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  • 1
    Electronic Resource
    Electronic Resource
    Gross dissection and immunohistochemical studies on branch fusion type of ventral and dorsal pancreatic ducts: A case report (1991)
    Springer
    Surgical and radiologic anatomy 13 (1991), S. 333-337 
    Details
    ISSN: 1279-8517
    Keywords: Ventral and dorsal pancreas ; Branch fusion of pancreatic duct ; Ansa pancreatica ; Pancreatic polypeptide (PP) cell
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Un cas d'anastomose entre les canaux pancréatiques ventral et dorsal par l'intermédiaire de deux branches inférieures a fait l'objet d'une étude à la fois macroscopique et immuno-histochimique, basée sur l'organogénèse du pancréas. Radiologiquement, l'anastomose semblait être constituée par une branche inférieure du conduit pancréatique ventral et une branche inférieure du conduit pancréatique dorsal. La cartographie des cellules pancréatiques polypeptidiques dans le matériel obtenu par duodéno-pancréatectomie, a permis de constater que la branche anastomotique était une branche du conduit pancréatique dorsal. Ainsi, il s'agissait non pas d'une anastomose entre deux branches inférieures, mais d'une anastomose entre une branche inférieure du conduit pancréatique dorsal et le conduit pancréatique ventral. La notion d'anse pancréatique est remise en question par les auteurs.
    Notes: Summary A case of fusion via two inferior branches between the ventral and dorsal pancreatic ducts was studied both macroscopically and immunohistochemically, based on the organogenesis of the pancreas. Radiologically, the branch fusion seemed to be composed of an inferior branch of the ventral pancreatic duct and an inferior branch of the dorsal pancreatic duct. By mapping pancreatic polypeptide cells in the material obtained by pancreatoduodenectomy, however, the branch was identified as a branch of the dorsal pancreatic duct. Thus, fusion between two inferior branches was not established, but was found to consist of an inferior branch of the dorsal pancreatic duct connected with the ventral pancreatic duct. We therefore challenge the concept of the ansa pancreatica.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01627768
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of early monocular deprivation on development of cortico-geniculate projections in the cat (1981)
    Springer
    Experimental brain research 43 (1981), S. 451-454 
    Details
    ISSN: 1432-1106
    Keywords: Monocular deprivation ; Cortico-geniculate projections ; Visual cortex ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In 16 cats monocularly deprived from 2 to 3 weeks of age, we studied 53 striate cortical cells which were identified as projecting to the dorsal lateral geniculate nucleus (LGN) on the basis of antidromic activation from LGN and of histological localization within cortical layer VI. As in the normal cat, these cortico-geniculate cells could be classified as slow, intermediate or fast, according to their axonal conduction velocities. The sampling ratio of the slow cells (mostly unresponsive to visual stimuli) was much higher than normal. On the other hand, the ratio of the intermediate (one half were simple cells) and fast cells (all except one were complex cells) was significantly lower than the norm. Also, the average axonal conduction velocities of the complex and simple cells were significantly slower than normal. These results suggest that normal maturation of cortico-geniculate cells, particularly fast and intermediate ones, is retarded or arrested by monocular visual deprivation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238390
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Laminar differences in development of afferent innervation to striate cortex neurones in kittens (1982)
    Springer
    Experimental brain research 45 (1982), S. 433-446 
    Details
    ISSN: 1432-1106
    Keywords: Visual cortex ; Development ; Cortical lamination ; Kitten
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We studied 587 cells in the striate cortex of 47 kittens, ranging in age postnatally from the 8th day to the 20th week, to explore differences in rates of functional maturation of cells and afferents among cortical layers. For all cells studied we determined spontaneous activity level, visual responsiveness, responsiveness to electrical stimulation of the afferent pathways and histologically reconstructed their laminar localization. At the 2nd–3rd week postnatally, single shocks applied to the dorsal lateral geniculate nucleus (LGN) elicited relatively inconsistent responses with long latencies in most of the cells in all layers, except in layer V where responses were consistent. In layers IVab, V, and VIu (the upper half of layer VI) the LGN-latency decreased very rapidly in the 4th week, while in layer IVc such a decrease occurred in the 5th week. In layers II+III and VIℓ (the lower half of layer VI) a less substantial decrease in latency occurred during the 4th and 5th week. At 2 weeks, nearly half of layer V cells had orientation-specific visual responses or spontaneous activity, but such cells were rare in other layers. The proportions of the specific or spontaneously active cells matured successively in the order of layers V → IVab and VIu →IVc →II+III and VIℓ. We conclude that the maturation of functional properties of cortical cells may occur successively in the above-mentioned laminar order, and that cell size and connectivity with afferents may be factors influencing the rate of functional maturation of cortical cells. The intracortical synaptic delay was estimated for each of the cells driven mono-synaptically from the LGN. The average delay decreased most rapidly during the 4th and 5th week. Conduction velocities of afferents innervating the mono-synaptic cells in layers IVab and IVc were calculated. The velocity of the former afferents increased very quickly and reached a value suggesting myelination at 4 weeks, while that of the latter afferents at 5 weeks. Since each type of LGN cell is known to project segregatedly to layers IVab and IVc, respectively, this suggests that Y-cells of LGN may mature earlier than X-cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01208604
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    Paper (German National Licenses)
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