脊椎動物迷路骨包および膜様迷路の比較解剖学的研究
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概要
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The auther studied comparatively the fine structure of bony otic capsule and otic sac varies in 28 different species of vertebrates including 3 amphibians, 3 reptiles, 3 birds, and 19 mammals with the measurement on the thickness of bony otic capsule and area of labyrinthine spaces. I. Histological studies. The conclusions were as follows: I. Histological studies. 1) The bony otic capsule of vertebrates is composed of three layers of bone ; namely periostal, the intrachondrial combined withe the endochondral and the endosteal, but in amphibians and reptiles, middle layer was only partially observed. 2) In mammals and birds, the bony otic caps-ule is composed of compact bone, and its structure in the middle layer is so called lock of hair, but in reptiles and amphibians, its otic capsule is composed of fibrous tissue and the middle layer is mottled. 3) No significant histological difference was observed between grasseating and flesh-eating animals, as well as between land and quatic animals. 4) In lower animals, the bony otic capsule is not ossificated, but has the character of fibrous con-nective tissue. In reptiles and amphibians, cartila-gious tissue was observed. The cartilaginous inte-rglobural space shows remarkable difference according to the species of animals. It was found in almost all mammals except pipistrellus abramus and white rat, but could not be found in birds, reptiles and amphibians. 5) The blood vessel stretch is more significant for lower animals. It is especially significant in reptiles, amphibians, birds, and pipistrellus abramus, and osteoblasten was observed in reptiles and amphibians. 6) Bone cells are ripe in human species, and unripe in other animals. 7) The development of otic sac was roughly in proportion to that of bony otic capsules. 8) As to the property of bone cells and mat rative histology, that the bony otic capsule of human species is most complete. II. Measurements. 1) The thickness of the bony otic capsule is roughly in proportion to the size of the skulls of animals. 2) The ratio of the total cross section area of the cochlear spaces to the size of the skull is larger for lower animals. 3) The boundary of each layer is distinct for the animals having thin middle layers, but not so distinct for most animals having thick middle layers.
- 社団法人 日本耳鼻咽喉科学会の論文