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Fig. 5 | Helgoland Marine Research

Fig. 5

From: The development of the oviducal gland in the Rajid thornback ray, Raja clavata

Fig. 5

Differentiated zones of the oviducal gland in the late developing stage. H&E. a Club zone lamellae. b Club zone secretory tubules. c Detail of a secretory tubule, in the club zone, with cilated and secretory cells. d Papillary zone lamellae. e Papillary zone secretory tubules. The caudal-most papillary tubules adjacent to the baffle zone are distinct from the remaining tubules. f Detail of a secretory tubule, in the papillary zone, with ciliated cells and secretory cells. Secretory granules stored inside secretory cells. g Baffle zone lamellae. The secretory ducts open into the lumen through the spinneret region, composed of two baffle plates. The baffle plates are surrounded by another pair of large folds, the plateau projections, lining the transverse groove. h Baffle serous secretory tubules. i Detail of a secretory tubule, in the baffle zone, with ciliated cells and secretory cells. Secretory cells contain secretory granules. j Structural organization of the terminal zone displaying the regular surface epithelium and the elongated tubular glands opening into the lumen. k Terminal zone secretory tubules, with both mucous and serous secretory cells. l Detail of the two types of secretory tubules, in the terminal zone, mucous and serous. Both tubules present ciliated cells and secretory cells. Secretory cells of serous tubules present secretory granules. Lm lamellae, BV blood vessel, ST secretory tubule, SD secretory duct, CT connective tissue, SC secretory cell, CC ciliated cell, L Lumen, C cilia, CmST caudal-most secretory tubules on papillary zone, SM secretory material, PP plateau projection, TG transverse groove, BP basal plate, S spinneret, SG secretory granules, SST serous secretory tubules, MST mucous secretory tubule

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