Yolanda is asked to review a bone slide that her professor has set up under the microscope. She sees concentric layers surrounding a central cavity. Is this bone section taken from the diaphysis or the epiphyseal plate of the specimen?

Video transcript

Hi, everyone. Welcome back. Let's look at our next question. Which type of bone tissue contains osteon or aversion systems. Choice. A compact bone B, spongy bone, C both compact and spongy bones or d neither compact nor spongy bone. So osteon or aversion systems, just two names for the same thing are cylindrical structures made up of concentric tubes called Lamela. So kind of imagine a big tree with its rings and you have these rings of tubules, the Lamela making up these cylinders and they have a central canal called a perversion canal with the nerves and blood vessels running through it. When we think about our types of bone tissue, we're thinking about spongy and compact bone and trying to figure out which one has the osteon in them. Well, the name can remind us spongy bone obviously looks spongy. It has more of a lattice type structure. Compact bone looks very dense and solid. So it's compact bone choice. A that has the osteon, that's what it's made up of and that gives it its smooth appearance. Spongy bone has that completely different type of structure, the network or lattice of these very small little bits called trabecula. And there's some tiny little capillaries running through there. And then the space, the spaces in that lattice work are filled in with bone marrow. So it's only choice. A compact bone, not spongy bone. And then we can eliminate answer choice C which is both and answer choice D which is neither our answer is choice A for the type of bone tissue containing those osteon or aversion systems. Just the compact bone. See you in the next video.