TABLE 51 8 Abnormalities of the Eardrum

Normal Eardrum

This normal right eardrum (tympanic membrane) is pinkish gray. The handle of the malleus lies in a somewhat oblique position behind the upper part of the drum. The short process of the malleus pushes the membrane laterally, creating a small white elevation. Above the short process lies a small portion of the eardrum called the pars flaccida. The remainder of the drum is the pars tensa. Anterior and posterior malleolar folds, which extend obliquely upward from the short process, separate the pars flaccida from the pars tensa, but they are often invisible unless the eardrum is retracted. From the umbo the bright cone oflight fans anteriorly and downward. Other light reflections seen in this photo are artifactual. Posterior to the malleus, part of the incus is visible behind the drum. The small blood vessels that course along the handle of the malleus are within the range of normal and do not indicate inflammation. The ear canal, which surrounds the eardrum, looks flatter than it really is because of distortion inherent in the photographic technique.

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