hello all this is dr alsup and welcome to station number five where we are going to
observe the joints in the shoulder region and hopefully we understand that that's not just the
shoulder joint or the glenohumeral joint but also the ac joint or acromioclavicular joint
so real quick before i get into this just looking at this where you mainly just see the
bony structures with a few of the ligaments what view do you think we're looking in
and hopefully you're thinking we are looking at a posterior view and we know that because we can see
the spine of the scapula the spine of the scapula is always posterior and you can see that it is
expanding in this region to form the acromion process or acromion this is going to articulate
with the clavicle to form the acromioclavice joint and this is a plane joint it is very close
to that point of the shoulder and it is going to be superior to the glenohumeral or shoulder
joint which you can see right here so you can see the head of the humerus and the glenoid
cavity or glenoid fossa you can see some of the ligaments in this region as well so this is the
glenohumeral and you can see it is just inferior and a bit lateral to the acromioclavicular joint
here we're looking at an anterior view i know that because i can see some of the coracoid
process right here you see the nice smoother portion of the anterior portion of the scapula i
can see a bit of the long head of the biceps brace brachii tendon right underneath here would be that
inter-tubecular sulcus where that's traveling and so you can kind of see what this looks like with
all the ligaments and the capsules associated with this so you can't really see the glenoid
fossa in this region because the articular capsule is completely surrounding the glenohumeral joint
which would be right here and that's what it looks like you can see how protected this region
is these few things we're not going to have you identify these are ligaments associated with the
ac and shoulder joints but just for kind of for your knowledge but not covered on an assessment
this in blue is going to be the coracoclavicular ligament so if you have a very severe
shoulder separation the cricoclavicular ligament will be damaged this is the ac
ligament and it's really a capsular ligament it's just going to kind of surround the capsule of the
ac joint and this is going to be the correcto acromial because this is the coracoid process
right here remember coracoid process is always anteriorly projecting and this is the acromion
now this is what it looks like with the muscles still intact obviously this is a
pretty deep dissection in order to be able to see portions of the shoulder joint and you can
even see some of the rotator cuff muscles specifically the more anterior one because
we're looking at an anterior view this is this subscapularis and you can see how it's tendon
basically just really starts to interweave and you can't really tell the difference between
the rotator cuff tendon and the actual articular capsule that's what we mean by forming that
rotator cuff around the joint because it's really playing that huge role in terms of stability
you would see the same thing from a posterior view for those other three rotator cuff muscles
this is the coracoid process this is the clavicle this is acromion just to kind of get our bearings
this is where the glenohumeral joint is located and we're looking at the capsule right here one
thing i want you to know and we didn't talk about it in much detail but in the acromioclavicular
joint you actually have an articular disc that is associated with the acromioclavicular joint
similar to what you had in the temporomandibular joint so you do have one in this region as well
and so this is what it looks like more in terms of and a dissection without the dry bone and
this gives you an indication of just how deep you are because we're looking at these fairly large
arterial supply in this region as well all right so that is the acromioclavicular joint and the
glenohumeral joint your most proximal upper limb joints we will continue our uh our tour of the
upper limb with the joints associated with the elbow region thank you for your time and attention