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Fig. 3 | Helgoland Marine Research

Fig. 3

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

Fig. 3

Sagittal sections of the oviducal gland (OG) of Raja clavata, at the different stages of development. a Undifferentiated OG in an immature female. H&E. b Beginning of the development of the OG in an early developing female. H&E. c Formation of lamellae, gland tubules and differentiation of the four distinct zones in a developing female. H&E. d Fully developed OG with full differentiation of the four secretory zones in a spawning capable female. PAS/AB. CT connective tissue, L lumen, Lm lamellae, Cz club zone, Pz papillary zone, Bz baffle zone, Tz terminal zone

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