Fifty rabbits received injections of Indian ink into the facial nerve trunk at the stylomastoid foramen. Observation of the serial sections of their temporal bones, revealed that ten cases of them manifested varied Indian ink infiltration into the subarachnoid space, along the facial, nerve, the auricular branch of the vagus nerve the tympanic nerve. Indian ink infiltrated fuom the subarachnoid space to the tensor palati muscle via the tensor palati nerve and to the tensor tympani muscle via the tensor palati nerve. These routes are suspected to be a course of spreading infection.
