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Qualitative and quantitative studies on the innervation of the corpus luteum of rat and pig

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Summary

Qualitative and quantitative studies were made to determine the amount of nerve fiber supplying corpora lutea (CL) of rats during the oestrous cycle and pregnancy and sow CL during days 4–6 after ovulation. Fluorescence microscopy of freeze-dried, paraformaldehyde treated (Falck-Hillarp method) rat ovaries reveals adrenergic nerve fibers which run along with vessels and form a network among interstitial gland cells. Nerve fibers do not enter the granulosa cell layer in follicles or CL. In the CL circumference both vascular and non-vascular nerves occur the latter being related to the fibromuscular layer and probably innervating smooth muscle cells. No striking differences exist between the innervation of the ovary in non-pregnant and pregnant rats. Bodian and methylene blue staining did not contribute to a more detailed knowledge of rat ovary nerve supply. Electron microscopic quantitative analysis of rat and pig CL (rat: day 18 of pregnancy; pig: day 4–6 after ovulation) revealed no axon profiles in 2.000 grid squares (one square measuring 2.25×10-2 mm2) of randomly taken CL sections. Thus it was possible to calculate an upper limit of 133 μm of nerve fibers per 1 mm3 CL tissue, in case there were any at all.

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  1. Department of Anatomy, University of Kiel, Kiel, Germany

    K. Unsicker

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  1. K. Unsicker
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Supported by a grant from the „Deutsche Forschungsgemeinschaft” (Un 34/1).

I am much obliged to Mrs. K. Jacob, Mrs. A. Löwe, and Mrs. R. Sprang for valuable technical assistance.

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Unsicker, K. Qualitative and quantitative studies on the innervation of the corpus luteum of rat and pig. Cell Tissue Res. 152, 513–523 (1974). https://doi.org/10.1007/BF00218935

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  • DOI: https://doi.org/10.1007/BF00218935

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