**1.3 Sacral-infrasacral lesions**

Lesions in this site will have predominantly voiding symptoms related to a hypocontractile (if incomplete lesion is present) or acontractile detrusor (complete lesion). The clinical presentation is due to injury to the parasympathetic motor nuclei that innervates the detrusor muscle. Stress urinary incontinence is usually related to Onuf's nucleus injury and pudendal nerve dysfunction over the striated sphincter (**Figure 1**).
