we just watched the episode where spock’s brain was stolen and then reimplanted by mccoy. Mccoy starts to falter, but luckily, Spock’s vocal chords are hooked up and so he is able to guide mccoy. The assistance he gives is priceless, as if there are only four nerve attachments that contol all the movement in the arm, wrist, and fingers.
All McCoy had to do was "fine tune" things.
But yes, the cranial nerves should have been completed, along with the motor neurons.
Except for some reason NOT distal nerves. I.e. "my right finger...excellent".
This is one episode that was IMHO ridiculous. Even in 1968, doctors knew anatomy.
They didn't need "the teacher" to tell them that.