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Ultrastructure of pig pinealocytes in various stages of the sexual cycle: a quantitative study
B Przybylska1, Z Wyrzykowski, K Wyrzykowska
1Department of Histology and Embryology, Agricultural and Technical Academy, Olsztyn, Poland.
Abstract:
Relative volumes of mitochondria (MIT), lysosomes (LYS), Golgi profiles (GP), granular endoplasmic reticulum (GER), membrane bound bodies of type 1 (MBB 1) and type 2 (MBB 2), and the number of dense-core vesicles (DCV), were counted in pinealocytes of female sexually immature pigs, in animals in oestrus and in nursing pigs. Relative volumes of GER, LYS, MBB I and the number of DCV changed in the different stages of the sexual cycle. The highest volumes of GER, LYS and MBB 1 were observed in pigs in oestrus. Pinealocytes of sexually immature pigs were characterized by a considerably higher number of DCV in comparison with mature animals.