. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. C JiK Ti. FIG. 279.—LARYNX OF ECHIDNA. (A, ventral, B, lateral, and C, dorsal view.) AL, arytenoids, with an intercalary piece, S1; RK, cricoid, with a dorsal intercalary piece, S ; SK, skeletal element which is partially subdivided into two portions ventro-laterally ; of these the anterior (t) corresponds to the greater cor mi of the hyoid of other Mammals (that is, to the 3rd visceral arch), and the posterior (*) gives rise to the anterior thyroid element ( = 4th visceral arch); SK', the posterior thyroid element ( = 5t
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. C JiK Ti. FIG. 279.—LARYNX OF ECHIDNA. (A, ventral, B, lateral, and C, dorsal view.) AL, arytenoids, with an intercalary piece, S1; RK, cricoid, with a dorsal intercalary piece, S ; SK, skeletal element which is partially subdivided into two portions ventro-laterally ; of these the anterior (t) corresponds to the greater cor mi of the hyoid of other Mammals (that is, to the 3rd visceral arch), and the posterior (*) gives rise to the anterior thyroid element ( = 4th visceral arch); SK', the posterior thyroid element ( = 5th visceral arch), with a basal piece or copula (c) ; Tr, trachea; ZB, body of hyoid (= copula of 2nd and 3rd visceral arches) : ZH, lesser cornu (-2nd visceral arch). still showing traces of its primary paired nature. This shield- shaped thyroid becomes separated from the hyoid, and surrounds the lateral and ventral regions of the larynx, overlapping the cricoid above,1 and serving as a point of origin and insertion for important intrinsic and extrinsic muscles. 1 The cricoid may be complete or incomplete ventrally, and its dorsal portion usually forms a broad plate with which the arytenoids are articulated (Figs. 280 and 281). The latter, growing out dorsally, may each give rise to a distinct corniculate cartilage (cartilage of Santorini). B K**. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wiedersheim, Robert, 1848-1923; Parker, W. N. (William Newton), d. 1923. London, Macmillan and co. , limited
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