Name: Joints of the Shoulder Girdle and Scapular Joint Actions: Video #6 of Introduction to Functional Anatomy
Uploaded: 2023-04-26T01:00:51.000Z
Duration: 13 min 28 s
Description: Learn the functional anatomy of the shoulder girdle joints in this educational video from the Brookbush Institute. Learn about the joints of the shoulder girdle, scapular joint actions, and how these joints contribute to shoulder movement. Great for students looking to deepen their knowledge of functional anatomy.

English captions

https://stream.mux.com/k02wBKk3iF7nPf11F9I2U01DCHrlRQ6FfcjOnVqXEv4ik.m3u8

Learn the functional anatomy of the shoulder girdle joints in this educational video from the Brookbush Institute. Learn about the joints of the shoulder girdle, scapular joint actions, and how these joints contribute to shoulder movement. Great for students looking to deepen their knowledge of functional anatomy.

Understanding the Shoulder Girdle Joints

Scapular Joint Actions in Motion

Exploring Scapular Movements: Protraction and Retraction

Advanced Scapular Actions: Anterior and Posterior Tipping

Joints of the Shoulder Girdle and Scapular Joint Actions: Video #6 of Introduction to Functional Anatomy

So let's talk about joints of the shoulder girdle. We just learned all these joint actions and now I'm going to throw a little wrench in our joint actions chart, but joint actions of the shoulder girdle are acromioclavicular joint and our sternoclavicular joint. Now those sound like really huge, technical words, well remember when I was talking about anatomy being another language, those aren't huge technical words, they're actually referring to two specific bones or two specific points with on a bone. Your acromioclavicular joint everybody feel this right here, feel that shelf where you don't have any de ltoid, it's just above your deltoids, it doesn't matter how big your deltoids are you still don't have deltoids here. Right here you feel the shelf, well that's part of your scapula called your acromion process. What's this bone right here called? This is your clavicle, your collarbone it's your clavicle, so where your acromion process and your clavicle meet is called your acromioclavicular joint. That's it, it's not so bad right. It's like when you try to smash words together, you guys ever do that, like you see a cute couple and you like try to smash the girls name and the guys name together, you guys ever done that before? Right don't they do that with like stars, huh Kimye, awful, terrible. Anyway, but you get what I'm saying, that's all they've done here, taking acromion and clavicular and said, "You know what'd be really cute? If we call it acromioclavicular." That's the name of the joint, for short it's AC joint. Sternoclavicular, what do you think sterno is related to? Sternum and the clavicle feel right here, do a little of this, you can kind of feel there's a joint right here. The funny thing is is your entire shoulder girdle including your arm, the only bony attachment to your body is this joint right here. Craziness. That's crazy. Alright so that's your sternoclavicular joint. Now although those are the two joints of the shoulder girdle, we don't usually refer to motion of these joints. In further classes you will, those of you guys going back for your ATC, your DPT, master's in kinesiology, you'll start looking at these joints specifically, but for the most part those two joints help to dictate motion of the scapula, and we refer to motion of the scapula in analysis. Most of the muscles that would even impact these joints are actually attached to the scapula, does that make sense? So I don't want you guys to think that the scapula is a true joint, sometimes it's called the scapulothoracic joint. It's not actually a true joint, it's just more convenient to label it that way. Now unfortunately you guys just learned all of these joint actions right, flexion, extension, abduction, adduction, horizontal abduction, adduction external internal rotation, lateral flexion, you learned all that. The scapula doesn't use those, so we have to learn a separate set of joint actions. You ready? They're actually not that bad. Most of them occur in the frontal plane. Does anybody want to take a wild guess why most of them would occur in the frontal plane? Think about how I taught you guys the frontal plane. The muscle, the way the muscles run, that's part of it. I told you to think about the frontal plane as if you had what? A plane of glass in front of you. What's in front of the scapula? The ribs. Is there going to be a whole lot of sagittal plane motion of the scapula with ribs in front of it? Now that kind of makes sense. So our frontal plane joint actions, our scapular joint actions rather start with, that's my scapula everybody cool with that, all right start with this. If I go up it's called elevation, because elevators take you up, I know they can take you down too but stay with me. So elevation is up, that makes sense right that's not too bad. What do you think the opposite of elevation is? Depression. Don't most people who are depressed kind of have their shoulders down anyway. Okay so we got elevation, we have depression. The next joint actions you kind of have to think of the scapula as a pinwheel. You remember pinwheels? They were these little, there was like a stick, stick, right then they had these like leafy things, how's my art coming? Is it getting better? Better than the horizon, that kind of looks like a pinwheel and you'd like blow on it and it would spin, you know what I'm talking about? Or am I just totally dating myself at this point. Pinwheel? You have to kind of think of it as a pinwheel, it's a type of rotation although it's a rotation in the frontal plane this way, known as upward and downward rotation. Now to decide which way is up and which way is down we need a point of reference, you with me? That point of reference for the scapula is your shoulder socket, this part where my humerus hangs down my arm, this is known as your glenoid fossa. When your scapula spins so that we end up with glenoid fossa pointing upward, which rotation do you think that is? That's upward rotation, moving back down is going to be downward rotation. What do you think we see these joint actions, anybody want to take a guess? Frontal plane motions sure, give me an exercise? Shoulder press would be what? Upward rotation, when would I see downward rotation? Pull up, so if I'm doing a pull-up, my scapulae are starting to do this, which is that downward rotation. Has everybody got that visualized? Alright let's talk about the last ones. If I drew you from the top, this is your torso this is your head, sorry if any of you are offended by this picture I don't mean anything by it, not that big, it's my torso. So we got torso head and then we got scapula, it's a great picture isn't it. If I do this, all right if I do this thing, so in essence I go from here to here, can you see how that would be transverse plane movement? Parallel to your table since this is a top-down view. Now the question is what do we call that? This is protraction. How many of you have seen this guy in the gym, you can now refer to them as Captain Protraction. No? None of you are that nerdy? Any of you know what ILS stands for? This is a good one too, you don't know ILS? "Imaginary Lat Syndrome." You can throw that around amongst yourselves. So protraction, what action, what exercise might we see a little protraction in? Benchpress sure, we really need protraction to bench pres. In fact, anytime we do pushing motions, we need some protraction. What's the opposite of protraction? Retraction, so that's when my scapulae actually come closer together and almost touch in the middle. We got the green as protraction, when we got red we got retraction. Those six joint actions are your big joint actions for the scapula, those are the ones you will see most often, you guys cool with that? Now there is two other joint actions for the scapula that you don't run into as often in your textbooks. Those of you who continue with my courses you're going to have to be aware of, which is there is one set of sagittal plane motions for the scapula. It's called anterior and posterior tipping. So we won't refer to this too much for the rest of the day, you can put a little star by this, as bonus material, but if I drew a skeleton from the side, all this are my vertebrae, how you like my picture? Good. Scapula sits just like this. Now anterior and posterior tipping is sagittal plane motion, which means it's in which direction? Forward and back right? So what happens with the scapula is it can kind of crawl over the top of the rib cage, and it can tip anteriorly. Alright so when we refer to this tipping it's in reference to the top of the scapula, and then what would be the opposite of anterior tipping? Posterior tipping, exactly. So that would be posterior tipping. When we get into a little bit more complex postural dysfunction and correcting postural dysfunction and improving mechanics of the the upper body, this becomes important. Everybody's got those? Anybody want to take a guess when anterior and posterior tipping happens, like some exercises? Shrugs, yeah you don't really force it in a shrug. It's probably going to be more like an arm motion that anterior and posterior tipping gets included in, anybody want to guess? Swimming possibly, when during the swim? So if I do this, what's going to happen to my scapulae? They're going to posteriorly, do it, do it, you can feel your scapulae push into your rib cage, it flipped this way, so that's posterior tipping. Anterior tipping is, yeah if you did one of these things, everybody do this, because it looks hot, like Kimye, this is anterior tipping. Everybody's got their scapular motions down.

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Joints and joint actions of the scapula and shoulder girdle. Description of the scapulothoracic (ST), sternoclavicular (SC), and acromioclavicular (AC) joints and the scapula, joint actions/motions of retraction, protraction, elevation, depression, and upward and downward rotation. 

Joints of the Shoulder Girdle and Scapular Joint Actions: Video #6 of Introduction to Functional Anatomy

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