Now, once our organism, once our human basically becomes a full adult, when they reach the age of 25, this plate essentially stops growing and the Epiphysical plate turns into our Epiphysical line. That means it stops growing. Now let's move on to this long section that actually consists of our curved shaft. This is known as our diaphysis. So the long shaft region of the bone is called our diaphysis. And this contains a section known as armidoolery cavity, also known as the marrow cavity.