in this video we're going to give a brief overview of joints joints otherwise known as articulations are basically sites in the skeleton where two or more bones are going to meet so they are not made up of oous tissue it's a different type of tissue that makes up joints and so joints serve two main functions number one to hold bones together so to hold the SK skon together but because they are not oous tissue they represent the weakest component of the skeleton and the one part that is most likely to get damaged additionally joints serve to facilitate the mobility of the skeleton so we can classify joints based on their function so what type of movement the joints allow or we can classify them based on their overall tissue and relative structure so what material we're using or whether or not the joint cavity is present or a joint cavity is present or absent so let's look at the functional classification so we can look at the root words because a lot a lot of these words are really uh complicated really long words but the root word arthro so we're going to write that over here arthro refers to Joint so synarthrosis amphiarthrosis diarthrosis these are all referring to different types of joints the rest of the phrase Sy YN here or ampy here or die here Sy YN means together so these are basically joints where the bones are held together and these are going to be immovable joints with regards to amphi ampi means on both sides so you can think of like an Amphitheater it's kind of like this u-shaped uh region surrounding the stage so you have spectators on both sides so this refers to joints that have some uh capability of movement and then lastly dioses so D is going to refer to through or apart meaning that the two bones that form that articul ulation site or the two or more bones that form that articulation site are able to move past each other so diarthroses usually refer to freely movable joints now we're going to focus more on the structural component by examining the different types of tissues present and we'll go into a little bit more detail for each of these three categories so first one are the fibrous joints so both the fibrous and the cartilagenous joints they [Music] lack a joint cavity the only one that has a joint cavity are the sinovial joints so when we look at the materials Binding Together fibrous joints are joined by fibrous tissue so this is usually going to be dense connective tissue cartilaginous joints are usually going to be dominated by cartilage and again sinovial joints are significantly more complicated so we'll spend an entire video overviewing those particular joints so we could also see the location of these various joints the fibrous joints so the ones that um in general they don't have a lot of movement uh actually they tend to be immovable joints these are going to be found primarily in the axial skeleton uh you also will see some cartilagenous joints there with some limited Mobility the sinovial joints are going to be found in the upper and the lower arms where you have a lot more uh Mobility so covi joints tend to be freely movable joints while the fibrous and cartilagenous Joints tend to be immovable or slightly movable joints