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Fig. 8 | BMC Zoology

Fig. 8

From: Microscopic Observations on Form and Structure of the Worm Enchytraeus buchholzi (Clitellata: Enchytraeidae)

Fig. 8

Structure of XII and XIII, the clitellum, largely showing ovary, ventral nerve cord, cover epithelial cells, groups of germ cells with developing oocytes, mature eggs, nurse cells, penial bulbs, unicellular glands, vessels, intestine, muscles, nephridium, and sperm funnels (all std-in-HE). A. Near anterior margin of XII, transversal section, anterior view. B. Anterior part of XII, ventral view. C. XII and XIII, longitudinal section, lateral view. D. Penial bulbs and intestine in XII, transversal section, anterior view. E. XII, transversal section, anterior view. F. XIII, transversal section, anterior view. G—J. Top-left parts of XIII, transversal series sections, anterior view, showing continuous changes of nurse cells in different layers. am, anterior margin of XII; cec, cover epithelial cell; chl, chloragogen cell; em, egg membrane; ggc, groups of germ cells with developing oocytes; int, intestine; ipv, intestinal parietal vessel; mu, muscle; meg, mature egg; miv, microvillus; ne, nephridium; n, nucleus; nc, nurse cell; ov, ovary; pb, penial bulb; pm, posterior margin of XIII; spf, sperm funnel; ucg, unicellular gland; vnc, ventral nerve cord; vv, ventral vessel; yog, yolk granule

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BMC Zoology

ISSN: 2056-3132

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