. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. THE LARYNX. 317 Fig. 207. SB. tissue. This is especially well marked on the vocal cords themselves. Behind the vocal cords the mucous membrane is much more loosely attached to the surrounding- structures by an extremely vascular areolar tissue. The epithelium is arrang-ed in a sing-le layer of columnar cells, among which are numerous goblet-cells. In the more external parts of the posterior ventricles, the mucous membrane is thrown into deep folds and so forms j)olygonal acini. In the median line of the floor of the larynx and
. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. THE LARYNX. 317 Fig. 207. SB. tissue. This is especially well marked on the vocal cords themselves. Behind the vocal cords the mucous membrane is much more loosely attached to the surrounding- structures by an extremely vascular areolar tissue. The epithelium is arrang-ed in a sing-le layer of columnar cells, among which are numerous goblet-cells. In the more external parts of the posterior ventricles, the mucous membrane is thrown into deep folds and so forms j)olygonal acini. In the median line of the floor of the larynx and behind the false vocal cords is a vertical fold of mucous membrane, which in- creases in height and breadth as it proceeds backwards towards the roots of the lungs. The mucous membrane behind the true vocal cords is extremely vascular, in the most posterior portion of the larynx the blood-vessels form a capillary network exactly like that of the lungs.] e. [The epiglottis (Fig. 306 E) is a small bilobed fold of mucous membrane placed on the floor of the mouth in the median plane and immediately in front of the aperture to the larynx. Between it and the mucous membrane covering the arytenoid cartilages are a number of large mvicous glands ( 6'). The epiglottis does not contain cartilage; it is, however, constant in its appearance and sharply marked off from the surrounding mucous membrane.] The Rima glottidis, seen fI'om the front. G Rima glottidis. SB Vocal cords. II. THE LUNGS. a. General description. The lungs are two large thin-walled sacs (Figs. 185 and 204 Lg and Lg^). The roots of the lungs are contracted at their origin from the larynx and then expand to form two ellipsoid sacs, which terminate posteriorly in bluntly-pointed ends. With the exception of their roots they lie entirely free in the pleuro-peritoneal cavity, and are covered by the pleuro-peri- toneal membrane. In the recent state they have a bright red colour due to the large supply of blood-vessels. b. Minut
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