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The tympanic annulus is formed by a fibrocartilaginous thickening of the edge of the pars tensa and has a horseshoe-shaped configuration. It is deficient superiorly at the notch of Rivinus, where the pars flaccida is found 1. The tympanic annulus inserts into the tympanic sulcus, a shallow groove of the external acoustic canal (EAC), attaching the tympanic membrane to the EAC. The annulus has a triangular cross-section with the base inserted into the sulcus and the apex pointing towards the tympanic membrane 3.
History and etymology
The notch of Rivinus was first described by Augustus Quirinus Rivinus (1652–1723), a German anatomist 2.
- 1. Kassem F, Ophir D, Bernheim J, Berger G. Morphology of the human tympanic membrane annulus. (2010) Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery. 142 (5): 682-7. doi:10.1016/j.otohns.2010.01.020 - Pubmed
- 2. Mosby. Mosby's Medical Dictionary. ISBN: 9780323414258
- 3. Salah Mansour, Jacques Magnan, Hassan Haidar, Karen Nicolas, Stéphane Louryan. Comprehensive and Clinical Anatomy of the Middle Ear. ISBN: 9783642369674