Human anatomy, including structure and development and practical considerations . -ing due to the obliquityof the drum-head andthe outward protrusionof the tragus. Thecanal is ahiiost as longin the infant as in theadult. Structure.—Theexternal auditory canalis composed of an outercartilagino-membranous(cartilaginous) and of aninner bony portion, bothof which, as well as theexternal surface of thetympanic membrane, arelined by skin. The car-tilagino- membranouspart contributes something more than one-third of the entire length of the canal,and is a continuation of the cartilage of the auricle.
Human anatomy, including structure and development and practical considerations . -ing due to the obliquityof the drum-head andthe outward protrusionof the tragus. Thecanal is ahiiost as longin the infant as in theadult. Structure.—Theexternal auditory canalis composed of an outercartilagino-membranous(cartilaginous) and of aninner bony portion, bothof which, as well as theexternal surface of thetympanic membrane, arelined by skin. The car-tilagino- membranouspart contributes something more than one-third of the entire length of the canal,and is a continuation of the cartilage of the auricle. The cartilage of the canal,histologically of the elastic type, does not form a complete tube, but is deficient atits upper back part, where it is filled in by fibrous tissue. On approaching thebony portion, this deficiency in the cartilage is more marked and the fibrous tissuecorrespondingly increased. Two or more slit-like apertures, the fissures of Santorini rincisurae cartilag-inis meatus acustici cxtcrni) are usually found traversing the cartilagino-membranous Fig. Lateral sinus Frontal section passing through right ear, showing external, middle,and internal divisions; section is seen from in front. Condyle of jaw Cartilaginous canal Tympanic membrane External auditory canal Mastoid cells ,/ Bony canal
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Keywords: ., bookauthormc, bookcentury1900, bookdecade1910, booksubjectanatomy
