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Description, references to Fig. 1:

'Sketch of the section of heart of adult Rat, showing junction of right auricle and ventricle. In the upper part of the figure is the outer wall of the right auricle, below and to the right is the wall of the right ventricle, and below and more to the left is the mass of tissue from which springs the auriculo-ventricular valve. The cavity of the heart is to the left. It is seen that a band of muscle runs almost completely round from auricle to ventricle, bordering closely upon the cavity of the heart. At the lower part this band becomes continuous with a network of branched muscle cells lying in the interval between auricle and ventricle. These branched fibres become continuous on the right with the muscular tissue of the ventricle. 


Description, references to Fig. 2:

A small portion of Plate XII., Fig. 4, drawn under the one-twelfth oil immersion, to show the character of the muscular fibres lying in the fibrous tissue. They are seen to be sometimes fusiform, sometimes much branched cells, the branches being either comparatively thick or tapering off to very fine threads, which again become larger,. again branch, and are connected into a network with the branches of other similar cells. The nucleus usually causes a bulging of the celL Transverse striation is usually very well marked.