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为研究乳突气房系统的种族差异,将人类四个种族(白人101人、黑人57人、爱斯基摩人108人及印第安人101人)的成人头颅骨行X线照相研究,结果可将乳突分成六型:(1)硬化型:致密的坚实骨质;(2)板障硬化型:疏松的、纤细的骨小梁骨部分与坚实的骨部分的结合;(3)板障型:疏松的、纤细的骨小梁结构为致密的骨质所包绕;(4)板障气化型:板障型乳突中显示一些气房;(5)气化型:乳突充满大小平均的气房;(6)高度气化型:乳突充满大的气房。在702个完整的乳突片中,无气房者为28.5％;其中黑人为
To study the racial differences in the mastoid air system, an adult skull radiography study of four human races (101 white, 57 white, 108 Eskimo, and 101 Indian) Divided into six types: (1) sclerosis type: dense solid bone; (2) plate sclerosis type: loose, slender trabecular part of bone and solid bone part of the combination; (3) Barrier type: loose , Slender trabecular bone structure is surrounded by dense bone; (4) Barrier gasification type: Barrier type mastoid show some air room; (5) Gasification type: Mastoid full size average Room; (6) highly vaporized type: mastoid full of large air rooms. Out of the 702 intact papillae, 28.5% were amenorrhagia; among them, blacks were