Vagal nuclei was a hated subject to me..so bad that I would turn the page if I ever came across it.
This thing helps keep my facts straight when it comes to these horrid nuclei.. hopefully it will help you too.
Ambiguous in a literal meaning is to outshine everyone else. There are many ways to do that. The most everlasting impression you leave is how you interact to people..what to say and when to say.
That's what nucleus ambiguous helps you to achieve..these are the neurons controlling the palate, pharynx and larynx. Hence, the controller of speech :)
its the vagus, the glossopharyngeal and spinal accessory that share this nucleus
Nucleus Solitarius is for taste sensation and for the supply of carotid and aortic body chemoreceptos
Hence, it's the facial, glossopharyngeal and vagus nerve that share this particular nucleus
Psst- let me know of your way to remember this. Our ideas may be solitary..but let's make it ambiguous together :D