. Elementary physiology . Fig. 91.—Medial section of the face and neck, sphenoid bone; 2, nasal cavity ; 3, brain cavity; 4, ethmoid bone ; 5, frontal bone; 6, nasal bone; 7, superior maxillary bone ; 8, palatal bone ; 9, superior turbinated bone ; 10, middle turbinated bone ; 11, inferior turbinated bone ; 12, soft palate ; 13, upper part of pharynx ; 14, lower part of pharynx ; 15, oesophagus ; 16, larynx ; 17, glottis ; 18, epiglottis ; 19, opening of Eustachian tube ; 20, inferior maxillary bone ; 21, tongue ; 22, tonsil; a to f, bodies of cervical vertebrae ; s, spinal cord ; /, pro- cess
. Elementary physiology . Fig. 91.—Medial section of the face and neck, sphenoid bone; 2, nasal cavity ; 3, brain cavity; 4, ethmoid bone ; 5, frontal bone; 6, nasal bone; 7, superior maxillary bone ; 8, palatal bone ; 9, superior turbinated bone ; 10, middle turbinated bone ; 11, inferior turbinated bone ; 12, soft palate ; 13, upper part of pharynx ; 14, lower part of pharynx ; 15, oesophagus ; 16, larynx ; 17, glottis ; 18, epiglottis ; 19, opening of Eustachian tube ; 20, inferior maxillary bone ; 21, tongue ; 22, tonsil; a to f, bodies of cervical vertebrae ; s, spinal cord ; /, pro- cesses of cervical vertebrae ; o, portion of occipital bone. numbers, in loo parts by volume, about 79 parts of nitrogen, 21 of oxygen, and but 3 parts in 10,000 (in good air) of carbon dioxide, while expired air contains about 4 per cent, of carbon dioxide, only 16 per cent, of oxygen, and the balance of nitrogen. The presence of carbon dioxide in expired air can ^ See p. 192.
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Keywords: ., bookcentury1800, bookdecade1890, bookpubli, booksubjectphysiology
