Help determine the position of structures by the left and right side of the body Ipsilateral + Contralateral: used when comparing DIFFERENT structures Ipsilateral: different structures that exists on the same side of the body example: the right hand is ipsilateral to the right thigh Contralateral: different structures that exists on opposite sides of the body example: the left arm is contralateral to the right foot Unilateral + Bilateral: used when describing ONE structure Un