Cyclic changes in the pituitary gland in correlation with the testicular cycle in a hill-stream teleost, Schizothorax richardsonii (Gray and Hard).
In Schizothorax richardsonii, the pituitary gland has been studied in correlation with the phases of the testicular cycle. The cyanophils of the proximal pars distalis show hypertrophy, hyperplasia, granulation, degranulation and vacuolisation in concurrence with the spermatogenic cycle. Secretory activity of the cyanophils controls the maturation of testes, which indicates that these cyanophils are gonadotrops. The formation of sperm mother cells, however, does not appear to depend on the secretory activity of the pituitary. During spawning and regression phases, the azocarminophilous granules in the cytoplasm of the cyanophils show quantitative variation. The migratory chromophil cells show numerical variation, suggesting their involvement in the reproductive cycle. Neurosecretory material also appears to play some part in reproduction.
D000818:Animals; D005399:Fishes / Q000033:anatomy & histology*; D008297:Male; D010902:Pituitary Gland / Q000166:cytology* / Q000502:physiology; D013091:Spermatogenesis; D013737:Testis / Q000166:cytology* / Q000502:physiology; D013997:Time Factors