How do I get the GameObject that is inside my Collision

I am trying to get the GameObject that is inside my collider radius so that I can access its function using SendMessage. How could I access the gameobject and not only its collider.

I have something like this:

 void OnTriggerStay(Collider myTrigger){
 
         if(isExploded)
         {
             myTrigger.gameObject.SendMessage("explodeEffect", SendMessageOptions.DontRequireReceiver);
         }
     }