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  • 1
    Electronic Resource
    Electronic Resource
    Dorsal rhizotomy does not alter rat estrous cycles or ovarian compensatory responses (1993)
    Springer
    Anatomy and embryology 187 (1993), S. 461-464 
    Details
    ISSN: 1432-0568
    Keywords: Ovary ; Ovarian sensory nerves ; Unilateral ovariectomy ; Compensatory ovarian hypertrophy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Rats were subjected to right side dorsal rhizotomy of spinal nerves T12-L2 and ipsior contralateral unilateral ovariectomy at estrus (day 1). Estrous cycles were recorded daily, and on day 15 the remaining ovary was removed and weighed. Antral follicles were counted in representative day 1 and day 15 ovaries. Dorsal rhizotomy did not affect estrous cycles during the period after surgery. Also dorsal rhizotomy did not alter ipsilateral ovarian hypertrophy or follicular activation following unilateral ovariectomy. Thus, although the major portion of the ovarian sensory innervation is via the lesioned segments, interruption of these segments centrally does not alter compensatory ovarian responses subsequent to unilateral ovariectomy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00174421
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ovarian sympathectomy in the guinea pig (1984)
    Springer
    Cell & tissue research 236 (1984), S. 257-263 
    Details
    ISSN: 1432-0878
    Keywords: Ovary ; Adrenergic nerves ; Follicle growth ; Guinea pig
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The influence of ovarian adrenergic nerves on follicular growth during the estrous cycle in the adult guinea pig was ascertained by comparing follicular development in control and chemically sympathectomized ovaries from the same animal. Selective ovarian sympathectomy was achieved by injecting 6-hydroxydopamine into a surgically closed periovarian membranous sac (bursa) on day 2 of the cycle (day 1 = day of estrus). The contralateral surgically closed ovarian bursa was injected with solvent used for 6-hydroxydopamine. Animals were laparotomized on days 5, 10 and 14 of the cycle. Blood from the utero-ovarian vein was collected bilaterally for measurement of progesterone and androstenedione. The ovaries were processed for histologic examination, and the number of follicles in each ovary was analyzed morphometrically. Sympathectomy on day 2 caused a decrease in healthy preovulatory follicles (〉 700 μm diameter) on day 10 of the cycle. There were no differences in ovarian weights or the total number of follicles per ovary at this time. On days 5 and 14 of the cycle, there were no differences in ovarian weights, total number of follicles per ovary or follicles in any size classification. Sympathectomy did not alter progesterone levels in the uteroovarian vein as compared to contralateral control levels. From control ovaries, there was a significant increase in progesterone in the blood of the utero-ovarian vein on day 10 but venous levels of progesterone from sympathectomized ovaries were not significantly different at any day of the cycle. In the venous effluent from sympathectomized ovaries, androstenedione was elevated at day 5 compared to days 10 and 14. These observations suggest that ovarian adrenergic nerves may modulate growth of large antral follicles and ovarian steroidogenesis during the estrous cycle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00214226
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ovarian sympathectomy in the guinea pig (1984)
    Springer
    Cell & tissue research 236 (1984), S. 593-596 
    Details
    ISSN: 1432-0878
    Keywords: Ovary ; Adrenergic nerves ; Follicle growth ; Guinea pig
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The role of ovarian adrenergic nerves in follicular growth was studied in prepubertal guinea pigs by determining the effect of sympathectomy on 1) follicle populations and 2) follicular development following exogenous gonadotropin administration. Selective unilateral ovarian sympathectomy was achieved by injecting 6-hydroxydopamine into a surgically closed periovarian bursa on day 20 postpartum. The contralateral surgically closed ovarian bursa was injected with the vehicle used for 6-hydroxydopamine. On day 25, animals were injected with pregnant mare serum or saline followed by human chorionic gonadotropin or saline 48 h later. All animals were laparotomized on day 28 and blood from utero-ovarian veins was collected bilaterally for androstenedione determination. Ovaries were processed for morphometric analysis of follicles. The sympathectomized ovary in saline-injected animals had a significant decrease in preantral follicles (characterized by ≤2 layers of granulosa cells without antrum formation), an increase in 310–500 μm diameter atretic follicles and an increase in follicles ≥700 um compared to the contralateral control ovary. There were no differences in androstenedione levels from the two sides, ovarian weights or the total number of follicles per ovary. Neither ovary had corpora lutea. The sympathectomized ovary in animals injected with gonadotropins was not different from the contralateral ovary in any of the parameters measured. Both control and sympathectomized ovaries had newly formed corpora lutea in response to the exogenous gonadotropins. These results suggest that ovarian adrenergic nerves normally participate in follicular development in the prepubertal guinea pig. However, exogenous gonadotropins may override neural influences on the prepubertal ovary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00217227
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Cellular junctions in perifollicular contractile tissue of the rat ovary during the preovulatory period (1981)
    Springer
    Cell & tissue research 219 (1981), S. 133-141 
    Details
    ISSN: 1432-0878
    Keywords: Ovary (rat) ; Intermediate junctions ; Gap junctions ; Theca externa ; Ovulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Rat ovarian perifollicular contractile tissue was examined at specified intervals prior to ovulation to determine the type, relative number, and length of cellular junctions. Rat ovaries were taken for electron-microscopic observation at 1500 h on the afternoon of proestrus (proestrus 0-h group), at 2000 h (proestrus 5 h group), at 0100 h (proestrus 10-h group) and at 1600 h on the afternoon of diestrus I. Close junctions, intermediate junctions, and gap junctions were counted and measured. The number of gap junctions 1,000 μm of membrane and the number of intermediate junctions 1,000 μm of membrane was significantly higher in the proestrus 10 h group as compared to the other groups. There was no difference in the number of close junctions during the periods studied. Also the length of all junctions was similar in all groups. These morphological findings are discussed in the context of a contractile role for perifollicular tissue in the ovulatory process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00210023
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    Paper (German National Licenses)
    Fulltext
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