Final answer:
The part of the spine that controls the bladder is the sacral micturition center, which is a group of neurons located in the sacral region of the spinal cord.
Step-by-step explanation:
The part of the spine that controls the bladder is the sacral micturition center, which is a group of neurons located in the sacral region of the spinal cord.
It acts reflexively to control urination, but its action can be modified by higher brain centers to allow voluntary urination. The sacral micturition center sends nerve impulses to the bladder wall, causing the detrusor muscle to contract and the internal urethral sphincter to relax during urination.