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  • Articles: DFG German National Licenses  (4)
  • 1970-1974  (4)
  • 1970  (4)
  • 1
    Electronic Resource
    Electronic Resource
    The origin and distribution of adrenergic nerve fibres in the guinea-pig colon (1970)
    Springer
    Histochemistry and cell biology 21 (1970), S. 295-306 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A detailed study of the origin and distribution of sympathetic fibres in the distal colon of the guinea-pig has been made using the fluorescent histochemical method for localizing catecholamines. The extrinsic adrenergic fibres of the colonie sympathetic nerves follow the inferior mesenteric artery and its branches to the colon. Some of the extrinsic adrenergic fibres are associated with the parasympathetic fibres of the pelvic nerves near the colon. Complete adrenergic denervation follows the removal of the inferior mesenteric ganglion or the destruction of the nerves running with the inferior mesenteric artery. No fluorescent fibres, other than those associated with blood vessels, were observed in air-dried stretch preparations of the isolated longitudinal muscle. However, a substantial number of varicose, terminal fibres, not associated with blood vessels, were observed in the circular muscle. Some varicose fibres, apart from those associated with ganglion cells, were observed in the myenteric plexus. These fibres were seen in the bundles of nerves running between the nodes of the plexus and also as single fibres which branched from the plexus to end in areas free of ganglion cells. Three plexuses of adrenergic nerve fibres have been distinguished in the submucosa: a dense plexus of terminal fibres innervating both the veins and arteries; a plexus consisting of innervated nodes of ganglion cells, connected by bundles of fluorescent and non-fluorescent nerves; and a plexus of varicose and non-varicose fibres, which is not associated with ganglion cells. Some groups of ganglion cells in the submucosa were without adrenergic innervation. A plexus of varicose fibres forms a meshwork in the lamina propria of the mucosa. The muscularis mucosae is sparsely innervated. Most of the blood vessels in the mucosa are not associated with adrenergic fibres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280899
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The excitatory input to a single smooth muscle cell (1970)
    Springer
    Pflügers Archiv 314 (1970), S. 1-13 
    Details
    ISSN: 1432-2013
    Keywords: Smooth Muscle ; Neuromuscular Transmission ; Electrophysiology ; Autonomic Nerves
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Intracellular microelectrodes were used to analyse the excitatory input to single cells of the mouse vas deferens. Excitatory junction potentials (EJP's) were evoked by both orthodromic and antidromic impulses in terminal axons lying within the musculature of the vas deferens, indicating that transmitter is released from the length of the terminal axon not just from the axon termination. The amplitude of the EJP was altered by altering the strength of stimulation. By using this variation, it was found that 15–22 nerve fibres gave a detectable contribution to the amplitude of the EJP in a single cell. The maximum amplitude of the EJP was 45 mV and the maximum depolarization caused by transmission from a single axon was 5 mV. By depolarizing the whole tissue with noradrenaline, the reversal potential for the EJP was found to be −20 to −15 mV. The EJP was not reversed when a single cell was depolarized with an intracellular current pulse. Extracellular electrodes failed to record any reversal of the EJP, corresponding to current sinks. It is concluded that the EJP in a single cell arises both from the action of transmitter, released from terminal varicosities, on its membrane and from potential changes electrically coupled from adjacent cells via low resistance connections between the smooth muscle cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00587042
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The effect of external potassium ion concentration on autonomic neuro-muscular transmission (1970)
    Springer
    Pflügers Archiv 317 (1970), S. 310-326 
    Details
    ISSN: 1432-2013
    Keywords: Potassium Ion ; Autonomic Nerves ; Neuro-Muscular Transmission ; Excitatory Junction Potentials ; Kaliumion ; Autonome Nerven ; Neuromusculäre Übertragung ; Erregungsübertragungspotentiale
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effect of varying the potassium ion concentration on autonomic neuro-muscular transmission was studied in the vas deferens of the mouse. The smooth muscle cells had resting membrane potentials in normal solution of about 75 mV. The relationship between the membrane potential and the external potassium concentration was close to that predicted by the Nernst equation for external potassium concentrations above 20 mM. The relationship followed the trend predicted by the Goldman equation. The time of decay of the excitatory junction potential (EJP) in response to nervous stimulation decreased to one quarter when the potassium concentration was increased from 0 to 5 times that in normal solution. The transmission delay at the autonomic junction did not change, and the rise time of the EJP decreased only slightly, with increased external potassium concentration. The maximal amplitude of the EJP decreased with increased external potassium. Miniature EJPs (MEJPs) occurred spontaneously and had the same time course in each concentration of external potassium. In potassium-free solution spontaneous potentials, which were similar in time course to EJPs in the same solution, were also observed. It is concluded that the repolarizing phase of the EJP in normal solution is probably determined by the electrical properties of the smooth muscle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00586580
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The adrenergic innervation of the cardio-vascular system of the lizard Trachysaurus rugosus (1970)
    Springer
    Cell & tissue research 108 (1970), S. 150-176 
    Details
    ISSN: 1432-0878
    Keywords: Cardio-vascular innervation ; Reptilia ; Adrenergic nerves ; Fluorescence histochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The fluorescence histochemical method has been used to study the adrenergic innervation of the cardio-vascular system of the lizard, Trachysaurus rugosus. The cardiac muscle of the caval veins, sinus venosus, auricle and of the papillary muscle of the ventricle is heavily innervated. Some areas of the ventricles are uninnervated. The aortic arches and the elastic arteries are all adrenergically innervated. These arteries have nerve fibres in their mediae and innervated vasa vasorum at the medio-adventitial border. Adrenergic nerves usually do not penetrate the media of muscular arteries. The pattern of innervation of the peripheral arteries is similar to that of mammals, the principal exception being the pulmonary artery which is extremely densely innervated. All the major veins are innervated, but the innervation is generally far sparser than that of the arteries. Many of the small veins have little or no adrenergic innervation. The patterns of innervation seen in stretched, air dried preparations and in sections are described and possible functional implications are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335293
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    Paper (German National Licenses)
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