Near the nucleus is a dense area of cytoplasmic material called a centrosome. Within the centrosome is a pair of cylindrical structures called centrioles.
Each centriole is composed of nine clusters of three microtubules (triplets) arranged in a circular pattern.
Centrioles lack the two central signal microtubules found in flagella and cilia.
The long axis of one centriole is at a right angle to the long axis of the other.
Centrosomes serve as centers for organizing microtubules in nondividing cells and the mitotic spindle during cell division.
Like mitochondria, centrioles contain DNA that controls their self replication.
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