Mapping of the microcirculation in the chick chorioallantoic membrane during normal angiogenesis.

Microvascular Research
D O DeFouwR N Feinberg

Abstract

The microcirculation within the chorioallantoic membrane (CAM) of the chick is particularly well suited for in vivo observation and has been used extensively as an assay to detect angiogenic activity. Although progressive chronological expansion of the CAM capillary network occurs normally during embryogenesis, descriptions of the branching patterns of CAM pre- and postcapillary microvessels during embryonic development have not been recorded. In the present study chick embryos were incubated, using an established shell-less culture technique, and observed in vivo at Days 6, 10, and 14 of embryonic development. Morphometric analyses of photomicrographs of CAM microvessels were based upon the centripetal ordering method of microvascular mapping of the first three orders of pre- and postcapillary microvessels with the capillaries serving as the initial point of reference. For both pre- and postcapillary vessels, the number of first-order vessels exceeded the number of second-order vessels which, in turn, outnumbered third-order vessels during each observation period. First- and second-order vessels progressively increased in number from Day 6 to Day 14; however, the number of third-order vessels remained essentially constant duri...Continue Reading

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