. Human embryology and morphology. Embryology, Human; Morphology. DEVELOPMENT OF THE CIRCULATORY SYSTEM. 245 formed the pleural cavities. The pleurae expand until, instead of lying as minute passages above and behind the pericardium, they come to completely cover it. The abdominal part of the coelom forms the peritoneal cavity; a small part on each side is shut off in the scrotum, the tunica vaginalis. The Pericardium.—In Fig. 202 the relationship of the heart to the pericardium is shown during the 3rd week of foetal life. The heart is tubular; the dorsal and ventral mesocardia (Fig. 193) have
. Human embryology and morphology. Embryology, Human; Morphology. DEVELOPMENT OF THE CIRCULATORY SYSTEM. 245 formed the pleural cavities. The pleurae expand until, instead of lying as minute passages above and behind the pericardium, they come to completely cover it. The abdominal part of the coelom forms the peritoneal cavity; a small part on each side is shut off in the scrotum, the tunica vaginalis. The Pericardium.—In Fig. 202 the relationship of the heart to the pericardium is shown during the 3rd week of foetal life. The heart is tubular; the dorsal and ventral mesocardia (Fig. 193) have already disappeared except at two points, where the heart still remains attached. These two points are (Fig. 202): (1) In front where the bulbus arteriosus passes out under the pharynx to divide into right and left ventral aortae from which the right and left visceral aortic arches arise. The mesocardium which binds it here may be named the arterial mesocardium. (2) Behind the sinus venosus is imbedded in the mesentery or posterior mesocardium, through which the great veins reach it. The mesocardium which binds it behind may be named the venous mesocardium. aorta sup. u. cau. venous meso-card. right pul. ueins venous meso-card. inf. u. cau aorta arterial meso-cardium pulm. art. transverse sinus left pul. veins diaph. oblique sinus Fig. of the Interior of the Pericardium showing the attachments of the heart to its dorsal aspect by the Arterial or Venous Mesocardia. In Fig. 203 is shown the fixation of the heart within the peri- cardium of the adult. The arterial and venous mesocardia can be recognised, only somewhat altered in position and form. (1) The bulbus arteriosus becomes the ascending aorta and. 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 Keith, Arthur, Sir, 1866-1955. London
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
