Two types of microtubules have been found in testicular cells of the lovebird, Uroloncha striata var. domestica Flower, one of which in the developing spermatids and the other within the nutritive cells. The thin-walled (50Å) tubules appearing in the spermatids lie in a row within each layer of the lamellar sheath which appears helically coiled around the head and the middle piece. The thick-walled (100Å) tubules are in a single row or in a crystalline array within the cisternae of the endoplasmic reticulum, their physiological significance being unsettled in the present study.
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Yasuzumi et al. (1966) studied this question.
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