. The anatomy of the human body. Human anatomy; Anatomy. 430 SPLANCHNOLOGY. The superficial position of the surface enables us to examine its different parts through the integuments, and renders it liable to wounds. Its still greater proximity to the skin in the median line has suggested the operation of laryngotomy. Posterior Region {figs. 141, 171).—In the median line we observe a prominence like a small barrel, on either side of which the thyroid cartilage projects. This prominence is formed by the back of the cricoid, and by the arytenoid cartilages, the expanded portion corresponding with
. The anatomy of the human body. Human anatomy; Anatomy. 430 SPLANCHNOLOGY. The superficial position of the surface enables us to examine its different parts through the integuments, and renders it liable to wounds. Its still greater proximity to the skin in the median line has suggested the operation of laryngotomy. Posterior Region {figs. 141, 171).—In the median line we observe a prominence like a small barrel, on either side of which the thyroid cartilage projects. This prominence is formed by the back of the cricoid, and by the arytenoid cartilages, the expanded portion corresponding with the bases of the latter, which are covered by folds of a pale mucous membrane. Under this membrane we find, proceeding from above downward, the ary- tenoideus muscle, the vertical ridge of the cricoid cartilage, the crico-arytenoidei posti- ci, and the crico-arytenoid articulations. On each side of the barrel-shaped prominence is a deep angular groove, formed by the meeting of two flat surfaces, which are separated above, but approximated below ; along these grooves it is supposed that liquids flow during deglutition. The external wall of each groove is formed by the posterior surface of the thyroid cartilage, the os hyoides, and the thyro-hyoid membrane. The internal wall is formed by the upper and lateral part of the barrel-shaped prominence. The grooves are lined by a closely-adherent mucous membrane ; and it should be observed, that they exist only on a level with the aryte- noid cartilages, and, consequently, in this region alone is the larynx protected by the thyroid cartilage, the posterior borders of which rest upon the vertebral column. The back of the cricoid cartilage is on a level with the posterior borders of the thyroid {fig. 174), and, like them, rests upon the vertebral column. The Internal Surface of the Larynx.—The internal surface of the larynx does not cor- respond, either in shape or dimensions, with its outer surface ; and this depends princi- pally o
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