دورية أكاديمية
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Ultrastructure of an identified array of growth cones and possible substrates for guidance in the embryonic medicinal leech, Hirudo medicinalis.

التفاصيل البيبلوغرافية
العنوان: Ultrastructure of an identified array of growth cones and possible substrates for guidance in the embryonic medicinal leech, Hirudo medicinalis.
المؤلفون: Kopp DM; Department of Physiology and Biophysics, University of Alabama at Birmingham 35294., Jellies J
المصدر: Cell and tissue research [Cell Tissue Res] 1994 May; Vol. 276 (2), pp. 281-93.
نوع المنشور: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.
اللغة: English
بيانات الدورية: Publisher: Springer-Verlag Country of Publication: Germany NLM ID: 0417625 Publication Model: Print Cited Medium: Print ISSN: 0302-766X (Print) Linking ISSN: 0302766X NLM ISO Abbreviation: Cell Tissue Res Subsets: MEDLINE
أسماء مطبوعة: Original Publication: Berlin, New York, Springer-Verlag.
مواضيع طبية MeSH: Leeches/*embryology , Neurons/*ultrastructure, Animals ; Basement Membrane/ultrastructure ; Cell Movement ; Embryo, Nonmammalian/ultrastructure ; Leeches/ultrastructure ; Microscopy, Electron ; Morphogenesis ; Nervous System/embryology ; Nervous System/ultrastructure
مستخلص: The oblique muscle organizer (Comb- or C-cell) in the embryonic medicinal leech, Hirudo medicinalis, provides an amenable situation to examine growth cone navigation in vivo. Each of the segmentally iterated C-cells extends an array of growth cones through the body wall along oblique trajectories. C-cell growth cones undergo an early, relatively slow period of extension followed by later, protracted and rapid directed outgrowth. During such transitions in extension, guidance might be mediated by a number of factors, including intrinsic constraints on polarity, spatially and temporally regulated cell and matrix interactions, physical constraints imposed by the environment, or guidance along particular cells in advance of the growth cones. Growth cones and their environment were examined by transmission electron microscopy to define those factors that might play a significant role in migration and guidance in this system. The ultrastructural examination has made the possibility very unlikely that simple, physical constraints play a prominent role in guiding C-cell growth cones. No anatomically defined paths or obliquely aligned channels were found in advance of these growth cones, and there were no identifiable physical boundaries, which might constrain young growth cones to a particular location in the body wall before rapid extension. There were diverse associations with many matrices and basement membranes located above, below, and within the layer in which growth cones appear to extend at the light level. Additionally, a preliminary examination of myocyte assembly upon processes proximal to the growth cones further implicates a role for matrix-associated interactions in muscle histogenesis as well as process outgrowth during embryonic development.
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معلومات مُعتمدة: NS 28603 United States NS NINDS NIH HHS
تواريخ الأحداث: Date Created: 19940501 Date Completed: 19940802 Latest Revision: 20190720
رمز التحديث: 20231215
DOI: 10.1007/BF00306114
PMID: 8020064
قاعدة البيانات: MEDLINE
الوصف
تدمد:0302-766X
DOI:10.1007/BF00306114