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[The physiology of penile rigidity]
1Centre de Recherche sur les Dysfonctions Sexuelles, Clinique Saint-Maurice, Lyon.
Summary
Penile rigidity involves two phases: a vascular phase and a muscular phase. The muscular phase, driven by perineal muscle contractions, explains high intracavernous pressures beyond systolic blood pressure.
Area of Science:
- Physiology
- Urology
Context:
- Current understanding of penile tumescence and rigidity primarily attributes it to vascular mechanisms.
- Existing vascular theories do not fully explain the high intracavernous pressures observed during erection.
Purpose:
- To propose a dual-phase model for penile rigidity involving both vascular and muscular mechanisms.
- To explain the physiological basis for high intracavernous pressures exceeding systolic blood pressure.
Summary:
- Penile rigidity is explained by a two-phase model: an infrasystolic vascular phase and a suprasystolic muscular phase.
- The muscular phase, involving ischiocavernosus muscle contraction, allows intracavernous pressure to exceed systolic blood pressure significantly.
- Experimental data from animal and human studies support this hypothesis, linking perineal muscle activity to penile rigidity.
Impact:
- Challenges the purely vascular theory of penile erection.
- Provides a more comprehensive physiological explanation for erectile function.
- Highlights the role of muscular action in achieving and maintaining penile rigidity.