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Show 3 16 DR. J. MURIE ON T H E [May 26, it is 0*8 inch broad and about as much in length or fore and aft diameter; glandular impressions stud its surface. There are well-marked fossae or upper laryngeal pouches (l.p) between it and the thyroid alae. The superior aperture of the larynx (ap) is narrow, and 0 8 inch long. Between it and the aforesaid pouches are two broad roughish prominences, together having a V-shaped outline; these elevations are due to the large arytenoids and cartilages of Santorini or Wrisberg ? with superimposed fatty tissue and membrane. As fig. A shows, tbe thyroid cartilage (7') is of moderate height (1*3 inch), breadth 1*5 inch, and obtuse in front, the pomum being bulbous but not very prominent. The upper or anterior cornu is remarkably short, barely projecting above the very shallow concave upper border. The posterior border is more deeply scooped out above, but reversely arched below. The inferior cornu is a cartilaginous rod half an inch long. Excepting a narrow deepish notch close to the inferior cornu, the lower border of the thyroid is straight. The front portion of the cartilage is of much firmer consistence than the lateral plates ; the latter are flat and without any marked oblique ridge. The hinder shield of the cricoid (Cr) is slightly more than 12 inch in vertical, and exactly that in transverse diameter. The surface is broadly convex in the same directions. The upper and lower margins are each widely rounded, the former being mesially concave, but the latter convex, and without any narrowed elongation. The inferior cornu is articulated a line above the lower lateral and wide-sweeping arciform border. The anterior ring completing the cricoid is some 0*3 inch broad throughout, and very moderately bent downwards or towards the trachea. The cricoid is altogether composed of a thicker substance than is the thyroid cartilage; its anteroposterior diameter is 1*7 inch, the front ring projecting as much as (but no more than), the boss of the pomum Adami. Each arytenoid (fig. 3 B, A) is a solid cartilaginous body of a trihedral figure, and 0*7 inch in extreme diameters. Individually the faces and borders are slightly concave. Upon the summit the cartilage of Santorini (S), or (Wrisberg?) projects. This is composed of soft yellow elastic ligament, narrow and falciform in figuie, and reaches in a tapering manner 0*3 inch behind the arytenoid cartilage. Its thickish part is close upon an inch long. There is, however, an apparent continuation of the same yellow elastic substance as a thin band, downwards and forwards, from the anterior apex of the arytenoid to tbe inner thyroid fossa, and constituting the inferior thyro-arytenoid ligament or true vocal cord. These cords approximate in front, but leave behind them a wide wedge-shaped inferior aperture of the larynx or rima glottidis. The superior thyro-arytenoid ligaments, or false vocal cords, are not well pronounced, hut still traceable from the fatty tissue above the corni-cula laryngis towards the epiglottis. The membrane between the false and true vocal cords is smoothish and perfectly free from sinuses or ventricles. I observed, though, on the inner mucous surface of the cricoid, and in part on the wall |
