A text-book of clinical anatomy : for students and practitioners . Fig. 18.—Modes of transmission of infection from mastoid process. The arrowsshow the direction in which infection travels: (i) into temporo-sphenoidal lobe, TS; (2)into cerebellum, C; (3) into lateral sinus, SL, and M, free apex of mastoid into tissues ofthe neck. 61 Facial nerveCartilaginous por-tion Eustachiantube and levatorpalati StylopharyngeusPalatopharyngeus Lingual tonsil Posterior crico-arytenoid muscle. Antrum of mastoid Mastoid cellsMiddle turbinated Inferior turbin-ated Azygos uvulaeTonsil Aryteno-epiglotti-dean fol
A text-book of clinical anatomy : for students and practitioners . Fig. 18.—Modes of transmission of infection from mastoid process. The arrowsshow the direction in which infection travels: (i) into temporo-sphenoidal lobe, TS; (2)into cerebellum, C; (3) into lateral sinus, SL, and M, free apex of mastoid into tissues ofthe neck. 61 Facial nerveCartilaginous por-tion Eustachiantube and levatorpalati StylopharyngeusPalatopharyngeus Lingual tonsil Posterior crico-arytenoid muscle. Antrum of mastoid Mastoid cellsMiddle turbinated Inferior turbin-ated Azygos uvulaeTonsil Aryteno-epiglotti-dean fold Aditus laryngis Tubercle of San-torini Fig. 19. Beginning ofesophagus -Posterior view of pharynx and larynx, as shown in a coronal section of the skull madethrough the level of the mastoid processes 63 THE EAR. 65 It is exceedingly important to understand these anatomic relationswhen at the bedside of one suffering from middle ear mastoid antrum is also separated from the middle fossa of the skullby a thin plate of bone, the tegmen antri, so that infection may spreaddirectly from it to the overlying brain meninges and lateral sinus. Thelocation of the mastoid antrum is well seen in figure 14, also its relationto the lateral sinus. Externally, it corresponds to a slight depressionjust behind the bony elevation, known as the spine, immediately abovethe upper border of the bony external meatus. The mastoid processcontains a large number of cells which op
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