. The American journal of anatomy . Fig. 26 Transverse .section. Embryo 16 mm. (No. 317). X 40. 27 ■-^ Fig. 27 Coronal section through the heart of an embryo 21 mm. long (No. 460).A square is around the atrio-ventricular muscle. DEVELOPMENT OF THE HUMAN HEART 289 ml&^.. Fig. 28 Enlarged drawing of the atrio-ventricular muscle shown in Fig. 360. 290 FRANKLIN P. MALL describes and pictures it in a specimen of the fifth month. Fahrstates that the bundle is less pronounced in the foetus than in theadult but that its position is the same. Tandler found it in anembryo 20 mm. long a
. The American journal of anatomy . Fig. 26 Transverse .section. Embryo 16 mm. (No. 317). X 40. 27 ■-^ Fig. 27 Coronal section through the heart of an embryo 21 mm. long (No. 460).A square is around the atrio-ventricular muscle. DEVELOPMENT OF THE HUMAN HEART 289 ml&^.. Fig. 28 Enlarged drawing of the atrio-ventricular muscle shown in Fig. 360. 290 FRANKLIN P. MALL describes and pictures it in a specimen of the fifth month. Fahrstates that the bundle is less pronounced in the foetus than in theadult but that its position is the same. Tandler found it in anembryo 20 mm. long as distinguishable even under low powersby its staining properties. The nuclei are dark and the cellborder stains faintly with eosin. At mm. the cells of thebundle have become larger both in the atrium and the ventricle. In suitable sagittal sections of the heart the atrio-ventricularbundle may be recognized in an embryo 8 mm. long (fig. 9) asa strand of tissue extending from the region of the sinus to theventricle. This tissue is somewhat separated from the rest bydelicate spaces and its cells stain somewhat more intensely thanthe rest. In embryo pigs 7 mm. long the bundle appears morelike epithelium with a tendency towards vesicle formation in theimmediate regi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1912
