Abstract
The stromal surface of the mammary gland myoepithelial cells of rats under normal and experimental conditions, which were treated with HCl-collagenase method introduced by Evan et al. (1976), have been studied by scanning electron microscopy. Treatment of the mammary gland with HCl and collagenase removed almost completely the extracellular materials such as collagens and the basal lamina and revealed the myoepithelial cells enclosing the glandular alveolus. Myoepithelial cells consisting of an elongated cell body and long, bifurcating processes grasped the glandular alveolus in the form of a delicate network. With the application of oxytocin, the myoepithelial cells were involved in the morphological changes suggestive of contraction. They had a row of prominent folds arranged perpendicularly to the long axis of the cell body and its processes.
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