| OCR Text |
Show 1870.] ANATOMY OF THE PRONGBUCK. 347 of the trachea, a few irregular-contoured glandular-like depressions (gl., gl*) ; but these I am inclined to consider merely of pathological import. Fig. 3. Structure of the larynx of the male Prongbuck. A. Side view, with attached hyoid bone. Sh. Stylo-hyal. C. h. Cerato-hyal. Bh. Basihyal. Th. Thyro-hyal. 8. gl. Origin of the stylo-glossus muscle, &c. S.g2. A second, upper portion, which goes to the root and side of tongue. Ep. Epiglottis, p. Wrisbergian ? projections. Ar. Arytenoi-deus muscle. T. Thyroid cartilage. Cr. Cricoid cartilage, tr. Trachea; and * denotes the lateral ridging of the cartilage rings, u. Portions of the superior laryngeal nerve. B. Section of the larynx-half of the thyroid alae and tracheal rings being sliced through and partially removed to show the interior structure, vocal muscles, arytenoid and other cartilages. A. Arytenoid cartilage. S. Cartilage of Santorini; and, above this, p, fatty Wrisbergian ? projection. Th. a1, Lower, and Th. «2, Upper thyro-arytenoid muscles. L. c a. Lateral crico-arytenoideus. gl., gl.* Glandular depressions of pathological origin? The remaining letters apply as in Fig. A: a portion of the inferior cornu remains on the cricoid cartilage. C. Laryngeal aperture, looked at from above and behind, ap. Aperture of larynx, with the projections from the Wrisbergian ? cartilages. I.p. Laryngeal pouch. There is a double thyro-arytenoid muscle, the lower (Th.ai) being of equivalent volume to the upper (Th. a2); and both are strong muscular bands. The superior partly overlaps the inferior portion posteriorly ; and together they occupy the outer surface of the arytenoid cartilage, except so much as is taken up by the under-mentioned muscle. This, the lateral crico-arytenoid muscle (L. c. a), has a longish narrow belly, arising partly tendinous from the upper edge of the |
