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The septation of the arterial pole of the heart in the chick embryo. IV. Discussion



The septation of the arterial pole of the heart in the chick embryo. IV. Discussion



Acta Morphologica Neerlando-Scandinavica 17(1): 21-32



Arterial pole septation of chick embryo heart starts in the mesenchyme ventrally to the foregut. Here the lumen of the truncus splits up into a cranially directed aortic stream (towards the 3rd and 4th pairs of arterial arches) and a caudally directed pulmonary stream (towards the 6th pair of arterial arches). The mesenchyme between the origins of both streams become accentuated as the wedge-shaped aortico-pulmonary septum. During the 5th day the aorta (ascendens), the pulmonary trunk and their ramifications move from a retropericardial position to an intrapericardial one. At the end of the 5th day the free edge of the aortico-pulmonary septum reaches the truncus myocardialis. The origins of the aortic and pulmonary stream have rotated from a pure ventral-dorsal position to a right-ventral and left-dorsal position, respectively. During the 1st half of the 6th day the aortico-pulmonary septum grows out into the fusing distal truncus ridges. During the 2nd half of the 6th day the fusion process extends in proximal direction. During the 7th day the left ventricular outlet will be separated from the right ventricular outlet. The proximal part of the truncus myocardialis forms the infundibulum of the right ventricle. Out of the distal part of the truncus myocardialis the aortic and pulmonary valves will develop. The origins of the aorta and pulmonary trunk rotate from their right-ventral and left-dorsal position at the end of the 5th day to an almost dorsal and ventral position, respectively, during the 6th and 7th day. The septum trunci lying in between the left and right ventricular outlet appears to be a straight septum and does not rotate.

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Accession: 068528944

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PMID: 452953


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