A quantitative study of pituitary colloid in the bat Myotis lucifugus lucifugus in relation to age, sex, and season

The American Journal of Anatomy
E L Anthony, A W Gustafson

Abstract

Extracellular colloid accumulations were examined in pituitary glands of adult and juvenile, male and female, little brown bats, Myotis lucifugus lucifugus (Chiroptera: Vespertilionidae), collected at various times during the annual reproductive cycle. Round or ovoid periodic acid-Schiff-reactive accumulations of colloid were scattered throughout the pars distalis, pars intermedia, and pars tuberalis. These accumulations were surrounded by processes of agranular "follicular" cells. The proportion of the volume of the pars distalis occupied by colloid (volume fraction) exhibited considerable variation among animals, ranging from 0.00 to 3.18% in the total sample of bats. Pituitaries of juvenile males, yearling males, and nonparous females contained significantly less colloid than those of parous females and adult males. The mean volume fraction for each of these groups suggested that colloid content increased progressively from birth through sexual maturity in this animal. In addition, the frequency distribution of colloid content measurements made in parous females and adult males provided indirect evidence that colloid continues to accumulate throughout life. No sexual dimorphism in colloid content was observed before or after...Continue Reading

References

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Citations

Oct 27, 2007·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Kristy L TownsendE P Widmaier
Sep 25, 1999·Archives of Histology and Cytology·K InoueS Ogawa
Jul 8, 2003·The Anatomical Record. Part A, Discoveries in Molecular, Cellular, and Evolutionary Biology·Giacomo AzzaliGiuseppina Romita
Jan 23, 2016·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Kunwar P BhatnagarHeiko D Frahm

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