. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Heart of the Tortoise. {After Bojanus.*) The ventricle opened in front, the left aorta laid open, and a bristle placed in the pulmonary artery. in size to the ventricle : they are divided by a septum, which, however, is perforated in the Testudo scorpioides. The right receives the blood of the body by means of the venae cavae, whilst the oxygenized blood from the pulmonary veins enters the left by a fissure- like valvular orifice. The internal arrangement of the ventricle varies somewhat in different instances ; in some,
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Heart of the Tortoise. {After Bojanus.*) The ventricle opened in front, the left aorta laid open, and a bristle placed in the pulmonary artery. in size to the ventricle : they are divided by a septum, which, however, is perforated in the Testudo scorpioides. The right receives the blood of the body by means of the venae cavae, whilst the oxygenized blood from the pulmonary veins enters the left by a fissure- like valvular orifice. The internal arrangement of the ventricle varies somewhat in different instances ; in some, e. g. the Testudo graeca, it is little more than a simple cavity, rendered irregular by the projecting bundles of fibres of its parietes ; in others, on the contrary, e. g., the T. imbricata, these fibres are so very prominent, and appear to divide the cavity so completely into several cells, that Mery was induced to admit the existence of a" ventricle for the pulmonary artery and aorta, in ad- dition to a right and left ventricle. Whether the cavity, however, be simple or compli- cated, the course of the blood through the heart is always such, that the pulmonary blood enters at the left side, is mixed with the blood of the venas cavae rather towards the back part of the heart, and then passes on the right side into the aorta, and anteriorly into the pulmonary arteries. The principal arterial trunks form a circle Fig. Heart of the Tortoise. (After BojanusS) The ventricle laid open in front, the pulmonary artery slit up, a bristle placed behind a columna caniea, which forms an imperfect septum. round the oesophagus, which we must consider as a repetition of the branchial arteries. The aorta, which in the T. imbricata is furnished with two semilunar valves, arises double from x 2. 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 perfect
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