Name: Rotator Cuff and First Exercise Graph: Video #9 of Introduction to Functional Anatomy
Uploaded: 2023-04-26T01:00:15.000Z
Duration: 15 min 34 s
Description: Learn the functional anatomy of the rotator cuff muscles in this educational video from the Brookbush Institute. Learn about the suprapsinatus, infraspinatus, teres minor, and subscapularis, the joint actions they will perform, and how muscles work with other muscles at the shoulder. Great for students looking to deepen their knowledge of functional anatomy.

English captions

https://stream.mux.com/rtiQfe02MYfYxZyJnBJf2GoVqdaTyJe00yjt9lrN9HpJM.m3u8

Learn the functional anatomy of the rotator cuff muscles in this educational video from the Brookbush Institute. Learn about the suprapsinatus, infraspinatus, teres minor, and subscapularis, the joint actions they will perform, and how muscles work with other muscles at the shoulder. Great for students looking to deepen their knowledge of functional anatomy.

Introduction to the Rotator Cuff and Its Muscles

Detailed Anatomy of the Rotator Cuff Muscles

Function and Joint Actions of the Rotator Cuff

Muscle Fiber Types and Their Role in Shoulder Stability

Consequences of Neglecting Rotator Cuff Training

Training Tips for Rotator Cuff and Reverse Fly Exercises

Rotator Cuff and First Exercise Graph: Video #9 of Introduction to Functional Anatomy

How many of you have heard of the rotator cuff before? A few people? We got this and one graph and we'll go to lunch, sound like a plan? Your rotator cuff muscles, they're your SITS muscles. How many of you have heard that? This creates a little acronym for you to memorize the rotator cuff muscles by and if you memorize them in this order, it does help. It does help, I'm going to show you how you can make this... becomes a graph that's really easy to remember. First thing you have to remember, unfortunately, is the names. Supraspinatus, Infraspinatus, Teres minor Make sure you know teres minor. Subscapularis. Now I remember the first time I learned these muscles. The names kind of freaked me out. Supraspinatus, sounds like a dinosaur. The supraspinatus. No? Maybe I took that a little too far, but nonetheless these names do tell you where the muscles are located. Remember I said anatomy is just another language, so let's break this word down. Supra sounds like what? Superior. Spine, spine, what bone are we on? Scapula. Does the scapula have a spine? It does. The origin of this muscle is the supraspinous fossa. What's what's the layman's term for fossa? Who wants to come up with it? We got "bone bump" for tubercle and tuberosity, I like that. What's a fossa? It's not a hole. A foramen is a whole. A fossa is a depression, an indent. This depression right here is the supraspinous fossa, which just happens to be superior to the spine of my scapula. Makes sense now right? Your supraspinatus runs in here, goes underneath your acromion process and it attaches into the greater tubercle of the humerus by running across the top of the humerus. If it goes from the top of the scapula, on top of the humerus, number one, what joint are we talking about? Shoulder. So we're still using the same word bank. That hasn't changed. We're still talking about the shoulder. We're still using the same word bank. If it goes from the top of the scapula to the top of the humerus like that, what do you think it's going to contribute to, join action wise? It does one of these puppies. It contributes to... especially the initial part of abduction, this is an abductor. Infraspinatus is in the infraspinous fossa, what was the fossa again? Indentation. Infra probably sounds like inferior. Spine, spine. This actually has some of the origins and insertions, you can come up here on your breaks and lunch and look at some of this. The infraspinous fossa is all this. The infraspinatus goes from the back of the scapula to the back of the humerus. What's it going to contribute to? External rotation. Teres minor, I don't know if you can see this. This is probably easier way to look. Can you see how the teres minor and the infraspinatus kind of blend? The teres minor definitely comes off the lateral border of the scapula, it doesn't go all the way over here like the infraspinatus does but they kind of blend and go in the same direction, which means they probably contribute to what? The same joint action. They're both going to do external rotation. I'll give you a little cue for your tests, if you remember your rotator cuff as your SITS muscles, as we're doing up here. IT externally rotates. You with me? IT externally rotates, which only leaves us one muscle. Subscapularis. What does sub mean? Below. What's weird about this picture right here? You see the bottom picture that points the subscapularis? What's different about that picture than the one above? It's an anterior view, which means who's missing? Scapula is there. The ribs. I heard somebody say it. The ribs have been removed from that picture. You are looking at the subscapularis from here. Subscapularis is underneath the scapula, so it goes from the front of the scapula to the front of the humerus. What type of rotation? Internal, right. Now you're on the front, so it turns it this way. Does that make sense? We have the two muscles in the back that pulled us in this way, the one on the top that pulled us this way and then the one in the front that pulls us this way. At least it's on the front of the scapula. A little aside, just to teach you a little bit about muscular function so you understand why you're learning all this stuff. The interesting thing about the rotator cuff muscles is yes, those are the joint actions and they'll actually do some other joint actions as you get more into advanced kinesiology and you start talking about some other things it'll do, but that's not the primary function of the rotator cuff. To call the glenoid fossa, which we were talking about earlier, this part right here, the "shoulder socket" is a little unfair. Why is that? Does that look like a socket to you? Does that look like something the humeral head is just totally buried in? This is what's supposed to be giving our shoulder stability? It would be a better analogy, rather than calling it a ball and socket, to call it a "golf ball and tee" joint. That's about how much support the humeral head has. So who keeps the humeral head on my glenoid fossa? What ends up happening is the rotator cuff comes along and goes "Okay, we'll put one in front like this we'll put a couple around the back, we'll put one on top to make sure we hold you in." From a training perspective, what happens? Well, these muscle fibers for rotator cuff and all of our stabilizing muscles are mostly type one. What are type one muscle fibers? Slow twitch, fatigue resistant, they're our endurance fibers, so how do they want to be worked? Probably a little bit slower, probably a little bit slower tempo, but most importantly for a higher rep range. This isn't our 1-6 rep range, this is our 12 to 20 rep range and if we really want to get sophisticated we'll do 12 to 20 reps at a slightly slower tempo and since we know we're working on stabilization, we'll work on progressing exercises over time to more and more unstable environments, so getting off of machines, going to dumbbells, maybe stuff on a stability ball. You have seen some of the stuff? That's really really important, but how many people do you know, especially athletes, enjoy endurance training? You don't see it very often. What do all athletes want to do? Get big and do power training. They want it fast and hard. That's it. One to six reps, how much can I lift, how fast can I lift it and then I'm going to rest for three minutes. That's great for your prime movers, but who gets left behind? Your stabilizing slow twitch fibers. I will never forget, I used to play ball against this guy in my complex and he used to play Division II ball, guy was probably about 6'6, probably outweighed me by 20...25 pounds. He's up there at around 250 pounds. Dude was a beast. Big boy. Every time I went and played against him "Oh I'm gonna hurt tomorrow." And I'll never forget we played for months and months and months and he happened to actually work out at the gym that I was a trainer at and I would watch him work out a little bit, but I'm not one of those people who's going to come up to you and tell you everything that you're doing wrong or everything that you're doing right, you go and workout. You want my advice you can come up and ask me. But I did happen to notice with this particular guy he spent a lot of time on machines. He could lift a truck, but he spent a lot of time on machines. And then there was a period where I didn't see him for a while. I didn't seem down on the basketball court, I didn't see him in the gym. The next time I saw him, he's in a sling. I'm like "Dude." I know what he could do to me, I'd hate to see the guy who could do that to him. That was my first thought, but then I went over and asked him, "What happened" and he said, "I threw an outlet pass." I went, "What?" You know what an outlet pass is? He's a big enough guy, he can take a basketball and do this and just chuck it. He said he literally went like this and dislocated his shoulder. So what had happened? Right. I'm starting to put all this together, he's been working his prime movers, getting huge, but his poor rotator cuff is not getting any of the work it wants. It's not getting fed the way it wants. I guarantee this is what happened when he threw that ball. He saw that outlet pass, knew he had to make it quick and powerful, probably B-line it, so he could get it there on time. His prime movers pulled on his humerus as hard as they can and his rotator cuff went, "Yeah, screw this." And he dislocated his shoulder. That's how that happens and meanwhile all he really had to do with some stability work. It's not like he needed to be any bigger to play basketball. Six foot six, 260 to play rec ball, you're big. Do a little stability work he wouldn't have ended up in a sling? Does that make sense on how the rotator cuff works? Do you understand why you need to know your functional anatomy a little bit too? Let's do this one graph, reverse flye. Yeah, like a seatbelt. I like that, rotator cuff is kind of like a seatbelt. Reverse flye. Your reverse flye, all you are going to do is fill it in just like you filled in that graph. You're going to fill in, what plane of motion is a reverse flye in? Transverse, good. We'l do this one together since you haven't done one of these yet. We're going to do quite a quite a few of these graphs. What joints are involved in a reverse flye? My shoulder joint and if my shoulder is involved, who else is going to be involved? My scapula. Those move together. Anytime you write shoulder on any graph that we do, you need to right scapula too. I want you to think about them as two separate joints though. You don't write those in one box, but anytime you have shoulder, you're going to have scapula. So shoulder, what joint action is occurring at the shoulder? Horizontal abduction. Then we'll go down to our next box and we have scapular retraction. I have shoulder abduction, what muscle is responsible for short of shoulder abduction? It's a muscle that we've gone over to this point. Posterior deltoid, good. What muscles are responsible for scapular retraction? Rhomboids and mid-traps, we've already done that one before. That's the nice thing about learning these graphs, is anytime scapular retraction comes up, who's involved? Who causes scapular retraction? Rhomboids and mid-traps. If I say scapular retraction for a seated row, what muscles are responsible? Rhomboids and mid-traps. If I say a bent over barbell row with scapular retraction, scapular retraction is caused by...? Rhomboids and mid-traps. Got it?

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Functional anatomy of the rotator cuff. Joint actions, location, pictures, and exercises for the supraspinatus, infraspinatus, teres minor, and subscapularis a.k.a. rotator cuff muscles. 

Rotator Cuff and First Exercise Graph: Video #9 of Introduction to Functional Anatomy

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