<prompt> Which of the following reflexes test the integrity of nucleus ambiguusJaw jerkStapedial reflexGag reflexCorneal reflex  <response>: Nucleus ambiguus involves cranial nerves 9th, 10th 11th . It involves the nerve supply to soft palate , larynx pharynx which is involved in speech swallowing. Gag reflex: Contraction of the constrictor muscle of the pharynx elicited by touching the back of the pharynx. 