Mastoid air cells. Cellulae mastoideae. Like the tympanic cavity, they are lined by squamous and/or cuboidal epithelium. D Tympanic cells. Cellulae tympanicae. Small cell-like depressions in the floor of the tympanic cavity. D
Carotid wall. Paries caroticus. Anterior wall formed partly by the carotid canal, partly by the opening of the auditory tube. D Membranous wall. Paries membranaceus. Lateral wall of tympanic cavity formed primarily by the tympanic membrane. B Tympanic membrane (eardrum). Membrana tympanica. Obliquely oriented membrane at the end of the external acoustic meatus. Diameter: 9-11 mm. A B
Pars flaccida [[Shrapnell's membrane]]. Smaller, more flaccid part of tympanic membrane located above the anterior and posterior mallear folds. A B
Pars tensa. By far, the largest part of the tympanic membrane, situated within the tympanic ring. A B
Anterior malleolar fold (6). Plica mallearis anterior. Fold on the inner surface of the tympanic membrane. It has a concave lower edge and extends anteriorly from the base of the manubrium of the malleus. B Posterior malleolar fold (6). Plica mallearis posterior. Fold on the inner surface of the tympanic membrane. It has a concave lower edge and extends posteriorly from the root of the manubrium of the malleus. B Mallear prominence. Prominentia mallearis. Small elevation on the outside of the tympanic membrane caused by the lateral process of the maleus. A
Stria mallearis. A bright band that appears on the outer surface of the tympanic membrane due to the underlying manubrium of the malleus, which is fused with the tympanic membrane. A
Umbo of tympanic membrane. Umbo mem-branae tympani. Structure at the tip of the man-ubrium of the malleus, where the tympanic membrane is drawn inward. A Cutaneous layer. Stratum cutaneum. The layer ofstratified squamous epithelium on the external surface of the tympanic membrane. C Fibrocartilaginous ring. Anulus fibrocar-tilagineus. Attaches the tympanic membrane in the tympanic sulcus. C
Radiate layer. Stratum radiatum. Outer group of radially oriented fibers of the tympanic membrane. C
Circular layer. Stratum circulare. Inner group of circularly oriented fibers of the tympanic membrane. C
Mucosal layer. Stratum mucosum. Layer of simple squamous epithelium covering the inner surface of the tympanic membrane. C
Was this article helpful?
This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.