![]() The inner, medial surface is convexed towards the middle ear and connects with the malleus bone of the middle ear. It has a more flaccid part (pars flaccida), and a more taut part (pars tensa). ![]() It is composed of a membrane attached by fibrous cartilage to the surrounding bone. Tympanic membrane (eardrum): This portion represents the border between the external and middle ear.The inner portion-representing about two-thirds of its course-is surrounded by temporal bone and terminates at the tympanic membrane. This portion curves, slightly up and to the back, before bending forward and down. Its outer portion is surrounded by cartilage, and the inner part is surrounded by bones of the skull. ![]()
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