As you can see there is a small disk, this is how they gain access to 'fill 'em up' as we call it. When Anna goes in for a 'fill up', 'enhancement' or expansion (to be more technical) the nurses have her lay back on the table and they add about 60 ml of saline into each expander. Anna can only feel the needles go through her skin on one side as the port is closer to the top of her chest, where there are still some nerve endings, (with the mastectomy her nerves were removed...so no feeling on top of her skin). The only other pain associated with this is the feeling of added pressure from the expanders getting bigger, except for one side had a drain in for about 5 weeks which added to the discomfort. Since that drain was removed the expanders haven't been too bad, considering. The expansion process had to be completed before radiation could be started as once her skin is radiated it doesn't expand as well.
Here is Anna with her syringes...one for each side.