A surgical system comprising: at least two modular units, the modular unitseach comprising: asurgical arm and a motor unit configured for actuating movement of thesurgical arm, the motorunit configured to be operably attached to the surgical arm, where a firstface of a motor unithousing generally defines a plane which is at an angle of 60-120° to along axis of the surgicalarm wherein the motor unit is configured to be aligned adjacent a motor unitof at least onesecond modular unit wherein a second face of a housing of the motor unitgenerally defines aplane which is at an angle to the first face and which comprises a connectiongeometry suitablefor connecting the housing of the motor unit to a housing of the motor unit ofthe second modularunit.
