from The Century Dictionary and Cyclopedia
- Relating to the drum of the ear and the mastoid cells.
Sorry, no etymologies found.
The nerve reaches the surface by passing through the tympanomastoid fissure between the mastoid process and the tympanic part of the temporal bone, and divides into two branches: one joins the posterior auricular nerve, the other is distributed to the skin of the back of the auricula and to the posterior part of the external acoustic meatus.
Posteriorly, it blends with the squama and mastoid part, and forms the anterior boundary of the tympanomastoid fissure.
Lateral to the stylomastoid foramen, between the tympanic part and the mastoid process, is the tympanomastoid fissure, for the auricular branch of the vagus.