Final answer:
The dorsal motor nucleus of X, also known as the nucleus ambiguus, is responsible for controlling the motor function of the organs in the neck and chest.
Step-by-step explanation:
The dorsal motor nucleus of X, also known as the nucleus ambiguus, is located adjacent and lateral to the hypoglossal nucleus. It is responsible for controlling the motor function of the organs in the neck and chest, such as the heart, lungs, and esophagus. This nucleus receives input from higher brain centers and helps regulate various autonomic functions.