Architecture of the media of the arterial vessels in the dog brain: A scanning electron-microscopic study |
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Authors: | Dr Toshitaka Shiraishi Saburo Sakaki Yasuo Uehara |
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Affiliation: | (1) Department of Neurosurgery, Ehime University School of Medicine, Shigenobu, Ehime, Japan;(2) Department of Anatomy, Ehime University School of Medicine, Shigenobu, Ehime, Japan;(3) Department of Neurosurgery, Ehime University School of Medicine, Shigenobu, 791-02 Ehime, Japan |
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Abstract: | Summary The architecture of the media of arterial vessels in dog brain was investigated using scanning electron microscopy. The arrangement and shape of the circularly-oriented smooth muscle cells varied with vessel diameter: The arteries (>100 m in diameter) had 4–10 layers of spindle-shaped smooth muscle cells; the muscular arterioles (30–100 m), 2–3 layers of spindle-shaped smooth muscle cells; the terminal arterioles (10–30 m), a compact layer of spindle-shaped smooth muscle cells with more dominant nodular or rod-like processes and thin lateral processes; and the precapillary arterioles (5–15 m), a less compact layer of branched smooth muscle cells.Longitudinally-oriented muscles were observed in the medio-adventitial border. The distribution and arrangement of these muscles varied with vessel size: in the large arteries (> 300 m in diameter), at the branching sites only; in the small arteries (100–300 m), at both the branching and non-branching sites; in the muscular arterioles, at both the branching and non-branching sites in a reticular arrangement with some muscle cells having an asteroid appearance; in the terminal aterioles, only asteroid-like muscle cells were found at the branching and non-branching sites. |
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Keywords: | Dog brain Architecture of the media Arterial vessel Smooth muscle Scanning electron microscopy |
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