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Surgical anatomy of the hypotympanum

  • D. SaviČ (a1) and D. Djerič (a1)

Abstract

Anatomical characteristics of the hypotympanum were tested on 50 temporal bones. The hypotympanum has the shape of an irregular bony groove which is surrounded by five walls. The outer wall is formed by the tympanic part of the temporal bone. In 65 per cent of the cases the inner wall is formed by part of the petrous bone which extends under the promontory; in 25 per cent it is formed only by the lower part of the promontory; and in 10 per cent it corresponds to the juncture of the promontory and the petrous bone. The lower wall is clearly defined in 48.2 per cent of cases and corresponds to the juncture of its inner and outer walls. In 65 per cent of cases a recess of the inferior hypotympanic sinus is found on the floor of the hypotympanum. In 25.3 per cent of cases the jugular bulb protrudes into the tympanic cavity. In 73.4 per cent of cases the front wall is formed by part of the petrous bone which extends from its floor towards the tympanic opening of the protympanum, and in 26 per cent of the cases it is formed by the wall of the internal carotid artery. On the front wall, in 22.4 per cent of cases, a recess of the anterior hypotympanic sinus is found. The back wall is formed by elements of the styloid complex and in five per cent of the cases a recess or posterior hypotympanic sinus is found on it.

Copyright

Corresponding author

Professor Savic, D. M.D., Ph.D., Clinic of Otolaryngology, Medical Faculty, University of Belgrade, 11000 Belgrade, Pasterova 2, Yugoslavia.

References

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Ballantyne, J. (1979) Anatomy of the ear. In Scott-Brown's Diseases of the Ear, Nose and Throat, 4th edn. vol. 1. Basic Sciences, Butterworths, London-Boston, pp. 165.
Djerič, D. and Savič, D. (1984) Anatomical variations and relations of the bulbus vene jugularis and the cavum tympani. Abstracts XIV Yugoslav-Greek-Italian-Congres of Oto-Neuro-Ophthalmo-Neu-rosurgery, Ohrid, 38 pp.
Mawson, S. and Ludman, H. (1979) Diseases of the ear, 4th edn. vol. 1. Textbook of Otology, Edward Arnold, London pp. 1565.
Savič, D. and Djerič, D. (1985) Anatomical variations and relations of the medial wall of the bony portion of the Eustachian tube. Acta Otolaryngologica (Stockholm), 99: 551556.
Spector, G. (1981) Development of the hypotympanum in the human fetal and neonatal temporal bones. Annals of Otology, Rhinology and Laryngology, 90 (Supplement 88): 120.
Spector, G. (1984) Development of temporal bone anatomy and its clinical significance. Annals of Otology, Rhinology and Laryngology, 93 (Supplement 112): 101112.
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The Journal of Laryngology & Otology
  • ISSN: 0022-2151
  • EISSN: 1748-5460
  • URL: /core/journals/journal-of-laryngology-and-otology
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