Between the counterforts are 16 chapels, two side vestibules, a sacristy, a double worm staircase on the eastern side and a worm staircase on the western side. Each of the chapels has its own ribbed vault and is dedicated to the patron saints of its donors — the guilds, rich citizens and one to St. Bartholomew, patron saint of the abbot Bartoloměj of Osek.
The defensive structures are characterized by 16 chapels, two vestibules, a sacristy, and two staircases on each side. Each chapel has its own ribbed vault and is dedicated to the patrons of its donors: guilds, wealthy individuals, and St. Bartholomew, patron saint of the abbot Bartoloměj of Osek.