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Fig. 2. Light micrograph of the origin of interarterial anastomoses (iaas)
from a segmental artery. Anastomoses originate as depressions through the
endothelial (E) and medial (M) layer of the primary vessel. Anastomoses follow
a linear perpendicular path to the outer margin of the adventitial (A) layer,
where they coil extensively (*). Note the numerous microvilli
(arrowheads). Scale bar, 10 µm. Lissamine Fast Red, 4 µm section.