Final answer:
The procedure called Electromyography (EMG) measures muscle contraction that controls urination using electrodes placed in the rectum and urethra. It is used to assess the function of nerves controlling the detrusor muscle and external urethral sphincter during micturition.
Step-by-step explanation:
The procedure that measures the contraction of muscles which control urination using electrodes placed in the rectum and urethra is known as urodynamics. Specifically, this includes electromyography (EMG), which is used to record the electrical activity produced by the skeletal (voluntary) muscles that control the external urethral sphincter. The correct answer to the question is Electromyography (3), as myorrhaphy is surgical suturing of a muscle, electromyorrhaphy is not commonly used or recognized term, urethrography is an imaging study of the urethra, and urethromyography is not the correct term for this measurement. Electromyography helps assess the function of the nerve fibers that control the muscles during the micturition reflex. This test is especially relevant considering that the detrusor muscle and external urethral sphincter work in coordination to allow urine to exit the body, and this coordination is controlled by the autonomic and somatic nervous systems.