Читать книгу Bovine Reproduction - Группа авторов - Страница 235

Ventral deviation of the penis is less common than spiral deviation and the etiology is uncertain. The penis assumes a ventral curvature as erection progresses and has been described as a “rainbow” due to the arc formed by the erect penis. Like spiral deviation, ventral deviation is best diagnosed with an observed test mating, but observation under stimulation with an electroejaculator is useful because, unlike spiral deviation, ventral deviation is not a normal phenomenon. The area of ventral deviation usually originates in the shaft of the penis proximal to the origin of the dorsal apical ligament (Figure 15.15), meaning that surgical correction of ventral deviation with techniques to supplement the ligament are unlikely to be successful. The occasional reports of successful correction by pexy of the dorsal apical ligament are limited to cases in which the deviation is restricted to the free portion of the penis [32] (Figure 15.16).

Figure 15.15 Ventral deviation of the penis demonstrated during stimulation with an electroejaculator. Note that the deviation begins proximal to the origin of the dorsal apical ligament of the penis. Surgical repair has been unsuccessful in such cases.

Source: Courtesy of Robert L. Carson and Dwight Wolfe.

Figure 15.16 Ventral deviation of the penis demonstrated during a test mating. Note that in this case the deviation begins distal to the origin of the dorsal apical ligament of the penis. Surgical supplementation of the dorsal apical ligament may be attempted in these cases.

Source: Courtesy of Richard Hopper.