The Journal of laryngology and otology . Fig. 1.—Ricfht temporal bone of a child aged -i years, showing the middle earcleft ? after removal of its roof, the tegmen tympani. The cleft is seen tobe continuous, and the several cavities of the middle ear are clearly distin-guishable as modified parts of the primitive -^.^4f^ Fig. 2.—Right temporal bone of a child aged 4 years. The tegmen tympani hasbeen removed, and the different parts of the internal ear mapped out. Thespecimen shows the middle ear and its several cavities. Squamo-zygomatic element of temporal bone. Periotic cap
The Journal of laryngology and otology . Fig. 1.—Ricfht temporal bone of a child aged -i years, showing the middle earcleft ? after removal of its roof, the tegmen tympani. The cleft is seen tobe continuous, and the several cavities of the middle ear are clearly distin-guishable as modified parts of the primitive -^.^4f^ Fig. 2.—Right temporal bone of a child aged 4 years. The tegmen tympani hasbeen removed, and the different parts of the internal ear mapped out. Thespecimen shows the middle ear and its several cavities. Squamo-zygomatic element of temporal bone. Periotic capsule, antrum. Tympanic cavity. Eustachian tube. ear cleft, c. Cochlea, Semi-circular canal. Plate I. To illustrate the continuity of the several cavities of the middle ear. To /ace page ^6o, I ol. XX. Adlard t5- Son, I»ip. September, 1905.] Rhinology, and OtoIo§r/. 461 eai cleft is continuous, but a bulbous enlargement of the cleft whichforms the tympanic cavity is interpolated between the Eustachiantube and the mastoid antrum. This bulbous enlargement is dis-tinguishable at an earlier period, and it extends both upwards anddownwards. Its upward extension forms the epitympanic recessor attic. Its downward extension forms the hypotympanic recess. In still younger prepara
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Keywords: ., bo, bookcentury1800, booksubjectear, booksubjectnose, bookyear1887
