ORIENTED MICROTUBULES IN ELONGATING CELLS OF THE DEVELOPING LENS RUDIMENT AFTER INDUCTION

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Abstract
Subsequent ot lens induction in the chick embryo, many microtubles, 230 A in diameter and oriented parallel to the direction of cell elongation, appear in the cells of the presumptive lens ectoderm. These long, straight structures later reappear in a similar cortical array in the elongating cells of the posterior epithelium of the lens vesicle, as well as in other palisading embryonic tissues. These relationships in the chick embryo and similar associations between microtubules and shape changes in other types of cells reported in the literature suggest a general functional significance of these organelles in the production of cell asymmetries in morphogenesis.