate nucleus and the putamen. From 4 days on a large number of degenerating boutons and degenerating unmyelinated fibers are seen in the substantia nigra, in the pars compacta as well as the pars reticulata. Both parts, mainly the latter, receive striatal afferents. The degeneration in the substantia nigra following striatal lesions is of the dark type. Most of the degenerating boutons apparently are of the type I (see Rinvik and Grofová, 1970) and end on all parts of the nigral cell surface, including the dendritic spines. One instance of a degenerating presynaptic bouton in an axo-axonic synapse has been found. Some degenerating boutons also probably belong to the type II bouton, while degenerating boutons of type III were never seen following the striatal lesions. The electron microscopic identification of early axonal degeneration in the central nervous system, is discussed with reference to the paper of Cohen and Pappas (1969). Problems concerning the pars compacta versus the pars reticulata of the substantia nigra are taken up. The possible sources of origin of the different types of boutons in the cat's substantia nigra, is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01474385
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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