. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. 218 THE VASCULAR SYSTEM. were drawn, transverse bands (cut long-itudinally), 0*33 nun. in length, were numerous ; their central ends terminated in bands, the fibres of which were cut transversely. The auricular septum (Fig. 141 a 31) also possesses muscular fibres which cross one another in its substance. The fibres of the truncus arteriosus resemble those of an ordi- nary artery; those of the sinus venosus are arranged in rings, mostly transverse, but others oblique, and a few longitudinal.] (2) The structure of the cardiac m
. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. 218 THE VASCULAR SYSTEM. were drawn, transverse bands (cut long-itudinally), 0*33 nun. in length, were numerous ; their central ends terminated in bands, the fibres of which were cut transversely. The auricular septum (Fig. 141 a 31) also possesses muscular fibres which cross one another in its substance. The fibres of the truncus arteriosus resemble those of an ordi- nary artery; those of the sinus venosus are arranged in rings, mostly transverse, but others oblique, and a few longitudinal.] (2) The structure of the cardiac muscle-fibres (Figs. 138 and 141 a). [The cardiac muscle of the frog consists of spindle-shaped cells, which as Pohl-Pincus pointed out, are of two kinds ; the main differ- ence between the two being in the size of the nucleus, which is much broader in one than in the other. Fig. T38. rj/. B ..c& Portion of a transvei-se section through tlie middle of the ventricle of /?. femporaria. From same heart aa the sections in Fig. 136. Oc. I, Syst. 7, Leitz.—G. H. A Rod-shaped nuclei of muscle fibre. B Oval nuclei of muscle fibre. CM Circular layer of muscle. CT Connective-tissue. B Endothelium of the epicardium. TM Transverse muscle. a. Cells with a broad nucleus (Fig. 138 ^) : the nucleus is lenti- cular or egg-shaped, 4 to 7 jix broad, 8 to 14 or 18 m lo^gi the ratio of length to breadth being i : 2. /3. Cells with a narrow nucleus (Fig. 138 J) : the nucleus is. 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 Ecker, Alexander, 1816-1887; Haslam, George. Oxford, Clarendon Press
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