Abstract
Summary
The right or left coronary arteries of the hearts of neonatal pigs were injected with a highly viscous barium sulfategelatine mass which quite regularly fills vessels down to a diameter of about 40 μ and which fails to enter capillaries or cross over into veins. No anastomoses were demonstrated in 29 hearts examined. This is in contrast to the findings in hearts of human term neonates which are endowed with collaterals of varying grades in most cases. The differences between the 2 species indicate that interarterial coronary anastomoses in hearts of neonates are not a general characteristic of the mammalian phylum but rather of man. Whether they are unique to the latter requires the study of neonatal hearts in other species.
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