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دیسک قاعدهای
The "foot," or basal disc, enables the animal to stick to rocks or the undersides of pond plants.
The animal's polarity, however, is coordinated by a series of morphogenetic gradients that permit the head to form only at one place and the basal disc to form only at another.
When a basal disc is grafted to the middle of a host hydra, a new axis also forms, but with the opposite polarity, extending a basal disc (FIGURE 22.4B).
These experiments have been interpreted to indicate the existence of a head activation gradient (highest at the hypostome) and a foot activation gradient (highest at the basal disc).
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