1. THE PITUITARY GLAND
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Gonadotrops have been identified and described in many teleosts,
usually in relation to the sexual cycle. It is usually accepted that any
pars distalis basophils that are quiescent or absent before sexual
maturity, and which show pronounced secretory changes in correlation
with the gonadal cycle, are gonadotrops (e.g., eel, Figs. 17 and 18). A
complete summary of the many accounts of these cells in these terms
would be impossible, and the reader is referred to some of the more
detailed papers ( e.g., Scruggs, 1951; Olivereau, 1954; Sundararaj, 1959;
Olivereau and Ridgeway, 1962; Sokol, 1961; Schreibman, 1964; Lagios,
1965; Honma and Tamura, 1965a; Lehri, 1966; Rai, 1966a,b; yan Overbeeke and McBride, 1967) and to the review of Stahl (1963). In addition to these correlative studies, there are reports of characteristic changes
Fig. 17. Anguillu unguilh. Low power view of proximal pars distalis of an immature eel. Numerous growth hormone cells (pale). The darker cells along the blood
vessels and connective tissue are the poorly granulated immature gonadotrops. AF,
X430.