The nave is flanked by pointed arches surmounted by a gallery (triforium) which supports the groin vault, the first of this type built in Normandy (1130). The transept, in the centre of the church, houses the main altar. The northern transept is in Romanesque style, opening over a small apse (the chapel of the Blessed Sacrament) which houses the tabernacle. The southern transept is characterised by Gothiccolumns integrated within the Romanesque decoration.