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Libelle of note

For the Reticulospinal tracts various terms are used in the literature. Following the study on human reticulospinal fibres by Nathan PW, Smith MC, Deacon P (1996 Vestibulospinal, reticulospinal and descending propriospinal nerve fibres in man. Brain 119:1809-1833), here, a simplified subdivision into a Lateral (from The Myelencephalon) and a Medial reticulospinal tract (from the Pons) is advocated.

The promontorium gives rise to several bony ridges: (a) the ponticulus promontorii; (b) the subiculum promontorii; and (c) the finiculus.

In the retrotympanum, lateral and medial spaces relative to the facial nerve and pyramidal eminences were defined: lateral, the sinus facialis and the sinus tympanicus lateralis; medial, the sinus tympanicus posterior and the sinus tympanicus.

The paries mastoideus shows three bony eminences, each giving rise to a ridge: (a) the eminentia pyramidalis; (b) the eminentia chordae tympani; and (c) the eminentia styloidea.

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New term; the Corpus adiposum tubae auditivae (of Ostmann) is a triangular fat pad mediocaudal to the Tuba auditiva and laterocranial to the Musculus tensor veli palatini. It is thought to be important in normal closure of the tube, preventing transmission of nasopharyngeal pressure in the middle ear cavity.

In ENT Surgery, the Macula cribrosa superior is known as 'Mike's dot' (after Michael E. Glasscock). It is an important landmark for translabyrinthine resection of an acoustic neurinoma.

The clinical term cog refers to a coronally oriented osseous ridge protruding in the middle ear cavity, for which the term processus inferior tegminis was introduced (Lang J 1992 Klinische Anatomie des Ohres. Springer, Wien – New York).

New term; the isthmus meatus acustici externi is the narrowest part of the External acoustic meatus, located at the junction of the meatus acusticus externus cartilagineus and the bony part.

For the paries auris mediae, several new terms have been added giving credit to clinical findings (from Mansour S. Magnan J, Ahmad Hh, Nicolas K, Louryan S 2019 Comprehensive and Clinical Anatomy of the Middle Ear, 2nd ed. Springer, Cham).

New term; the Ponticulus promontorii is a thin bony bridge from the Eminentia pyramidalis to the Promontorium (from Lang J 1992 Klinische Anatomie des Ohres. Springer, Wien - New York).

The chorda tympani passes from the facial canal through the posterior tympanic canaliculus to enter the tympanic cavity via the apertura tympanica canaliculi chordae tympani posterioris; via the apertura tympanica canaliculi chordae tympani anterioris, the chorda tympani enters the anterior tympanic canaliculus (see also TA98, A02.1.06.011 canaliculus chordae tympani)

The Processus spatuliformis is a circular (spatulate) process at the end of the Handle, with a ligamentous attachment to the Pars tensa at this point.

The diaphragma epitympanicum (epitympanic diaphragm) separates the epitympanum from the mesotympanum. The diaphragm is formed by the lateral incudomallear and mallear folds laterally, and the tensor tympani fold anteriorly. The epitympanum and the mesotympanum communicate through two openings in the diaphragm, known as the isthmus anterior and isthmus posterior.

The corpus adiposum tubae auditivae (of Ostmann) is a triangular fat pad mediocaudal to the tuba auditiva and laterocranial to the musculus tensor veli palatini. It is thought to be important in normal closure of the tube, preventing transmission of nasopharyngeal pressure in the middle ear cavity.

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The cell types of the Organum spirale have been rearranged as Epitheliocyti limitantes (Border cells), Epitheliocyti sustenantes (Supporting cells) and Cochleocyti (Hair cells). Inner and outer sulcus cells have been added to the border cells (Fritzsch B, Elliott KL 2018 Auditory nomenclature: Combining name recognition with anatomical description. Front Neuroanat 12:99).

The German “Pfeilerzelle” was correctly translated into US English as “pillar cell”, but in UK English as “pilar cell”(Fritzsch B, Elliott KL 2018 Auditory nomenclature: Combining name recognition with anatomical description. Front Neuroanat 12:98).

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The clinical term retrotympanum has been added for the posterior part of the mesotympanum.

The promontorium shows a bony overhang over the cochlear or round window, comprising a postis anterior (anterior pillar), a roof (tegmen) and a postis posterior (posterior pillar) as described by Bolobas B (1972 A hallószery mikrochirurgial anatomija. Könykiadó, Budapest (in Hungarian); Proctor B, Bolobas B, Niparko JK 1986 Anatomy of the round window niche. Acta Otol Rhinol Laryngol 95:444-446). For the tegmen, the term canonus fossulae fenestrae cochleae has been suggested as it forms a canopy overhanging the cochlear window (Topsakal V, Matulic M, Assadi MZ, Mertens G, Van Rompaey V, Van de Heyning P 2020 Comparison of the surgical techniques and robotic techniques for cochlear implantation in terms of the trajectories toward the inner ear. J Int Adv Otol 16:3-7).

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