Faculty Bibliography

Our objective was to document variations in the topography of pelvic floor nerves (PFN) and describe a nerve-free zone adjacent to the sacrospinous ligament (SSL). Pelvic floor dissections were performed on 15 female cadavers. The course of the PFN was described in relation to the ischial spine (IS) and the SSL. The pudendal nerve (PN) passed medial to the IS and posterior to the SSL at a mean distance of 0.6 cm (SD = +/-0.4) in 80% of cadavers. In 40% of cadavers, an inferior rectal nerve (IRN) variant pierced the SSL at a distance of 1.9 cm (SD = +/-0.7) medial to the IS. The levator ani nerve (LAN), coursed over the superior surface of the SSL-coccygeus muscle complex at a mean distance of 2.5 cm (SD = +/-0.7) medial to the IS. Anatomic variations were found which challenge the classic description of PFN. A nerve-free zone is situated in the medial third of the SSL.

BACKGROUND: Pessaries, properly maintained, have been shown to be safe for long-term care of symptomatic vaginal prolapse. Complications from neglected pessaries include impaction, erosion and fistula formation. Vesicovaginal fistulas have been described, but literature reports of rectovaginal fistulas are scarce. CASE: A 70-year-old woman, referred for pessary management, was found to have an impacted pessary that could not be removed due to pain. Examination under anesthesia revealed a Gellhorn pessary in the lumen of the rectum. It was removed transanally, leaving a large rectovaginal fistula. The patient was scheduled for reparative surgery in conjunction with colorectal surgery, but she cancelled the day before. CONCLUSION: For patients with a rectovaginal fistula resulting from an impacted vaginal pessary, a 2-stage procedure is required. The first stage, done under anesthesia, includes removal of the pessary and an examination to assess the size and location of the fistula. The second stage is operative management of the rectovaginal fistula, preceded by adequate bowel preparation. The clinician must stress proper pessary maintenance in order to avoid the serious consequences of a neglected pessary.

We described the innervation of the levator ani muscles (LAM) in human female cadavers. Detailed pelvic dissections of the pubococcygeus (PCM), iliococcygeus (ICM), and puborectalis muscles (PRM) were performed on 17 formaldehyde-fixed cadavers. The pudendal nerve and the sacral nerves entering the pelvis were traced thoroughly, and nerve branches innervating the LAM were documented. Histological analysis of nerve branches entering the LAM confirmed myelinated nerve tissue. LAM were innervated by the pudendal nerve branches, perineal nerve, and inferior rectal nerve (IRN) in 15 (88.2%) and 6 (35.3%) cadavers, respectively, and by the direct sacral nerves S3 and/or S4 in 12 cadavers (70.6%). A variant IRN, independent of the pudendal nerve, was found to innervate the LAM in seven (41.2%) cadavers. The PCM and the PRM were both primarily innervated by the pudendal nerve branches in 13 cadavers (76.5%) each. The ICM was primarily innervated by the direct sacral nerves S3 and/or S4 in 11 cadavers (64.7%).