By Dimas Fernández-Galiano
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This e-book used to be written by means of many striking investigators who've spent a long time to check diverse facets of blood‑tissue barrier functionality. they've got summarized a number of the most modern and engaging improvement of their fields of study together with the blood‑brain barrier, the blood‑retinal barrier, the intestine barrier, the blood‑biliary barrier, the blood‑follicle barrier, the blood‑epididymis barrier, the blood‑testis barrier, the tight junction barrier commonly in addition to limitations within the girl reproductive tract.
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29. Section through the base of a Sertoli cell and the adjacent extracellular matrix. Intermediate filaments (small arrows) are abundant in basal regions of the cell. In this micrograph, a decorated actin filament (arrowheads) is also evident. 5 pm. Fig. 30. Section through the central region of a Sertoli cell. Decorated actin filaments (arrowheads) are obvious among remnants of the various membranous organelles. 5 prn. 24 A. WAYNE VOGL FIG. 3 I . Illustration of the lower half of the apical Sertoli cell process containing a late spermatid and showing the major organizational features of tubulobulbar complexes.
Electron micrographs of ectoplasmic specializations associated with the blood-testis bamer (Fig. 40)and in regions of attachment to spermatids (Fig. 41). At both sites, ectoplasmic specializations lie immediately adjacent to the plasma membrane and consist of a layer of hexagonally packed actin filaments and a cistern of endoplasmic reticulum (ER). At the blood-testis barrier. ectoplasmic specializations (arrowheads) occur in Sertoli cells on each side of the junction. In areas of attachment to spermatids, only the Sertoli cell contains an ectoplasmic specialization.