There is an experiment in Russia that has been breeding foxes for over 50 years now. The goal is to understand how domestication changes an the physiology of an animal. They breed the foxes that show the most tame and docile behaviors towards humans in an effort to recreate the process of changing wolves to dogs.
On the flip side, they also breed the foxes that are most aggressive and hostile towards people. One day they will get too powerful and get loose…
The book Johnny Got His Gun kind of answers this question. In the book, a WWI soldier gets blown up by an artillery shell and wakes up in a hospital missing most of his body. He has lost his arms, legs, nose, mouth, eyes, and ears.
In the end he learns he can communicate with a nurse by tapping his head in Morse code. So it would seem as long as you could move you head with your neck, you can still communicate with others.