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- W2009174912 abstract "To determine the initial growth pattern of pioneering axons and investigate the factors that may influence their guidance, the lateral margin of a stage 16+ chick brachial spinal cord was examined in serial thin sections. The specimen was prepared with hypertonic fixative which partially shrank the tissue and increased extracellular space. The retention of surface contact after shrinkage was used as an index of the relative adhesiveness between cells in situ. Six axons and growth cones were found within the reconstructed tissue; five were oriented dorsoventrally and one apparent motor neuron growth cone was oriented radially. The five circumferential axons originated from presumptive interneurons distributed in a dispersed pattern along the neural tube lateral wall. Four terminated with growth cones, and each extended a short distance (less than 30 microns) ventrally along the outer margin. No contact was found between these nonfasciculating axons or growth cones. Thus, the earliest intracentral axons appear to grow dorsoventrally from the outset with no appreciable wandering. Morphological features that may indicate their mechanism of guidance, including preformed cellular guides, extracellular channels, contact with basal lamina, and intercellular junctions were not found. The preferential retention of surface contact between adjacent endfeet, as well as between pioneering circumferential axons and neuroepithelial cells, suggests that these particular surfaces are mutually adherent. These findings are consistent with a proposed dorsal-to-ventral adhesive gradient mechanism of circumferential axonal guidance." @default.
- W2009174912 created "2016-06-24" @default.
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- W2009174912 date "1987-10-01" @default.
- W2009174912 modified "2023-09-27" @default.
- W2009174912 title "Differential adhesivity of neuroepithelial cells and pioneering circumferential axons" @default.
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- W2009174912 doi "https://doi.org/10.1016/0012-1606(87)90397-6" @default.
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