The top of the narthex forms a wide gallery, communicating with the interior at the triforium level.
The original triforium is transformed into a clerestory, the original clerestory being lost.
In the interior the sculptured triforium (15th century), the spiral staircase in the transept and a Holy Sepulchre are of interest.
The church, which rises high above the buildings clustering round it, consists of transepts and four bays of the nave of Romanesque architecture and of a fine choir (1450 - I 521) in the Flamboyant Gothic style with a triforium surmounted by lofty windows.
The nave and choir have aisles, triforium and clerestory.