Which of the following describes a lower motor neuron bladder?

A lower motor neuron bladder is characterized by the disruption of the neural pathways that facilitate the contraction of the detrusor muscle, which is responsible for bladder emptying. When there are lesions affecting the spinal nerves, this can lead to a reduced ability to contract the detrusor muscle, resulting in a flaccid bladder rather than an overactive one. In this state, the bladder may not able to empty properly, leading to urinary retention.

In contrast, descriptions involving cranial nerve lesions pertain more to upper motor neuron issues, where bladder function is often overactive rather than underactive. Hyperactive bladder contractions define conditions associated with upper motor neuron damage, while kidney failure is not directly tied to the classification of a lower motor neuron bladder but could involve complications from other underlying issues. Thus, the correct choice emphasizes the role of spinal nerve lesions in disrupting detrusor contraction, which is the hallmark of a lower motor neuron bladder.