Fig. 7

Histological investigation of oviducal glands. A, B Sagittal sections stained with AB/PAS (A) and HE (B). CZ, club zone; BZ, baffle zone; TZ, terminal zone; P, plateaus. C, D Magnified view of baffle plates (BP) and plateaus (P) of the section in (B). E to N Posterior portion of the baffle zone (E, G, I, K, M) and magnified views of secretory tubules (F, H, J, L, N). E, F Vehicle treatment for 2 days. (G, H) P4 administration for 1 day using 8 cm tubing. (I, J) P4 administration for 2 days using 8 cm tubing. (K, L) P4 administration for 5 days using 8 cm tubing. M, N The individual having the capsulated eggs in the oviducts, which probably represents the third day of P4 surge. Square frames with solid line represent the magnified areas in (F, H, J, L, N). The areas of tendril components (*) and secretory tubules in the square frames with dotted line were measured in Fig. 8. Arrows indicate tendrils. Scale bars,1 mm (A, B), 200 µm (C), 100 µm (D), 500 µm (E, G, I, K, M), and 50 µm (F, H, J, L, N)