What type of innervation does the detrusor muscle receive from the pelvic nerve?

The detrusor muscle, which is situated in the bladder wall, predominantly receives parasympathetic innervation from the pelvic nerve. This is essential for bladder function, particularly in facilitating the process of micturition, or urination. When activated by parasympathetic signals, the detrusor muscle contracts, allowing for the expulsion of urine from the bladder. This contraction is critical for the normal physiological process of urination.

The pelvic nerve is responsible for providing the necessary stimuli that enhance detrusor muscle activity during the filling and voiding phases of the bladder cycle. This parasympathetic control is vital for allowing the bladder to fill gracefully and then contract effectively when it is time to urinate.

In contrast, sympathetic innervation typically works to relax the detrusor muscle and contract the internal urethral sphincter, which is not conducive to urination. Somatic innervation, on the other hand, is involved with the external urethral sphincter control, allowing for voluntary control over urination. Inhibitory innervation does not directly classify into the autonomic nervous system spectrum in this context; instead, it usually refers to influences that decrease muscle activity rather than maintaining the contraction needed during urination