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Seminal plugs, which must be tightly adhered to the vaginal walls for optimal fertilization, are disturbed or loosened by copulatory intromissions. In multi-male mating encounters, a male may reduce the sperm delivered by a male by dislodging the former male's plug and depositing his own sperm and plug. Recent work has documented that the striated penile muscles are involved in the production of penile erectile cups and flips. This study focused on the effects of penile muscle excision on the ability of male rats to dislodge and deposit tight plugs.

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Using a radiopaque contrast medium to visualize if a seminal plug was tightly adhered to the vaginal wall, displaced caudally or dislodged, Experiment 1 examined the manner in which plugs were removed during a series of intromissions. The dislodgement process was envisioned as a gradual one beginning with caudal displacement which occurs during the first or second intromission.

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RSS Link Copy. Full text links Cite Display options Display options. Abstract Seminal plugs, which must be tightly adhered to the vaginal walls for optimal fertilization, are disturbed or loosened by copulatory intromissions. Similar articles Penile mechanisms and the role of the striated penile muscles in penile reflexes.

Hart BL, et al. Physiol Behav. PMID: Role of striated penile muscles in penile reflexes, copulation, and induction of pregnancy in the rat.

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Sachs BD. J Reprod Fertil. Role of testosterone secretion and penile reflexes in sexual behavior and sperm competition in male rats: a theoretical contribution.

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Hart BL. Copulation and ejaculation in male rats under sexual satiety and the Coolidge effect. Epub Apr Patterns of copulatory behavior in male mammals.

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Dewsbury DA. Q Rev Biol. PMID: Review. No abstract available. See all similar articles. Cited by 11 articles Copulatory plugs inhibit the reproductive success of rival males. Mangels R, et al. J Evol Biol. Epub Aug Genetic and phenotypic influences on copulatory plug survival in mice. Heredity Edinb. Epub Jun Nonmyocytic androgen receptor regulates the sexually dimorphic development of the embryonic bulbocavernosus muscle.

Ipulan LA, et al. Genetic disruption of the copulatory plug in mice le to severely reduced fertility. Dean MD. PLoS Genet.

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Epub Jan Turning sex inside-out: Peripheral contributions to sexual differentiation of the central nervous system. Swift-Gallant A, et al. Biol Sex Differ.

See all "Cited by" articles. Publication types Research Support, U. Gov't, P. MeSH terms Animals Actions. Ejaculation Actions. Female Actions.

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Male Actions. Rats Actions. Rats, Inbred Strains Actions. Vagina Actions. Full text links [x] Elsevier Science.