. Cunninghams Lehrbuch der Anatomie. Anatomie. Pars ossea Externer akustischer meatu Recessus epitympanicus Hammer Cochlea Cavum tympani Membrana tympani A. carotis interna Crus antihelicis minderwertig= Cyrnba conchse Crus helicis Pars cartilaginea Externer akustischer MEATUS Cavum conchse Untere Begrenzung der Incisura intertragica Abb. 707. Frontale Abschnitt von acht Ohr: Anteriore Hälfte von Abschnitt, gesehen von der Rückseite (natürliche Größe). Finger in den Meatus, und dann abwechselnd Öffnen und Schließen des Mundes. Das kondylus des Unterkiefers liegt vor der pars ossea, während zwischen der kondylus

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. Cunningham's Text-book of anatomy. Anatomy. Pars ossea of external acoustic meatu Recessus epitympanicus Malleus Cochlea Cavum tympani Membrana tympani Internal carotid artery Crus antihelicis inferior =~ Cyrnba conchse Crus helicis Pars cartilaginea of external acoustic meatus Cavum conchse Lower boundary of incisura intertragica Fig. 707. Frontal Section of Eight Ear : Anterior Half of Section, viewed from behind (natural size). finger into the meatus, and then alternately opening and shutting the mouth. The condyle of the mandible lies in front of the pars ossea, while between the condyle and the pars cartilaginea a portion of the parotid gland is sometimes present. Behind the pars ossea, and separated from it by a thin plate of bone, are the mastoid air-cells. Structure of the Meatus.—The cartilage of the meatus, directly continuous with that of the auricula, is folded on itself to form a groove, opening upwards and backwards, the margins of which are connected by fibrous tissue. The medial end of the cartilaginous tube is firmly fixed to the lateral margin of the bony meatus, whilst its lateral extremity is continuous with the cartilage of the tragus (p. 829). Two fissures exist in the anterior portion of the pars cartilaginea, and are filled by fibrous tissue. In> the lateral part of the meatus the cartil- age forms about three- fourths of the circum- ference of the tube; but, near the medial end of the pars cartil- aginea the cartilage forms merely a part of the anterior and lower boundaries of the canal. Condyle of mandible Parotid gland. Concha Bony part of auditory tube Internal carotid artery Membrana tympani First turn of cochlea Cavum tympani Mastoid air-cells Transverse sinus FIG. 708. —Horizontal Section through Right Ear; Upper Half of Section, seen from below (natural size). The pars ossea of the meatus is described on p. 127 ; but it may be well to state here that in the new-born child it is represented only by an incomplete ring of bone,

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• bookcentury1900
• bookdecade1910
• booksubjectanatomy
• bookyear1914