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Ultrastructural and morphometric study of the sertoli cell of the viscacha (Lagostomus maximus maximus) during the annual reproductive cycle
Changes in the morphology of viscacha Sertoli cells were studied during the annual reproductive cycle. Sertoli cells exhibited marked nuclear and cytoplasmic changes. Seasonal variation in nuclearExpand
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Morphological and Endocrine Study of the Ovarian Interstitial Tissue of Viscacha (Lagostomus maximus maximus)
The morphological and endocrine aspects of the ovarian interstitial tissue of adult female viscachas were investigated to establish the probable function and the biological significance of thisExpand
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MICROTUBULES IN THE NERVE FIBERS OF THE TOAD BUFO ARENARUM HENSEL
Recen t studies on cytoplasmic microtubules have provided evidence for regarding t hem as gel components susceptible to solational weakenings. Micro tubule s tructure in various cell types has beenExpand
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Seasonal changes of the Leydig cells of viscacha (Lagostomus maximus maximus). A light and electron microscopy study.
The Leydig cells of viscacha (seasonal rodent) show cytoplasmic hypertrophy and regional distribution during the breeding period (summer-autumn). The dominant organelles are smooth endoplasmicExpand
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Probable effect of photoperiod on seasonal variation in the nuclear volume of the adrenal cortex of viscacha (Lagostomus maximus maximus).
The neuroendocrine system regulates several organic functions such as reproduction, metabolism and adaptation to the environment. This system shows seasonal changes linked to the environment. TheExpand
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Seasonal Morphological Variations and Age‐Related Changes of the Seminal Vesicle of Viscacha (Lagostomus maximus maximus): An Ultrastructural and Immunohistochemical Study
The viscacha is a seasonal rodent that exhibit an annual reproductive cycle with periods of maximum reproductive activity and gonadal regression. We studied seasonal variations in the morphology andExpand
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The toad adrenal gland. I. Cortical cells during summer and winter.
Abstract In this work we describe the seasonal changes occurring in the adreno-cortical cells of the toad Bufo arenarum Hensel. In summer, the gland presents wider cellular cords characterized byExpand
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A Light and Electron Microscopic Study of the Pineal Gland of the Viscacha (Lagostomus maximus maximus)
The pineal of viscacha (Lagostomus maximus maximus) is formed by two main cellular populations of pinealocytes and interstitial cells. A connective capsule surrounds the gland sending numerous septaExpand
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Epididymis of viscacha (Lagostomus maximus maximus): morphological changes during the annual reproductive cycle.
Little is known about morphological changes in the epididymis in relation to the natural photoperiod or their influence on sperm maturation. The viscacha is a seasonal rodent living in the SouthernExpand
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Colloid in the pituitary pars distalis of viscacha (Lagostomus maximus maximus): Ultrastructure and occurrence in relation to season, sex, and growth
Randomly distributed extracellular colloidal accumulations were observed in the pars distalis of viscacha (Lagostomus maximus maximus). They were preferentially located in the peripheral zone of theExpand
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