Rotator Cuff Tutorial – Anatomy Tutorial

Rotator Cuff Tutorial – Anatomy Tutorial

This is a tutorial on the rotator cuff. The
rotator cuff are a group of muscles which are important in supporting the glenohumeral
joint. They are important in shoulder movements and maintaining stability of this joint. So
if we just have a look at the glenohumeral joint over here, you can see that the head
of the humerus sits in this very shallow glenoid fossa. So the shoulder joint essentially sacrifices
stability for mobility. So the rotator cuff muscles are a group of muscles that originate
on the scapula and insert onto the head of the humerus and provide stability across this
joint. So I’ve just added in the muscles here and we’ll just take a look at the muscles
that make up the rotator cuff, and a look at their function. So this big muscle sitting
over here – so we’re looking at a lateral view of the left side of this model. So this
is the big, powerful deltoid muscle. I’ll just get rid of that so we can have a good
view of the rotator cuff muscles. And then we’ve got the trapezius here, so I’ll get
rid of that as well. And we’ve got the powerful pectoralis major here. So just having a look
at the rotator cuff muscles now, there are four rotator cuff muscles and you can remember
them with the acronym SITS – S I T S. So “S” is Supraspinatus, “I” infraspinatus, “T” teres
minor, and the final “S” is subscapularis. So we’ll just work our way through those muscles
to begin with. So the supraspinatus is this muscle which sits at the top of the scapula,
so if you think of the name “supraspinatus”, “supra” means “above”, “spinatus” refers to
the spine of the scapula, so it’s sitting above the spine of the scapula which you can
see here. So this is the supraspinatus. And if we look at where it inserts onto the humerus,
you can see that it attaches superiorly on the head of the humerus, on the, at the top
of the greater tuberosity. So if we just imagine this muscle contracting we can see that it
will bring the humerus up in this kind of motion, so it will abduct the arm. So the
supraspinatus is responsible for the initiation of abduction, and the supraspinatus is innervated
by the suprascapular nerve. So the next muscle we’re looking at is this one here, the infraspinatus,
and again this sits below the spine of the scapula – so “infra”, and “spinatus” referring
to the spine, so “infraspinatus”. And this muscle attaches slightly inferiorly and posteriorly
on the greater tuberosity of the humerus. So again it’s always useful to try and think
logically about how these muscles act if they contract, rather than just memorising different
functions of muscles. So just looking at where it inserts, you can see if it were to contract,
it would pull the humerus round in this way. So it would externally rotate the humerus
– you can see that by the position of where it inserts. So this muscle inserts on the
posterior facet of the greater tuberosity slightly inferiorly and posteriorly to the
insertion point of the supraspinatus. So that’s the infraspinatus. And then we’ve got the
teres minor here – this is the third rotator cuff muscle and this has…you can see by
the same, by the point of insertion slightly inferiorly to the infraspinatus you can see
that it will also have the same action, so that it externally rotates the humerus. And
the teres minor is innervated by the axillary nerve. So I’ll just get rid of this muscle
quickly, so you can actually have a look at where it sits on the scapula. So you can,
I don’t know if this is the best illustration, but the teres minor originates on the middle
half of the lateral border of the scapula, and if we remove this muscle, we can see the
teres major, which isn’t a rotator cuff muscle, but which lies just beneath the teres minor
– so I’ll just bring that back. There we go. Okay, so the last muscle of the rotator cuff
is the subscapularis, but unfortunately it isn’t actually included on this muscle, but
the subscapularis as the name suggests lies underneath the scapula. So if I were to remove…it
literally lies on the underside of the surface of the scapula, so you would ordinarily be
able to see it from this view, sitting under the scapula, and this muscle, if I just get
rid of the biceps, this muscle would come round from under the scapula to insert on
the lesser tuberosity of the humerus. So whereas the infraspinatus and teres minor insert on
the greater tuberosity and cause external rotation of the humerus, the subscapularis
inserts on the lesser tuberosity here. So if you can just see this sort of lump here,
that’s the lesser tuberosity of the humerus, and that’s where the subscapularis inserts.
So it internally rotates the arm, so it brings the humerus round this way – medial rotation.
And the subscapularis is innervated by the upper and lower subscapular nerves. So those
are the four muscles of the rotator cuff. And the rotator cuff muscles are an important
set of muscles to know about because they’re quite frequently injured, you can get tears
in the actual muscle itself, or you can get damage to the tendons. And injury is quite
commonly seen in people who have a job, or hobby that involves a lot of throwing. You’ll
see it in people who go to the gym a lot and bench press, so it’s quite a common source
of… So yeah, a common source of shoulder pain is often related to the rotator cuff
and you’ll come across something called impingement syndrome, so this is where, or shoulder impingement,
so the name quite suggests the cause of the pain, so you get impingement of the tendons
as they run under this subacromial space. So this acromion process of the scapula sticks
out here, and you’ve got the tendons – so you can see the supraspinatus tendon running
underneath this space, and if this space is narrowed for any reasons, so for instance
in osteoarthritis you get bony outgrowths, osteophytes, and they narrow the space where
this tendon runs and put pressure on it and cause a lot of pain, they cause weakness,
and a loss of shoulder movement. So that’s a particular condition to be aware of. So
that’s the rotator cuff muscles – four muscles, remember it by the acronym “SITS”: supraspinatus,
infraspinatus, teres minor, and subscapularis. And if you try and remember the points of
insertion you can relate that to the function. So the supraspinatus initiates abduction,
the infraspinatus externally rotates, and so does the teres minor, and the subscapularis,
which inserts on the inferior…on the lesser tuberosity, causes internal rotation. So that’s
the rotator cuff.

100 Replies to “Rotator Cuff Tutorial – Anatomy Tutorial”

  1. Outside of the missing view of subscapularis, this works perfectly for me. I finally know it "by heart," since I now actually understand. Well done educating.

  2. Because of two shoulder replacements I've been looking for clear understanding of the shoulder. For me,This one has been the best by far.

  3. can i convert your videos in bangla language. i would be very helpful to bangladeshi student or please dubbed those on bangla.

  4. What it's Supraspinatus does for the body/arm. I have a very painful/tender area right surround that Supraspinatus tendon and upper bicept tendons. I could move my fingers, my wrist and my elbow.But, No way I can raise my arm. Very painful and debilating. Could this be an fnfamation or or tendor rupture? I have severe CIPRO attack last year.

  5. Ive had this injury for 7 months. Going to Physio for 2 months, no results. I cant even sleep on my shoulder.

  6. Rotator Cuff Tutorial – Anatomy Tutorial
    The ultimate home study course on human anatomy & physiology. ………………………………….

  7. Great! Very helpful Just the right level of complexity for me as a yoga teacher. Pity there was a bit missing from the model, but the point about thinking about the insertion of the muscles and not just trying to memorise the names was very well made. Thanks.

  8. is it possible that training these outer rotator cuffs can actually pull your scapula forward? if the overall shoulder joint is very very tight? i have had shoulder surgery almost a year ago and i feel like my rotator muscles are pretty strong, but my scapula is in a pretty bad position. could it be that those muscles are too tight? sorry for these weird questions 🙂

  9. This is one of the most concise description of the anatomy and kinesiology of the rotator cuff I have previewed!

  10. great visual way to explain!
    3D view! i always wanto know how it really looks like. But not just from one thing like skeleton Or muscles. and illustrations oversimplify.
    If you could also Animate it in see how the muscles stretch or tighhten in the movements. Like when you rais ur arm and such

  11. how can i play around with the skeleton and the muscles like he is doing on the video ? or does anybody know of any tips or pointers to teach me how to improve on my anatomy any games or online websites that worked well for anyone in the past? any suggestions will be appreciated .

  12. Hi my name is DR. Maryam Samee, niece of Dr. Najeeb who is my uncle and I am 5 years old. I love your videos. I think they r awesome 🙂

  13. stumbled on your chanel by coincidence as i was browsing for anatomy videos. ..and by far you're one of the clear straightforward to.the point in the matter …kepp on the good job sir

  14. 1 million more views than usual because 1 million people hurt their rotator cuff. WHY YOU SO FRAGILE, ROTATOR CUFF

  15. i went the gym and did a hard benchpress. i didnt even know what happend i didnt feel anything about it but next day i woke up with a shoulder pain. i reseaech all the things about it. than i realize that i can adducting, internal rotationing bur i cant external rotation. so i watched this video and i learned the external rotation muscles from you. now from my researchs i learned ice press to shoulder between 3-4 hours. i’ll do it 10 days and than if it can’t fix it i’ll go to a doctor and say to him “i have injured in bench press and i cant external rotationing so i think i have an injure on teres minor or infraspinatus or posterior deltoid.” sorry for my language i m not good at english 🙂

  16. Haha when he said ppl who bench press start to feel pain in the shoulders I was like yep that's me. After about 2 weeks of rotator cuff work I'm almost pain free!

  17. What program did you use to create this video? I need to create a video very similar to this but, with different structures and explanation of a several pathologies. Any help is appreciated

  18. Dear Anatomy zone can I suggest a better software for your youtube anatomy videos as some bone surface markings and muscles origins and insertions are not clearly visible such as the subscapularis muscle on this video. I think complete anatomy by 3D4 medical is by far one of the best apps to consider (

  19. here's several things for diy table saw construction
    Find a suitable set of plans online
    Find a colleague who wants to build one too so you have another person to help you
    (I discovered these and why they work on Wilfs wood blueprint website )

  20. You are a lifesaver for my anatomy class, my professor went very quickly over the slides rather than explaining it . Subscribed you and liked your lectures!!!

  21. thank you very much for this. I must say our creator f'd up when he created the shoulder joint. Too prone to faults, injuries

  22. Those 233 who gave a thumbs down, thought they were gonna see a nude body and got disappointed. Cant think why else anyone would give a thumbs down for this video.

  23. I read ..rotater cuff muscle important to support & share of stabilzing of the shoulder joint ……..what is the meaning of stabilizing ???

  24. how would it be possible i would be able to stick out my scafula blade since im a kid im 40 now would you know the reason cause ive never seen it don?

  25. Thé úĺtíḿátéé hőḿé śtúdӳ ćőúŕśé őń húḿáń áńátőḿӳӳӳ

  26. What do you do if you have already badly damaged your rotator cuff once already and the second time is worsened,and you habe alot of pain. 😭 #imaawimp. 🙄.😭😭😭

  27. it's from your fucking phone, especially when laying in bed at night, holding it. Put the fucking phone down for a week, see if the pain goes away. You're holding your arm like a special ed t Rex for hours, under tension, and it doesn't hurt because the internet is pumping you with dopamine…doesn't hurt until you try to use your arm for other stuff, or put it down by your side. The nerves and muscles actually shorten over time, when your arm is down at your side the nerves get put under tension, arm down is no longer the neutral position…

  28. You didn't mention something and its quite important which is the spaces between these muscles of the rotator cuff there are three spaces it's really important to mention

  29. Finally I've been enlightened about the anatomy and function of the rotator cuff. I've read about it in books and articles but just never had a good understanding until now. Thanks!!

Leave a Reply

Your email address will not be published. Required fields are marked *