Fig. 7
From: The development of the oviducal gland in the Rajid thornback ray, Raja clavata
Secretory material accumulated in the tubules lumen of spawning capable females. a Papillary zone containing PAS+ secretory material. PAS/AB. b Baffle zone tubular glands containing egg capsule material. H&E. c Baffle zone secretory ducts secreting the egg capsule material to the gland lumen. H&E. d Terminal zone secretory ducts secreting the surface hairs to the gland lumen. H&E. ST secretory tubule, SM secretory material, L Lumen, SD secretory duct, CT connective tissue, EC egg capsule, PP plateau projection, BP basal plate, SH surface hair