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Tangential orientation and spatial order in dendrites of cat auditory cortex: A computer microscope study of Golgi-impregnated material (1979)

Glaser, E. M. ; Loos, H. ; Gissler, M.

Springer

Experimental brain research 36 (1979), S. 411-431

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ISSN: 1432-1106

Keywords: Auditory cortex ; Computer microscopy ; Dendrites ; Golgi ; Orientation

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary In the tangential plane (parallel to the pial surface) dendrites in the primary auditory cortex (A1) of cat were found to exhibit preferentially oriented growth. This was shown by means of a computer microscope study of Golgi-Cox stained neurons as seen in 100 μm and 300 μm thick tangential sections. Two techniques were used to represent the 3-dimensional structure of dendrites: the “dendritic stick” and the “dendritic trumpet”. The former dismembers a dendrite into its individual segments; the latter considers a dendrite as an entity and represents it by its centroid, its moments and the spatial dispersion of its branches. Both statistical and Fourier analyses of the data show that within the tangential plane there is a significant and consistent orientation of the dendritic sticks in a dorso-ventral direction which seems correlated with the cortical isofrequency contours observed in electrophysiological maps of the A1 region. The dendritic trumpet analyses also show a distinctly non-random vertical distribution of pyramidal cell basal dendrites but not of stellate cell dendrites.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00238513

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Axons from eyes grafted in Xenopus can grow into the spinal cord and reach the optic tectum (1978)

GIORGI, P. P. ; VAN DER LOOS, H.

[s.l.] : Nature Publishing Group

Nature 275 (1978), S. 746-748

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ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] Fig. 1 Tadpole of Xenopus laevis with a third eye grafted at embryonic stage 23 (ref. 13) and now (stage 58) growing above the spinal cord. The brain and the normal eyes with their optic nerves can be seen through the transparent tissue of the tadpole head. Embryos were obtained in our laboratory ...