I am Episcopalian/Anglican, and on the individual church level, it works like thus:
Rector (Head Priest/Pastor)
Associate Priests (generally have a particular area of ministry in the church on which they focus, in addition to preaching and teaching, etc.)
Deacons (read the Gospel, lead service-oriented ministries)
Vestry--an elected board of leaders in the church.
So, the Rector is the leader and is ultimately responsible for the spiritual life and direction of the church. He/she does what pastors do in general, along with the associate priests if there are any (depends on size). There may or may not be deacons. In our denomination, deacons are not ordained at the congregational level, but at the denominational level, and a particular church may or may not be assigned a deacon depending on that church's needs/the availability of deacons in the area.
The vestry is really a powerful body in the church. Anything having to do with church finances and other administrative details must be approved by the vestry, even if it goes against the pastor's wishes. The vestry is elected by the congregation.
And then there's the staff, which includes people like Director of Music, Director of Children's Ministry, etc. They do not have authority, save over their own area. There's also an office called "Rector's Warden" and that person is kind of like the Rector's right hand man, helping things to get done.
As far as accountability is concerned, the vestry would be the ones to check a pastor if he's "off," but it's really more like, the head priest is accountable to the Bishop, who is in turn accountable to the Presiding Bishop and all the other Bishops in the denomination.