Last there are the wards. Each ward has a bishop who has two counselors. The bishop is the president of the priest's quorum and the Aaronic Priesthood for the ward.
There is also an Elders Quorum Presidency that presides over the elders. Similar organization is found with the Relief Society, Young Women and Primary.
The young men have three quorums - deacons, teachers, and priests. Deacons and teachers have a presidency. Since the bishop is the president of the priests quorum, they have two assistants. The young women are divided into the beehives, miamaids, and laurels. Each class has a presidency.
Everything else in the ward falls somewhere under these organizations (such as the Ward Mission Leader, Primiary Teachers, etc.).