The main organs involved in urination are the urinary bladder and the smooth muscle of the bladder, known as the detrusor, is innervated by sympathetic nervous system fibers from the lumbar spinal cord and parasympathetic fibers from the sacral spinal cord.
The main organs involved in urination are the urinary bladder. The smooth muscle of the bladder is innervated by sympathetic nervous system fibers from the lumbar spinal cord from the sacral spinal cord. The smooth muscle of the bladder is innervated by sympathetic nervous system fibers from parasympathetic fibers from the sacral spinal cord. The smooth muscle of the bladder is known as the detrusor.