. The elements of embryology . Embryology. THE HEART. 87 unpaired portion in front and two diverging limbs be- hind. The unpaired portion is the true heart, while the diverging limbs are the vitelline veins already spoken of (Fig. 28, sp). While the changes just spoken of have been taking place in the external form of the heart, its internal parts have also become differentiated. A cavity is formed in each of the halves of the heart before even they have coalesced. Each of these cavities has at first the form of an irregular space Fig. Transverse Section through the Posterior Part of
. The elements of embryology . Embryology. THE HEART. 87 unpaired portion in front and two diverging limbs be- hind. The unpaired portion is the true heart, while the diverging limbs are the vitelline veins already spoken of (Fig. 28, sp). While the changes just spoken of have been taking place in the external form of the heart, its internal parts have also become differentiated. A cavity is formed in each of the halves of the heart before even they have coalesced. Each of these cavities has at first the form of an irregular space Fig. Transverse Section through the Posterior Part of the Head of an Embryo Chick op Thirty Hours. hh. hind-brain ; vg. vagus nerve ; ep. epiblast; ch. notochord ; .r. thickening of hypoblast (possibly a rudiment of the sub- notoohordal rod); al. throat; ht. heart; pp. body cavity ; so. somatic mesoblast; sf. splanchnic mesoblast; hy. hypo- 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 Foster, M. (Michael), Sir, 1836-1907; Balfour, Francis M. (Francis Maitland), 1851-1882; Sedgwick, Adam, 1854-1913; Heape, Walter, 1855-1929. London ; New York : Macmillan
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Keywords: ., bookcentury1800, bookdecade1880, bookpubli, booksubjectembryology
