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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Raspanti, M. Marchini, M. Della Pasqua, V. Strocchi, R. Ruggeri, A. |
| Description | Country affiliation: Italy Author Affiliation: Raspanti M ( Istituto di Anatomia Umana Normale, Università di Bologna, Italy.) |
| Abstract | The sclera, the outermost sheath of the optic nerve and the dura mater have been investigated histologically and ultrastructurally. Although these tissues appear very similar under the light microscope, being dense connective tissues mainly composed of collagen bundles and a limited amount of cells and elastic fibres, they exhibit subtle differences on electron microscopy. In the dura and sclera collagen appears in the form of large, nonuniform fibrils, similar to those commonly found in tendons, while in the optic nerve sheath the fibrils appear smaller and uniform, similar to those commonly observed in reticular tissues, vessel walls and skin. Freeze-fracture also reveals these fibrils to have different subfibrillar architectures, straight or helical, which correspond to 2 distinct forms of collagen fibril previously described (Raspanti et al. 1989). The other extracellular matrix components also vary with the particular collagen fibril structure. Despite their common embryological derivation, the dura mater, optic nerve sheath and sclera exhibit diversification of their extracellular matrix consistent with the mechanical loads to which these tissues are subjected. Our observations indicate that the outermost sheath of the optic nerve resembles the epineurium of peripheral nerves rather than the dura to which it is commonly likened. |
| File Format | HTM / HTML |
| ISSN | 14697580 |
| e-ISSN | 14697580 |
| Journal | Journal of Anatomy |
| Volume Number | 181 Pt 2 |
| Language | English |
| Publisher | Wiley |
| Publisher Date | 1992-10-01 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | Open |
| Subject Keyword | Discipline Anatomy Anatomy & Histology Dura Mater Ultrastructure Extracellular Matrix Optic Nerve Sclera Animals Freeze Fracturing Laryngeal Nerves Microscopy, Electron Comparative Study |
| Content Type | Text |
| Resource Type | Article |
| Subject | Anatomy Cell Biology Developmental Biology Histology Molecular Biology Ecology, Evolution, Behavior and Systematics |
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