Radial Bundle

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Radial Bundle

 

in botany, a group of vascular root tissues. In the radial bundle, alternating groups of primary xylem and phloem that originated from individual bundles of procam-bium are arranged along the radii. Around the periphery, the radial bundle is surrounded by a layer of pericyclic cells that are adjacent to the inner layer of primary cortex, the endoderm. In the center of the root arises either a metaxylem vessel or parenchymal or mechanical tissue. In monocotyledons, the primary structure is retained throughout the life of the root; in dicotyledons, with the appearance of the cambium, the root acquires a secondary structure.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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As in mammals, the avian iris musculature is organized into sphincter and dilator muscles whose fibers are respectively arranged into cross and radial bundles. The origin of such fibers is actually subject to various assumptions.
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These results suggest that the radial bundles are indeed actinbased.
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