Abstract: Apparatus for examining a cavity in a body, comprising a cannula with accessories which via the cannula can be disposed to extend into such cavity. At least one accessory is arranged to receive one or more conductors. The accessory arranged to receive conductors comprises a relatively stiff mandrin disposed for movement between a plurality of substantially parallel capillaries. Each capillary contains at least adjacent its end, a tubular body of translucent material, the ends of said tubular bodies remote from the respective capillaries being connected to each other and to the end of the mandrin. The apparatus is arranged to receive at least one further accessory for introducing a light source into the cavity.