These are the questions that we're going to address in this lecture. So the centrosome is our Microcubial Organizing Center of Eukaryotic cells, also known as as MTOC. Now, one centrosome is found per Eukaryotic cells and only animal Eukaryotic cells have our centrosomes. Plant cells and fungi do not have centrosomes. They have other structures that are responsible for building microtubules, building and organizing microtubules. Now, every single one of our centrosome in any given Eukaryotic animal cell consists of a pair of two centrioles that are oriented at a 90 degree angle with respect to one another.