. The anatomy of the human body. Human anatomy; Anatomy. 426 SPLANCHNOLOGY. cartilage to the tubercular extremities of the great cornua of the os hyoides. We often find a cartilaginous or bony nodule in these ligaments. There is a very distinct synovial capsule between the posterior surface of the body of the OS hyoides and the upper part of the thyroid cartdage. Its presence attests the fre- quent movements w^hich lake place between these parts, and during which the middle and upper part of the cartilage is placed behind the os hyoides. The Tracheo-cricoid Articulation.—The first ring of the
. The anatomy of the human body. Human anatomy; Anatomy. 426 SPLANCHNOLOGY. cartilage to the tubercular extremities of the great cornua of the os hyoides. We often find a cartilaginous or bony nodule in these ligaments. There is a very distinct synovial capsule between the posterior surface of the body of the OS hyoides and the upper part of the thyroid cartdage. Its presence attests the fre- quent movements w^hich lake place between these parts, and during which the middle and upper part of the cartilage is placed behind the os hyoides. The Tracheo-cricoid Articulation.—The first ring of the trachea is connected with the lower border of the cricoid cartilage by a fibrous membrane of the same nature as that between the rings of the trachea. A small vertical fibrous cord is added to it in the median line in front. This membrane permits some movements between the cricoid cartilage and the first ring of the trachea, and in these the sides of the ring are buried behind the cricoid cartilage. The intrinsic articulations are the crico-thyroii and the crico-arytenoid. I need merely remind the reader of the articulation between the arytenoid cartdages and the cornicula laryngis. The Crico-thyroid Articulations.—These are arthrodial. Each of the lesser cornua of the thyroid cartilage terminate in a plane surface, directed downward and inward, which rests upon a similar plane surface {m,fig. 177) on the cricoid cartilage, directed upward and outward. An orbicular or capsular ligament {rejigs. 174, 175), composed of shining, fasciculated, and parallel fibres, surrounds the articulation, which is provided with a synovial membrane. The posterior fasciculus is remarkable for its length and shape, and extends nearly to the crico-arytenoid articulation. In some subjects the orbicular ligament is very loose, in others the articulation is exceedingly close. The movements are limited to simple gliding, combined with a forward and backward movement of the thyroid cartilage. The dir
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