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  • 1
    Electronic Resource
    Electronic Resource
    Acetylcholinesterase-histochemical differential staining of subdivisions within the nucleus rotundus in the chick (1990)
    Springer
    Anatomy and embryology 181 (1990), S. 129-135 
    Details
    ISSN: 1432-0568
    Keywords: Chemoarchitectony ; Acetylcholinesterase ; Nucleus rotundus ; Thalamus ; Tectothalamic pathway
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Histochemical mapping of AChE activity in the chick diencephalon shows differential staining of several subregions witin the nucleus rotundus. The topography and extent of these subdivisions were studied in transverse, horizontal and sagittal sections. A correlation with rotundic hodologic subdivisions reported in the literature is feasible, whereas several other chemoarchitectonic or functional markers show a homogeneous distribution throughout the n. rotundus. Moreover, cholinergic markers do not detect cholinergic afferents within the rotundic neuropile. Late embryonic appearance of the AChE heterogeneity suggests a modulation of neuropile AChE levels subsequent to synaptogenetic adjustment of differential hodology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00198952
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Observations on the fate of nucleus superficialis magnocellularis of Rendahl in the avian diencephalon, bearing on the organization and nomenclature of neighboring retinorecipient nuclei (1991)
    Springer
    Anatomy and embryology 183 (1991), S. 221-233 
    Details
    ISSN: 1432-0568
    Keywords: Neurogenesis ; Development ; Diencephalon ; Thalamus ; Visual system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The cytoarchitectonic development of n. superficialis magnocellularis (dorsal thalamus, posterior parencephalon) was studied from 3 days of incubation up to the mature state after hatching in the chick. A hypothesis of Kuhlenbeck (1937) on a partial transformation or contribution of SM cells into a different neighbouring griseum was tested, in the wider context of divergent interpretations of diencephalic development either within Herrick's (1910) longitudinal columnar theory, or within a modified neuromeric conception (Puelles et al. 1987a). Nucleus SM develops early within the alar region of the posterior parencephalon, forming an outer mantle stratum over the main telencephalopetal thalamic inner cell mass. Thymidine-labeling data pin-point its generation period mainly between 3 and 4.5 days of incubation. Throughout its subsequent development, SM remains within the primary interneuromeric limits that separate it from ventral thalamus and pretectum. After 8 days of incubation, SM subdivides into superficial (compact) and deep (disperse) sublaminae. The superficial one becomes much compressed between n. geniculatus ventralis and n. synencephali superficialis. Some of its cells migrate interstitially into the optic tract (12–16 days in ovo) and later disappear. The corresponding mature remnant was called n. interstitialis tractus opticus (ITO). The deep sublamina of SM forms a cap around n. rotundus. It becomes increasingly dispersed due to many passing fibers, and may be recognized in the mature brain as an area perirotundica (ApR). Clarification of the fate of embryonic SM bears on the confused terminology for various visual diencephalic nuclei. It is argued that the terms n. geniculatus dorsalis p. principalis and p. intercalaris, n. superficialis magnocellularis (in its wrong usage), n. lamminaris precommissuralis, n. lentiformis mesencephali p. medialis, p. parvocellularis and p. magnocellularis should be considered obsolete, on various embryological and hodologic grounds. An embryologically consistent terminology is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00192210
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  • 3
    Electronic Resource
    Electronic Resource
    Retinal and tectal connections of embryonic nucleus superficialis magnocellularis and its mature derivatives in the chick (1991)
    Springer
    Anatomy and embryology 183 (1991), S. 235-243 
    Details
    ISSN: 1432-0568
    Keywords: Thalamus ; Comparative anatomy ; Retinal projection ; Tectum, afferents ; Development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In a companion paper (Puelles et al., this issue), the cytoarchitectonic development of the thalamic primordium called nucleus superficialis magnocellularis (SM) and its adult configuration in the chick were studied, correcting the misinterpretations that have impeded proper study of this neuronal group. Given its superficial position in the diencephalon, in contact with the optic tract and neighbouring retinorecipient grisea (SS, GV), as well as with the tecto-recipient n. rotundus, SM was suspected to have connections with centers of the visual pathway. In this paper we report the existence of a non-topographic retinal projection over the superficial adult derivate of SM (n. interstitialis tractus opticus, ITO) and a non-topographic, diffuse projection of the whole SM-derived population (area perirotundica, ApR, and ITO) onto the optic tectum. The latter was demonstrated throughout the late embryonic period in which SM loses its embryonic unitary character and becomes dispersed into its ill-defined, definitive adult portions (ITO, ApR). Golgi-like HRP- or DiI-labeling of SM cells showed a protracted immature appearance of their dendrites, expressed coincidently with a capacity to translocate superficially into the optic tract.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00192211
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  • 4
    Electronic Resource
    Electronic Resource
    Location of the rostral end of the longitudinal brain axis: Review of an old topic in the light of marking experiments on the closing rostral neuropore (1987)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 194 (1987), S. 163-171 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The rostral end of the forebrain was classically defined on the basis of descriptive data. Different assumptions on the mode of closure of the rostral neuropore caused three different theories of the rostral end of the forebrain to be formulated (His 1893a; von Kupffer, '06; Johnston, '09). Some recent descriptive and experimental data have put these theories into question.A piece of black nylon thread was inserted through the rostral neuropore of chick embryos and was fixed to its ventral lip. These operations were done at all intermediate stages during the process of closure of the rostral neuropore. The embryos were sacrificed at a later stage, by which time the neuropore had disappeared.In the cleared specimens the threads always lay at the same site, namely the upper border of lamina terminalis, irrespective of the stage at which the marker was inserted. These results stand against His's conception ((1893a, b) of a sutura terminalis and support the single mechanism of sutura dorsalis during closure of the rostral neuropore. The marking data therefore imply that the topologic rostral end of the forebrain lies at the upper limit of lamina terminalis, as proposed by von Kupffer, '06).
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051940205
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    Paper (German National Licenses)
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