36
J. N. BALL AND BRIDGET I. BAKER
Fig. 18. Anguillu anguillu. Low power view of proximal pars distalis of a mature
female eel (cf. Fig. 16). Contrast with Fig. 17 and note that the gonadotrops are
now greatly enlarged and filled with a dense AF + ve granulation. The growth hormone cells seem less numerous. AF, X430. For details, see Olivereau (1967a).
(resembling those seen in mammals, Purves, 1966) in teleost gonadotrops
following surgical gonadectomy ( Sokol, 1955; Schreibman, 1964) or
administration of gonadal steroids (Geske, 1956).
The Gonudotrops of Poecilia ktipinna. Like many cyprinodonts, the
molly is viviparous, with approximately monthly cycles of gestation,
parturition, and oocyte growth, and the young fish quickly reach sexual
maturity, in a matter of a few months in males reared in good conditions.
These facts make it an interesting species for studies on the gonadotrops.
These cells were initially identified by comparing the pituitary in immature and mature fish. In the immature state, the proximal pars distalis
contains only two chromophilic cell types, LY cells and TSH cells, the latter
J. N. BALL AND BRIDGET I. BAKER
Fig. 18. Anguillu anguillu. Low power view of proximal pars distalis of a mature
female eel (cf. Fig. 16). Contrast with Fig. 17 and note that the gonadotrops are
now greatly enlarged and filled with a dense AF + ve granulation. The growth hormone cells seem less numerous. AF, X430. For details, see Olivereau (1967a).
(resembling those seen in mammals, Purves, 1966) in teleost gonadotrops
following surgical gonadectomy ( Sokol, 1955; Schreibman, 1964) or
administration of gonadal steroids (Geske, 1956).
The Gonudotrops of Poecilia ktipinna. Like many cyprinodonts, the
molly is viviparous, with approximately monthly cycles of gestation,
parturition, and oocyte growth, and the young fish quickly reach sexual
maturity, in a matter of a few months in males reared in good conditions.
These facts make it an interesting species for studies on the gonadotrops.
These cells were initially identified by comparing the pituitary in immature and mature fish. In the immature state, the proximal pars distalis
contains only two chromophilic cell types, LY cells and TSH cells, the latter