In this video, we're going to introduce our map of the lesson on joints, which is down below right here. And because this is a map of our lesson, it is essentially a table of contents that you can continuously use to help guide you through our lessons on joints. Now, as we move forward in the lesson, we will also double click to expand and compress portions of the map in order to make this map even more relevant to you as we move forward. Now, the way that we're going to follow this map is from a top to bottom approach, but also from a left to right approach. And so, notice at the very top of the map we have the introduction to joints, which is where we currently are in the lesson.
And moving forward, we are going to cover the functional classes of joints. And as you can see here in this map, there are 3 functional classes of joints. And they are the synarthroses, the amphiarthroses, and the diarthroses. Now, one thing to keep in mind here is that moving forward in our lesson, we are going to use these symbols to represent each of these functional classes. And so, as we'll learn moving forward in our course, the functional classes of joints are categorized based on the amount of movement or the amount of mobility that the joint allows for.
And so, synarthroses are actually immovable joints that do not allow for any movement. And because that's the case, notice that the symbol does not have any movement arrows going around it. Now, the amphiarthroses, as we'll learn moving forward in our course, actually allow for a little movement. And because that's the case, notice that the symbol we use has one movement arrow going around it to remind us that amphiarthroses have a little movement. Now, the diarthroses, as we'll learn moving forward in our course, allow for dynamic or free or large range of movement.
And because that's the case, notice the symbol that we use has multiple movement arrows going around it to represent that dynamic movement of these diarthroses. And so, once again, moving forward in our course, we will utilize these symbols to represent each of these functional classes. Now, what you'll notice is moving forward in our course, we will then cover the structural classes of joints. And notice that there are also 3 structural classes of joints, which are the fibrous joints, the cartilaginous joints, and the synovial joints. And so, notice that there are multiple fibrous joints that include sutures, gomphoses, and syndesmoses.
And what you'll notice is that the sutures are going to be categorized as synarthroses because it has the red s symbol around it. And so, what this means is that the sutures are immovable joints that don't allow for any movement, as we'll learn moving forward in our course. And the same applies for the gomphoses. The gomphoses are a type of fibrous joint that is also categorized as synarthroses because again, it has that red s symbol around it. However, notice that the syndesmoses have the blue a around it, and so it is categorized as amphiarthroses.
Meaning, it allows for a little movement, as we'll learn moving forward in our course. Now, when it comes to the cartilaginous joints, there are 2 types and they are the synchondroses and the symphysis. Now, the synchondroses are categorized as synarthroses because again, it has that red s around it. Meaning that it is going to be an immovable joint that does not allow for any movement. And then the symphyses have the blue a around it, which means that they are categorized as amphiarthroses, meaning that they allow for a little movement.
And so you can see how the functional classes of joints overlap with the structural classes of joints in that fashion. Now, when it comes to the synovial joints, it turns out that they are all categorized as diarthroses, meaning that they allow for dynamic or a wide range of movement. And so what you'll notice is that we've got different types of synovial joints listed here, including plane joints, hinge joints, pivot joints, condylar joints, saddle joints, ball and socket joints. And notice that all of them have this symbol here that represents the diarthroses. And so, moving forward in our course, we'll be able to again utilize these symbols for synarthroses, amphiarthroses, and diarthroses, and we'll be able to learn a lot more about each of these different types of joints.
And so this here concludes our brief lesson on the map of the lesson on joints, and I'll see you all in our next video.