A practical treatise on the diseases of the ear including the anatomy of the organ . ympanum,y Incus—Stapes. f Obturator of im-J Mallei Superior. movable joints. 5. Muscles. j Tensor Tympani. 1 ] Mallei Incudis Supe 6. Mucous Membrane. 7. Vessels. 8. Nerves. 1. The dimensions of the tympanum, like those of the exter-nal auditory meatus, vary much in different individuals. Thefollowing table shows about the average diameters, as givenby Von Troltsch :* Antero-posterior diameterVertical Transverse 13mm. at anterior part, 5 to 8mm. at posterior 15mm. at anterior 3 to
A practical treatise on the diseases of the ear including the anatomy of the organ . ympanum,y Incus—Stapes. f Obturator of im-J Mallei Superior. movable joints. 5. Muscles. j Tensor Tympani. 1 ] Mallei Incudis Supe 6. Mucous Membrane. 7. Vessels. 8. Nerves. 1. The dimensions of the tympanum, like those of the exter-nal auditory meatus, vary much in different individuals. Thefollowing table shows about the average diameters, as givenby Von Troltsch :* Antero-posterior diameterVertical Transverse 13mm. at anterior part, 5 to 8mm. at posterior 15mm. at anterior 3 to opposite the drum-head, 2mm. 2. The anterior wall presents, at its upper part, an openingof considerable size—the tympanic orifice of the Eustachiantube. Below this is a strong bony plate. * Text-book, American translation, p. 171. CAVITY OF THE TYMPANUM. 197 The posterior wall separates the cavity of the tympanumfrom the mastoid cells. The opening into the cells is at itsupper part, close under the roof, and considerably higher thanthe orifice of the Eustachian The Eight Temporal Bone, with the Uembrana Tympani and Ossiada Auditus of an Adult. 1. Squamous portion—under figure 1 the sulcus of the transverse sinus runs downward. 2. Abristle passes through the mastoid foramen. 3. Mastoid cells. 4. Antrum of the mastoid,communicating both with the mastoid cells and ivith the tympanic cavity. 5. Styloidprocess. 6. Membrana tympani ; a point of mucous membrane of the tympanic cav-ity is seen under the number 6. 7. The malleus. Under the chorda tympani ice seethe divided tendon of the tensor tympani muscle. 8. The incus. 9. The short process. chorda tympani nerve. 11. The stapes. 12. Stapedius muscle. 13. Facial nerve. nerve, branch of facial. T?ie relations of the mastoid cells to the cavity of thetympanum and the relations of the former to the transverse sinus are well shown. AfterRiidinger. The outer wall of the tympanic cavity is composed
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Keywords: ., bookcentury1800, bookdeca, booksubjectear, booksubjecteardiseases
