File:Abbott 201.jpg

From Embryology

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Fig. 20. Sagittal section through the heart region of an embryo 8 mm long

X 40, No. 113 of Prof Franklin P. Mall's collection. B, bulbus cordis; A.V.B., auriculoventricular bundle; A.F., annulus fibrosis; I.V.C., interventricular canal; F.O'., ostium primum; P.O". ostium secundum; S.I., septum primum; E-, endocardial cushions. Note the extensive development of the endocardial cushions -within the auricle. (From the article by F. P. Mail in the American Journal of Anatomy, July 15, 1912.)

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