On the structure of the membrana tympani of the human ear / by Joseph Toynbee.

  • Joseph Toynbee
Date:
1851
Catalogue details

Licence: Public Domain Mark

Credit: On the structure of the membrana tympani of the human ear / by Joseph Toynbee. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    Explanation of the Figures. PLATE III. Fig. 1. The epidermoid layer having been removed by maceration, the two fibrous laminae and the mucous membrane are seen partially separated by dissection. (Natural size.) Fig. 2. The tubular cul-de-sac formed by the epidermis lining the external meatus ; the inner extremity corresponding with the membrana tympani is convex. (Natural size.) Fig. 3. The radiate fibrous lamina of the membrana tympani ; the fibres of which it is composed extend between the cartilaginous ring and the malleus, with the exception of the uppermost fibres, which are not inserted into the malleus. (Slightly magnified.) Fig. 4. The external surface of the membrana tympani, the epidermoid layer having been removed ; the upper part of the membranous meatus is seen to be con- tinuous with a membrane covering the upper and outer surface of the radiate fibrous lamina. [This membrane is the dermoid lamina of the membrana tympani; it is described in the Appendix to the paper as covering the whole of the outer surface of the radiating fibrous lamina.] Fig. 5. The fibres composing the radiate fibrous lamina. (Magnified about 300 diameters.) Fig. 6. The radiate fibrous lamina, external surface displaying the peculiar markings caused by the interlacement of the fibres. (Magnified about 300 diameters.) Fig. 7- The radiate fibrous lamina after having been treated with acetic acid. Fig. 8. The circular cartilaginous band after having been treated with acetic acid. Fig. 9. The external surface of the circular fibrous lamina; the fibres being attached to the processus longus of the malleus. (Slightly magnified.) Fig. 10. The internal surface of the circular fibrous lamina ; the long process of the malleus is seen through the translucent central part. (Slightly magnified.) Fig. 11. The fibres composing the circular fibrous lamina. (Magnified about 300 diameters.) Fig. 12. The circular fibrous lamina after being treated with acetic acid. Fig. 13. The radiate fibrous lamina, the circular fibrous lamina and the mucous membrane of the membrana tympani seen to be continuous with other structures. (Slightly magnified.) Fig. 14. The attachment of the incus and malleus, illustrative of the movements of the incus, malleus and membrana tympani. Fig. 15. The attachments of the tensor tympani ligament; the tendon of the tensor tympani muscle is drawn upwards so as to expose the ligament. Fig. 16. The insertion of the tensor tympani muscle and its attachment by strong ligamentous fibres to the inner part of the base of the cochleariform pro- cess.
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