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. 2007 Oct;211(4):503–517. doi: 10.1111/j.1469-7580.2007.00794.x

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© 2007 The Authors Journal compilation © 2007 Anatomical Society of Great Britain and Ireland

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Fig. 4 — Isthmus. (a) Light microscopy: cross section through the isthmus region close to the uterus showing surface epithelium (arrowheads) and crypts (C). ×165. (b) Semithin section through the isthmus region with surface epithelium (arrows) and crypts (arrowheads). ×250. (c–f) Isthmus surface epithelium. (c) Electron microcoscope pictures of isthmus surface epithelium at postestrus stage with ciliated cell (cc) and non-ciliated secretory cells (sc) still containing numerous secretory granules. Degeneration processes (whorls) have started (arrowheads). ×4500. (d) Lumen at metestrus filled with massive deciliation and secretion products (star). Hardly any secretory granules are left in the secretory cells. ×3300. (e) At the same time ciliogenesis has started. Note the multiplication of basal bodies moving to the apical surface (arrowheads). ×6900. (f) Scanning electron microscope: isthmus surface at late metestrus/early proestrus showing numerous non-ciliated cells with solitary cilia (arrows) and ciliated cells exhibiting neo-ciliogenesis at different stages (arrowheads). ×7200.