Syntitium

A syntitium is a cytoplasmic region containing a lot of nuclei. The best example is the myoskeletal cells.

The ability for cardiomuscles to contract all at once (because of gap junctions) is called functional syntitium. This is important in the cardiovascular system in order to make sure that the blood is able to get to the places needed (the cardiomuscles having intercalated disks allow for this).