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  • 1995-1999  (3)
  • Agenesis  (2)
  • Cardiovascular  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Surgical and radiologic anatomy 19 (1998), S. 385-394 
    ISSN: 1279-8517
    Keywords: Internal carotid a. ; Agenesis ; Carotid canal ; Rete mirabile ; Anastomoses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report six cases of segmental agenesis of the internal carotid a. discovered in adult patients: one case of cervical segmental agenesis (no. 1), one case of cervical and petrosal segmental agenesis (no. 2), two cases of vertical cavernous segmental agenesis (nos. 3 and 4) and two cases of distal segmental agenesis, one unilateral (no. 5) and the other bilateral (no. 6). The collateral pathways observed were: the ascending pharyngeal a. which constitutes an “intratympanic course” of the internal carotid a. (no. 1), an intercarotid anastomosis (no. 2), an arterial network at the base of the skull, the so-called “rete mirabile” (nos. 3 and 4) and the posterior communicating a. (nos. 5 and 6). Recognition of these rare dysgeneses relies upon the following radio-anatomic characteristics: reduced caliber of the a., inconsistent sparing of the carotid body, reduced diameter or even absence of the carotid canal and above all, the presence of collateral pathways. The collateral pathways allow an understanding of the segmental nature of carotid a. development and a distinction between congenital and acquired stenoses.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Surgical and radiologic anatomy 19 (1997), S. 385-394 
    ISSN: 1279-8517
    Keywords: Internal carotid a. ; Agenesis ; Carotid canal ; Rete mirabile ; Anastomoses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Six observations d'agénésies segmentaires de l'artère carotide interne, découvertes chez l'adulte, sont rapportées : un cas d'agénésie du segment cervical (no 1), un cas d'agénésie des segments cervical et pétreux (no 2), deux cas d'agénésie du segment caverneux vertical (no 3 et 4) et deux cas d'agénésie distale de l'artère, unilatérale (no 5) et bilatérale (no 6). Les voies de suppléance observées sont : l'artère pharyngienne ascendante réalisant un “trajet intratympanique” de l'artère carotide interne (no 1), une anastomose intercarotidienne (no 2), un réseau artériel de la base du crâne, dit “réseau admirable” (no 3 et 4) et l'artère communicante postérieure (no 5 et 6). La reconnaissance de ces rares dysgénésies repose sur les caractéristiques radio-anatomiques suivantes : réduction de calibre de l'artère, respect inconstant de sa portion bulbaire, réduction des dimensions voire absence du canal carotidien et surtout voies anastomotiques utilisées. Les anastomoses observées permettent en effet de comprendre le caractère segmentaire du développement de l'artère et de distinguer les sténoses congénitales et les sténoses acquises.
    Notes: Summary We report six cases of segmental agenesis of the internal carotid a. discovered in adult patients: one case of cervical segmental agenesis (no. 1), one case of cervical and petrosal segmental agenesis (no. 2), two cases of vertical cavernous segmental agenesis (nos. 3 and 4) and two cases of distal segmental agenesis, one unilateral (no. 5) and the other bilateral (no. 6). The collateral pathways observed were: the ascending pharyngeal a. which constitutes an “intratympanic course” of the internal carotid a. (no. 1), an intercarotid anastomosis (no. 2), an arterial network at the base of the skull, the so-called “rete mirabile” (nos. 3 and 4) and the posterior communicating a. (nos. 5 and 6). Recognition of these rare dysgeneses relies upon the following radio-anatomic characteristics: reduced caliber of the a., inconsistent sparing of the carotid body, reduced diameter or even absence of the carotid canal and above all, the presence of collateral pathways. The collateral pathways allow an understanding of the segmental nature of carotid a. development and a distinction between congenital and acquired stenoses.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 242 (1995), S. 251-258 
    ISSN: 0003-276X
    Keywords: Nucleus ambiguus ; Vagal-solitary complex ; Cardiovascular ; Respiratory ; Fluorescent tracers ; Horseradish peroxidase ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Background: Vagal visceromotor reflexes are dependent upon reciprocal neural connections existing between the medulla and the hypothalamus. Medullohypothalamic neurons may provide feedback cues to the hypothalamus regarding the activity of vagal motor neurons. As yet, however, studies investigating the spatial relationships between medullohypothalamic neurons and vagal motor neurons have not been performed.Methods: A variety of retrogradely transported tracers were used for the purpose of mapping the relative locations of medullovagal and medullohypothalamic neurons. Tracers were injected into the cervical vagus nerve and/or the posterolateral hypothalamus, and subsequently the retrogradely labeled medullary neurons were plotted.Results: Labeling of the two neuronal populations was primarily observed within the ventrolateral and dorsomedial medulla. Within the ventrolateral medulla, medullovagal neurons were found within the retrofacial nucleus and nucleus retroambiguus, whereas medullohypothalamic neurons were located subjacent to these nuclei. Within the dorsomedial medulla, labeling of the two neuronal populations was primarily limited to the vagal-solitary complex. At this location medullovagal neurons were found within the dorsal vagal nucleus, whereas medullohypothalamic neurons were largely confined to the caudal aspect of the solitary nucleus.Conclusions: Because of the spatial proximity existing between medullovagal and medullohypothalamic neurons, it is suggested that functional interrelationships may exist between these two neuronal populations. Specifically, it is suggested that the medullohypothalamic neurons identified in this study may support vagal-related functions by providing feedback cues to the posterolateral hypothalamus. © 1995 Wiley-Liss, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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