Tissue dynamics of steady state growth in <i>Hydra littoralis</i>. II. Patterns of tissue movement

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<jats:title>Abstract</jats:title><jats:p>In the column of hydra, tissues continually move away from a region located just underthe whorl of tentacles. Above this subtentacular region, tissues proceed into the hypostome and tentacles; below it tissues pass into the buds or continue down the stalk. These movements represent a steady state pattern of tissue renewal in which column growth is balanced by tissue loss at the body extremities. But the existence of a subtentacular zone in which tissue appears stationary does not necessarily indicate that growth is restrictedto this region, as is commonly stated.</jats:p><jats:p>The body column of hydra can be viewed as an expanding cylinder whose elongation is balanced by tissue loss at the two ends. In such a body there must be one region from whichtissue appears to emanate, regardless of how growth is distributed along the cylinder. Only the <jats:italic>rates</jats:italic> at which tissues move will be characteristic of the underlying growthpattern. In <jats:italic>Hydra littoralis</jats:italic>, the measured rates of tissue movement down the gastric column are consistent with the distributions of mitotic figures, which indicate that growth is spread out along the column.</jats:p>

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