Mastoid cells

A section of the mastoid process of the temporal bone of the cranium shows it to be hollowed out into a number of spaces, the mastoid cells, which exhibit great variety in their size and number.

At the upper and front part of the process they are large and irregular and contain air (a form of skeletal pneumaticity), but toward the lower part they diminish in size, while those at the apex of the process are frequently quite small and contain marrow; occasionally they are entirely absent, and the mastoid is then solid throughout.

单词	Cellulae mastoideae
释义	Cellulae mastoideae 英语百科 Mastoid cells A section of the mastoid process of the temporal bone of the cranium shows it to be hollowed out into a number of spaces, the mastoid cells, which exhibit great variety in their size and number. At the upper and front part of the process they are large and irregular and contain air (a form of skeletal pneumaticity), but toward the lower part they diminish in size, while those at the apex of the process are frequently quite small and contain marrow; occasionally they are entirely absent, and the mastoid is then solid throughout.
随便看	rear的意思 rear abutment pressure的意思 rear access的意思 Rear Adm.的意思 rear admiral的意思 Rear Admiral Lower Half的意思 rear admiral的意思 Rear Admiral Upper Half的意思 rear air cylinder的意思 rear alxe bogie的意思 rear and front axle stand的意思 rear aperture的意思 rear apron的意思 rear arch的意思 Rear Area的意思 rear arm的意思 rear arrangement的意思 rear attack的意思 rear auto window的意思 rear auxiliary的意思 Rear axle的意思 rearaxle的意思 rear axle and suspension的意思 rear axle bearing lubricant nipple的意思 rear axle bearing oil seal的意思

Cellulae mastoideae

Mastoid cells