Sensor arrangement for sensing activity in a nerve or muscle, the sensor arrangement being arranged to be secured to an insertion member for insertion into a body cavity, the sensor arrangement (2) comprising a support for supporting one or more sensing elements, the support comprising a first zone (10a) and a second zone (10b) spaced apart longitudinally from the first zone, where each of the first and second zones are arranged to be secured to the insertion member to define a fixed spacing therebetween, wherein a plurality of strips (16) comprising one or more sensing elements bridge at least part of the spacing between the first and second zones, the strips being moveable laterally relative to the longitudinal length of the support.
