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Fig. 4 | Frontiers in Zoology

Fig. 4

From: Immunohistochemical and ultrastructural properties of the larval ciliary band-associated strand in the sea urchin Hemicentrotus pulcherrimus

Fig. 4

Transmission electron micrograph of the ciliary band (CB) of 6-arm pluteus. (a) Columnar CB cells (blue) adjacent to squamous cells on the aboral side (Aboral) and the rectangular cell (red) on the oral side (Oral). Inset, toluidine blue-stained thick cross-section of the arm shown by (a–e). (b) High-magnification of the region indicated by box (b) in (a). The rectangular cell possesses adherens junctions (AJ) between a CB cell (arrow 1) and a squamous cell (arrow 2). (c) High-magnification of the region indicated by box (c) in (a). Squamous cell adjacent to the CB cell (arrow). (d) Cross-section of the rectangular cell (red) adjacent to the CB cell (blue). (e) Cross-section of the rectangular cell (red) adjacent to the CB cell (blue) 40 μm away from the image in (d). (f) Cross-section of the perikaryon of the rectangular cell (red) adjacent to CB cells (blue). (g) High-magnification of the apical cytoplasm of the CB cells indicated by box (g) in (a). Arrows, basal bodies; double-arrow, AJ. (h) High-magnification of an AJ (arrow) between the rectangular cell and adjacent squamous cell shown by box (h) in (d). (i) High-magnification of an AJ (arrow) between the rectangular cell and the CB cell indicated by box (i) in (e). Aboral, the aboral ectoderm region; green arrows in (b, d-f), electron-translucent vesicles; N, nucleus in (a), (d–f); Oral, the oral ectoderm region, red arrows in (b, d, e), electron-dense vesicles

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