c l i n i c a l f o l i o s : n a r r a t i v e





A D V E R T I S E M E N T

 

Early Heart Formation: 7

A D V E R T I S E M E N T

   
 

The heart tubes fuse from the cephalad to the caudal end and the primary heart tube quickly develops sulci which demarcate the partially fused atrial region from the ventricle and bulbus cordis. The paired common inflow channels, the sinus venosus on either side, receive blood from the yolk sac via vitelline veins, from the placenta via the umbilical veins and from the body of the embryo from the cardinal veins. As the growing heart tube bulges into the pericardial cavity, the pericardium behind the heart forms a suspensory dorsal mesocardium. This is quickly fenestrated, forming the future transverse sinus behind the outflow end of the heart.     

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Early Heart Formation: 8

A D V E R T I S E M E N T

   
 

As the heart continues to elongate it begins to fold in the confines of the pericardial cavity. The bulbus moves to the right and the ventricle moves to the left forming a loop toward the embryo's right side. As the heart grows it bulges the ventral body wall above the attachment of the amnion and below the head fold. The oropharyngeal membrane lies just above the heart and the septum transversarum lies just below.      

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Early Heart Formation: 9

A D V E R T I S E M E N T

   
 

About day 24 the heart continues to enlarge and fold as the atria move in a cephalad direction behind the ventricle and bulbus. The attachment of the atria to the dorsal mesocardium will form the upper limit of the oblique sinus beneath and behind the heart. The transverse sinus lies behind the outflow end of the heart. At about this time, the second pair of aortic arches forms between the aortic sac and the dorsal aortae.     

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This page was last modified on 5/28/1999.