. Elementary text-book of zoology. RANA. 341 From its ventral wall, large bilobed urinary rectum which opens into the cloaca, close to the cloacal aperture, is a bladder. Close to the pancreas, and near the head of the rectum, is a round reddish spleen, one of the ductless glands. At the extreme front end of the abdominal cavity there lies dorsally a pair of lungs. Each rests loosely in the cavity, but is attached anteriorly to the oesophagus. If the lungs be inflated by a blowpipe through the glottis they will be seen to consist of hollow sacs of great elasticity. When punctured they return t
. Elementary text-book of zoology. RANA. 341 From its ventral wall, large bilobed urinary rectum which opens into the cloaca, close to the cloacal aperture, is a bladder. Close to the pancreas, and near the head of the rectum, is a round reddish spleen, one of the ductless glands. At the extreme front end of the abdominal cavity there lies dorsally a pair of lungs. Each rests loosely in the cavity, but is attached anteriorly to the oesophagus. If the lungs be inflated by a blowpipe through the glottis they will be seen to consist of hollow sacs of great elasticity. When punctured they return to their former small bulk and soft condition. Fig. 240.—Diagram of Venous System of a Frog. (Ventral view.) External Jugular. Respiratory. Lingual. Mandibular. | Internal Jugular. Subscapular. Innominate. Sinus Venosus. The anterior abdominal is unlabelled, but is seen running forwards from the two pelvics to the portal. The frog fills its buccal cavity with air through the nares, and then -pushes upwards the floor of the cavity with its hyoid cartilage (or lingual plate). This forces the air down to the lungs and effects inspiration. The-air is expired by the, elastic walls of the lungs.* We may notice^ that the * The expiration may be assisted by contraction of the abdominal muscles upon the 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 Masterman, Arthur Thomas. Edinburgh, E. & S. Livingstone
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