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Studies of bone from summer-active little brown bats, Myotis lucifugus lucifugus, have demonstrated sex differences in the renewal of skeletal mineral reserves following spring-arousal from hibernation. Patterns of bone remodeling in both sexes of bats indicate that new bone formation does not occur during hibernation: All new bone formation occurs during(More)
Morphological studies of thyroid C-cells and morphometric analyses of parathyroid glands in summer-active little brown bats indicated concomitant regulatory endocrine functions correlating with bone remodeling. C-cells apparently maintain maximal activity throughout the summer-active period in all bats. However, the hyperactivity of the parathyroid glands(More)
The annular hematoma of the shrew, Blarina brevicauda, is a specialized portion of the yolk-sac wall. In this study, we have examined the fine structure of the different cellular components of the anular hematoma. Small pieces of the gestation sacs from seven pregnant shrews were fixed in glutaraldehyde and osmium tetroxide and processed for transmission(More)
The structure and development of the female reproductive tract, fetal membranes and placental have not previously been recorded for any member of the family Thyropteridae. Recently implanted embryos were obtained in late January, limb-bud stages in March, and full-term fetuses in late May, suggesting a possible gestation length of approximately five months.(More)