Apicomplexan parasites possess specialized secretory organelles (rhoptries and micronemes) that release their contents during host cell invasion. Although the rhoptries were once thought to be merely a bulbous protein reservoir connected to an anterior neck region, the localization of a protein specifically to the neck suggested that this region was more than just a duct. Recent studies have shown that the rhoptry neck sub-compartment possesses a distinct protein repertoire. Some of these proteins share common features, including conservation across the phylum and involvement in tight-junction formation. A sub-group of rhoptry neck proteins, the RONs, their association with the microneme protein apical membrane antigen AMA1, and their involvement in invasion are discussed.