A section of the mastoid process shows it to be hollowed out into a number of spaces, the mastoid cells, which exhibit the greatest possible variety as to their size and number.

It is called the tympanic antrum, and must be distinguished from the mastoid cells, though it communicates with them.

Like the mastoid cells it is filled with air and lined by a prolongation of the mucous membrane of the tympanic cavity, with which it communicates.

He showed the connection between the mastoid cells and the tympanic cavity, and made observations on physiologic and pathologic processes of the ear.

He was the first to point out the connection between the mastoid cells and the middle ear.

Schuller's view is a lateral radiographic view of skull principally used for viewing mastoid cells.

A section of the mastoid process of the temporal bone of the cranium shows it to be hollowed out into a number of spaces, the mastoid cells, which exhibit great variety in their size and number.

Pneumatic spaces include the paranasal sinuses and some of the mastoid cells.

The posterior branch also supplies the mucous lining of the mastoid cells.

Schwartze's operation-the opening of the mastoid cells with a hammer and chisel in disease of the middle ear.