Figure 31

Figure 31 Histological section of the spinal cord at the level of the S2 segment shows selective degeneration of Onuf' s nucleus (arrowed), which contains the cell bodies of the pudendal nerve, responsible for innervating the pelvic floor, a feature of multiple system atrophy (formerly known as Shy-Drager syndrome). Men who have this disorder often present with erectile dysfunction and incontinence