hello anatomy friends this is dr alsup and welcome to your second lab visit and we are
starting off with station number one in this specific lab visit we're going to focus on
the appendages so not only the bones but also the joints and the muscles that will make up
these fairly complex regions of the body so station one we are focusing on the bones of
the pectoral girdle which are the clavicle and the scapula so you can see in this anterior view
here we go i thought it was going to let me write but here we go so clavicle
is this we colloquially refer to as the collar bone the strut like bone right here and the
scapula as you can see here you can see a much better view of the scapula on a posterior view
of the thoracic cage with a little bit shorter view of the clavicle here
so let's start with the clavicle first the clavicle is going to have a shaft that has
this kind of double curvature associated with it and it will have two ends that i hope that
you will be able to identify the first is going to be the sternal or the medial
end and this is going to be the more enlarged and it looks a little bit more bulbous to me
and it is going to articulate with the manibrium right here at the clavicular
notch and this forms the sternoclavic joint the acromial end or the lateral end of the clavicle
is a bit more flattened or kind of tapered off in comparison to the more bulbous sternal
end and this is going to articulate with the acromion of the scapula
now looking at an individual scapula this is going to be an anterior
view and this is going to be a posterior view and the reason that i know this is
posterior is always very easy for me to be able to identify because it has this very prominent spine
that is going to be running along the more superior portion of the bone so this is
the spine of the scapula and it will continue laterally and it will flatten and actually expand
in terms of size as the acromion and sometimes you hear this referred to as the acromion process
and this is what is articulating with that acromial end of the clavicle
oops excuse me you can even see a little bit of the acromion right here on this anterior view
what's clearer on the more anterior view which you can only see a little bit of right here is
the coracoid process which is supposedly kind of this beak-like shaped structure
it will be found superior to the glenoid cavity which will be right here we'll see
a better view of that in a moment and it's going to project anterior laterally so i always think
of this as like almost like a bent finger that is pointing toward the shoulder joint and lots
of things are going to attach here you're going to have ligaments that are associated with the
both the shoulder joint and the chromio clavicular joint as well as muscles like the pectoralis minor
and the short head of the biceps brachii will have an attachment on this coracoid process
now looking at a lateral view of the scapula the dominant structure here is the glenoid
fossa sometimes you hear this referred to as the glenoid cavity you'll hear it either way either
one is correct but this glenoid fossa is always facing laterally because it needs to articulate
with the lateral humerus and this is going to be the socket portion of that glenohumeral joint so
you can see how relatively shallow this area is in comparison to the head of the humerus
which is considerably larger not allowing for a particularly great fit between the head of the
humerus and the glenoid fossa you can see a little bit of the you can see the coracoid process here
and the acromion right here on the because as these are more superior structures
all right so those are the main structures that i want you to be able to identify on the clavicle
and the scapula we are going to continue our tour moving distally in terms of the bones of
the upper limb as you review please make sure to and always feel free to reach out
with any questions early and often thanks for your time and attention here have a great day