It is that region which initiates the development of microtubules. This region is called the centrosome. It is the centrosome and not the centriole which is responsible for making spindles because what we call 'spindle fibres' are basically microtubules. This explains why plant cells and fungi can produce spindle fibres during mitosis.
expedient(Noun) A method or means for achieving a particular result, especially when direct or efficient; a resource. expedient(Adjective) Simple, easy, or quick; convenient. Most people, faced with a decision, will choose the most expedient option.
adj. 1  1. Suitable or efficient for accomplishing a purpose: thought email was the most expedient way to communicate with distant relatives. 2  2. Convenient but based on a concern for self-interest rather than principle: changed his position when it was politically expedient. 3  3. Obsolete Speedy; expeditious.