ⓘ Notch of Rivinus

                                     

ⓘ Notch of Rivinus

The Notch of Rivinus is a small defect in the posterior edge of the bony annular tympanic ring. The defect is located just superior to the tympano-mastoid suture line in the posterior ear canal. Following identification of the spine of Henle it is possible to follow the tympano-mastoid suture line medially towards the annular ring. At this location the Chorda Tympani Nerve is often identified. Just superior to this the Notch of Rivinus can be seen and the neck of the malleus occupies the notch and often is the superior limit of a tympanomeatal flap.

Etymology: August V. Rivinus, German anatomist, 1652-1723 flaw in the tympanic sulcus of the ear that forms an attachment for the flaccid part of the tympanic membrane and the mallear folds. Also called Rivinus incisure, tympanic incisure.

                                     
  • malleolar folds attached directly to the petrous bone at the notch of Rivinus On the inner surface of the tympanic membrane, the chorda tympani crosses this
  • this membrane is inserted. This ring of bone is incomplete at its upper part, forming a notch notch of Rivinus close to which are three small apertures:
  • above the lateral process of the malleus between the notch of Rivinus and the anterior and posterior malleal folds. Consisting of two layers and appearing