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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Surgical and radiologic anatomy 19 (1998), S. 295-298 
    ISSN: 1279-8517
    Keywords: Ethmoidal labyrinth ; Frontal sinus ; Anterior cranial fossa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In the “standard” anatomic description, the frontal bone and cribriform plate of the ethmoid bone form the base of the anterior cranial fossa. We studied the development of the ethmoidal bone as well as its relations to the frontal bone in macerated disarticulated skull bones and macerated skull bases of 35 individuals between 9 and 35 years of age. In 19 cases the ethmoidal cells were completely or partly uncovered by the frontal bone. In 6 of 19 cases the frontal bone did not cover any of the ethmoidal cells; in 10 further cases the frontal bone covered only the anterior and in 3 cases the anterior and middle ethmoidal cells. In a 60-year-old subject the ethmoidal cells were incorporated in the base of the anterior cranial fossa, a rare finding. Thus, a depressed lamina cribrosa is not the only danger in ethmoidectomy. Based on the present data ethmoidal cells uncovered by the frontal bone may involve a serious risk during ethmoidectomy even if the surgeon remains lateral to the insertion of the middle concha. The discrepancy between common descriptions of this region and our own findings may be related to imprecise data concerning the life stage of the cases described in the literature.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Surgical and radiologic anatomy 19 (1997), S. 295-298 
    ISSN: 1279-8517
    Keywords: Ethmoidal labyrinth ; Frontal sinus ; Anterior cranial fossa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Dans la description anatomique "standard", l'os frontal et la lame criblée de l'os ethmoïde constituent le plancher de la fosse crânienne antérieure. Nous avons étudié le développement de l'os ethmoïde ainsi que ses relations avec l'os frontal sur des crânes désarticulés et sur des bases de crânes de 35 individus âgés de 9 à 35 ans. Dans 19 cas, les cellules ethmoïdales étaient complètement ou partiellement découvertes par l'os frontal. Dans 6 de ces 19 cas, l'os frontal ne couvrait pas du tout les cellules ethmoïdales ; dans les 10 autres cas, l'os frontal recouvrait seulement les cellules antérieures, et dans 3 cas, les cellules antérieures et moyennes de l'os ethmoïde. Chez un individu de 60 ans, les cellules ethmoïdales étaient également incorporées dans le plancher de la fosse crânienne antérieure, ce qui est très rare. De ce fait, une lame criblée basse n'est pas le seul danger au cours de l'ethmoïdectomie. D'après nos résultats, les cellules ethmoïdales découvertes par l'os frontal peuvent représenter un risque sérieux au cours d'une ethmoïdectomie même si le chirurgien, au cours de la procédure, reste latéral par rapport à l'insertion du cornet nasal moyen. Les contradictions entre la description classique de cette région et nos résultats pourraient suggérer l'existence d'imprécisions dans la littérature, liées à l'absence de prise en compte de l'âge des crânes étudiés.
    Notes: Summary In the “standard” anatomic description, the frontal bone and cribriform plate of the ethmoid bone form the base of the anterior cranial fossa. We studied the development of the ethmoidal bone as well as its relations to the frontal bone in macerated disarticulated skull bones and macerated skull bases of 35 individuals between 9 and 35 years of age. In 19 cases the ethmoidal cells were completely or partly uncovered by the frontal bone. In 6 of 19 cases the frontal bone did not cover any of the ethmoidal cells; in 10 further cases the frontal bone covered only the anterior and in 3 cases the anterior and middle ethmoidal cells. In a 60-year-old subject the ethmoidal cells were incorporated in the base of the anterior cranial fossa, a rare finding. Thus, a depressed lamina cribrosa is not the only danger in ethmoidectomy. Based on the present data ethmoidal cells uncovered by the frontal bone may involve a serious risk during ethmoidectomy even if the surgeon remains lateral to the insertion of the middle concha. The discrepancy between common descriptions of this region and our own findings may be related to imprecise data concerning the life stage of the cases described in the literature.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    European archives of oto-rhino-laryngology and head & neck 250 (1993), S. 209-212 
    ISSN: 1434-4726
    Keywords: Ethmoid labyrinth ; Sphenoid sinus ; Computed tomography ; Endoscopic nasal surgery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Three hundred macerated and partly isolated postmortem mid-facial bones were studied for the development, variations and dimensions of the structures of the nasal cavity. On 184 axial CT scans of bones (102 male, 82 female) from patients ranging in age from 1 to 90 years old, the dimensions of the ethmoid labyrinth and sphenoid sinus were studied in detail in order to determine which anatomic situation might be unsafe during clinical endoscopic interventions. Six anatomic variations were identified. Most unsafe for surgery seemed to be the following types: type 111, in which the anterior diameter of the ethmoid labyrinth was large and the posterior ethmoid and sphenoid diameters were relatively narrow; type V, in which both ethmoid dimensions were large and the sphenoid diameter was narrow: type VI, in which the ethmoid labyrinth had an “hour-glass” shape. Present findings indicate that CT orientation before any endoscopic intervention might help to avoid serious complications.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    European archives of oto-rhino-laryngology and head & neck 256 (1999), S. 160-161 
    ISSN: 1434-4726
    Keywords: Key words Occipital bone ; Clivus canal ; Notochord
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    European archives of oto-rhino-laryngology and head & neck 256 (1999), S. 205-208 
    ISSN: 1434-4726
    Keywords: Key words Facial pain ; Trigeminal neuralgia ; Anatomic variations of the skull ; Lateral lamina of the pterygoid process ; Foramen pterygospinale ; Spina of the sphenoidal bone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In our large collection of macerated human adult skulls and disarticulated skulls of young individuals we found cases with an extremely large lateral lamina of the pterygoid process. The medial wall of the infratemporal fossa was defined as its formation by the lateral lamina of the pterygoid process and the medial pterygoid muscle. The muscular part formed two-thirds and the lateral lamina one-third of this wall. In cases of a very large lateral lamina in our specimens nearly the whole medial wall was osseous. The third portion of the trigeminal nerve gives off the lingual nerve and alveolar mandibular nerve in the region of the infratemporal fossa. These two nerves generally passed between the lateral and medial pterygoid muscles to their terminal sites. In cases of extremely large lateral laminae the nerves had to make a curve in their course, following the shape of the enlarged lamina. During contraction of the pterygoid muscles both nerves can be compressed. Since the lingual nerve runs between muscular elements, tension and compression is probably avoided. In contrast, the mandibular nerve fixed between the oval and mandibular foramina cannot avoid tension and compression. The result is possible pain, especially during chewing, and may finally create a trigeminal neuralgia. Similar symptoms could be provoked by a foramen pterygospinale or ovalis canal replacing the foramen ovale.
    Type of Medium: Electronic Resource
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