Muscles that move knee

Muscles that move knee



okay we are now down to muscles that move the knee joint so the muscles that move the knee joint they are going to be crossing the knee joint and have action at the knee joint remember the knee joint we are basically going to be talking about flexion and extension so we're going to start with the extenders of the knee joint and those are the quads so for you all you have to know is the extenders of the knee are the quads how many quads do we have four quad is four so let's get rid of remember that's your Sartorius we're going to get rid of Sartorius so here are your what what's the action of these guys these are your adductors right and these are going to be your your knee extenders your quads so let's just start from the most lateral here's lateral here's medial this one on the lateral side guess it's named vastus lateralis and let's add them all together and then here we have our rectus femoris remember we talked about rectus femoris before has a hip flexor it's the only quad muscle that crosses two joints it crosses the hip joint and the knee joints so it's going to have action at the hip and knee the rest of the quad muscles do not cross that hip joint and then we're going to have vastus medialis the medial muscle and if we fade oh it's fade fade these guys if you fade them this guy deep to them deep to rectus femoris is going to be vastus intermedius so let's do one muscle at a time let's just go back oops how do I do that hmm Oh let me stop and figure this out let's get back get rid of Sartorius again let's get rid of Sartorius and let's just look at the vastus lateralis isolate this guy out so its origin is up here by the greater trochanter so it is not crossing the hip joint and remember all the quad muscles are inserting into the tendon here the quad tendon that's going into the patella and then we're going to have a patellar ligament that's taking all the quad muscles essentially to the tibial tuberosity so this is the tibial tuberosity is where all the quad muscles are ultimately inserting so they're going to be pulling the tibia from here so that's why you have such a big tibial tuberosity because all the quad muscles are inserting right here so that's the vastus lateralis only crosses the knee joint we've done the rectus femoris it's inserting up up here on the pelvis so it's crossing the hip joint and the knee joint so it's having hip flexion and knee extension and if we do the vastus medialis on the medial side we see it does not cross the hip joint either it's inserting up here on the femur and it is also its origin is up here on the femur excuse me and it is also inserting down in the tibial tuberosity via up the patella ligament they're not showing it here but all the quads insert via tibial tuberosity via the patellar ligament and the last quad muscle those were three is going to be deep to the rectus femoris so if we hide the rectus femoris here is vastus intermedius we isolate him we see he also does not cross the hip joint his origins up here on the femur and like all the other quads he is inserting on the tibial tuberosity via the patellar ligament so those are your four quad muscles so as far as you guys need to know the quad muscles all do knee extension the rectus femoris crosses two joints so it's having action at the hip joint also hip flexion and they are all inserting into the tibial tuberosity via the patellar ligament so these are the knee extenders so if these are any extenders were would be expect to find knee flexors the opposite action so they're going to be on the back side and guess what they are the flexors are going to be your three hammies remember this guy your BFF your biceps for Morris on your debut left side pu la la biceps for Moore's next two biceps for Morris is semi tendonosis and deep two semi tendonosis is semi member gnosis so all your hammies are also knee knee flexors knee flexors what else do that all the hammies do they all cross the hip joint remember all the hamstrings are inserting on the let's get rid of this guy they are all inserting on the ischial tuberosity up on the pelvic region so they are crossing the hip joint too so these eyes are also hip extenders they're crossing two joints the hip joint and the knee joint so just remember your hammies cross two joints and they have action at the hip hip extension and knee flexion and you also had some other muscles that we've already talked about that are going to be bending or flexing the knee member Sartorius it crosses it crosses the knee it's also going to be bending the knee so it's it's a knee knee flexor also and gracilis vassilis was one of your adductors but it's also crossing the knee joint so it's going to have an additional action of knee flexion not very strong but it is in that grouping they're all crossing the knee joint so you would say these guys in the front well these guys in the front these are your Nix niets extenders right the quads these guys and back are your knee flexors plus gracilis and Sartorius so hopefully those aren't too bad you've already learned them learn them learn these muscles elsewhere so most of these muscles elsewhere so not too bad big muscles easy to see on your model and pretty easy to see on the cadaver so we'll be looking at these on the cadaver too so next we're going to be looking at the lower limb muscles

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Comments

  1. I’m here cuz my knee hurts from track lol I didn’t know this was a class. What class is it for I’d like to take it maybe

  2. Nothing like a full knee replacement to stimulate quriosity as to where the discomfort comes from. This helps me with recovery. Thank you.

  3. Hii Carla. I have a question to ask. It's partly because of my personal interest in the subject and partly because of a medical condition in family. I would be glad to have a small discussion about the same if and whenever you can spare few minutes. Regards

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