. An elementary course in practical zoölogy [microform]. Zoology; Zoologie. THE LARYNX. 9 10. 11. 12. 149 away this muscle from one side and see that the cri- coid cartilage widens as it passes backward. How are the cricoid and thyroid hinged together? Projecting upward and backward from the top of the larynx are two curved yellowish cartilages, the aryte- noid cartilages. Move them about to see that they are movable and that they rest on the upper edge of the back part of the cricoid cartilage. With one hand move the arytenoid cartilages back- ward and forward, meanwhile watching the inside o
. An elementary course in practical zoölogy [microform]. Zoology; Zoologie. THE LARYNX. 9 10. 11. 12. 149 away this muscle from one side and see that the cri- coid cartilage widens as it passes backward. How are the cricoid and thyroid hinged together? Projecting upward and backward from the top of the larynx are two curved yellowish cartilages, the aryte- noid cartilages. Move them about to see that they are movable and that they rest on the upper edge of the back part of the cricoid cartilage. With one hand move the arytenoid cartilages back- ward and forward, meanwhile watching the inside of the larynx from its lower opening. The projecting ridges, which meet just back of the Adam's apple, are the vocal cords. What effect is produced on the vocal cords by the movements of the arytenoid carti- lages ? Observe the connection of the thyroid cartilage with the cricoid by means of a downward projection of the former. Cut away all of this half of the thyroid cartilage. Notice the slender hyoid bone loosely connected with the upper bone of the thyroid. Examine now the muscles which move the arytenoid cartilages. a. On each side of the posterior surface of the cri- coid is a muscle passing upward to be attached to the corresponding arytenoid; this is the poste- rior crico-arytenoid muscle. Dissect it loose from the cricoid, at its origin below. By pulling, determine Its action on the arytenoid, and through the arytenoid on the vocal cord. Arising from the upper edge of the side of the cricoid cartilage, and passing upward and back- ward to the arytenoid, is the laterai crico-aryte-. b. :. 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 Colton, Buel P. (Buel Preston), 1852-1906. Halifax, N. S. : T. C. Allen; Boston : D. C. Heath
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
