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Three-dimensional model of corpus cavernosum. (a) Erectile tissue is represented by N straight elastic rods connecting the interior walls in random fashion. (b) Force analysis on a rod: F, stretching force on rod; A, rod cross-sectional area; ϕ, angle of rod with respect to a horizontal plane; θ, angle with respect to a vertical plane. (c) Projection of a rod on a plane perpendicular to the cylindrical axis.
