Micronemes are specialized organelles found in the apical region of a number of eukaryotic cells, including some protozoans and sporozoans. They are involved in the secretion of adhesion molecules and enzymes that are important for cell invasion and survival. Some synonyms for the word "microneme" are "secretory organelle," "intracellular vesicle," and "exocytic granule." Micronemes are also known by other names, such as "apical complex organelle," "rhoptry," and "polar tube." These different terms reflect the diverse functions and structures of these organelles, as well as the variety of organisms in which they are found. Regardless of the terminology used, micronemes play a critical role in the survival and replication of many cells and organisms.