And these are known as T tubules or transverse tubules that is shown in orange. So basically, these T tubules go inside the cell and they are perpendicular to our myofiable. So if the myofiables'extend this way, our T tubules go inside the cell perpendicular at a 90 degree angle. Now, what's so special about our T tubules? What is the function of these channels known as T tubules? Basically, these tubules extend to our sarcoplasmic reticulum and the T tubules allow for a quick and rampant activation of those sarcoplasmic reticulum.