00:01
So, let's start with the clavicle or as some
people may call it the collarbone
but the anatomically correct name is the clavicle.
So, here is the clavicle as we saw previously.
00:13
It is a strange, thin, wobbly bone that extends
all the way from the scapular to the sternum.
00:20
And here, we can see the sternum
where it's attached to medially.
00:23
And laterally, we have the acromion
which is part of the scapular.
00:27
Here, we can see the sternal end of it.
And here, we can see the acromial ends.
00:31
Those named parts associated with the
sternum and the acromion.
00:36
If we then look in the middle of the clavicle,
we see we have the shaft.
00:40
So, we have some key
features of the clavicle.
00:42
Sternal end attaching to the sternum, acromial end
attaching to the acromion and the shaft in between.
00:49
Between the sternum and the clavicle,
we have the sternoclavicular joint
and between the acromion of the scapular and the
acromial end, we have the acromioclavicular joint.
01:02
If we start looking at the clavicle in more detail, we see we have
a superior surface and we have an inferior surface.
01:09
And now, we're going to start looking
at the clavicle's superior surface.
01:14
So, this is if we're looking directly down onto it.
01:17
We can see that medially, we have the sternal
end and laterally, we have the acromial end.
01:24
So, we're looking down on the
superior surface of the clavicle.
01:28
Its medial half is convex anteriorly as you can see
while the lateral half is concave anteriorly.
01:36
And this does give it a characteristic shape and it's quite
difficult sometimes to orientate a left and a right clavicle.
01:44
So, please do try and bear in mind the slightly
dilated acromial end as being the lateral aspect
and then, orientate it so you have
that concavity projecting anteriorly.
01:56
We can also start including some muscle
attachments onto the clavicle.
02:00
And remember here, we're looking
directly down onto the superior surface.
02:05
Sternal end is medial. Acromial end is lateral.
02:08
Here, we can see the bony attachments
for trapezius and for deltoid.
02:13
More towards the midline, we can see the
attachment site for sternocleidomastoid muscle.
02:19
Here, we can see the attachment
for pectoralis major.
02:24
Now, if we rotate the clavicle around, we can still see we have the
acromial end and here, we can see the sternal end.
02:30
But we've flipped it around so we can now
look at the inferior surface of the clavicle.
02:36
Now, we can find the conoid tubercle
and the trapezoid line.
02:40
And here, we have the costal tuberosity.
02:44
I think it's important just to remember
and recognize these bony points,
not get too hung up on what attaches
to them and what their significance
because we'll come back to them
as we talk about the various muscles.
02:56
But bear in mind there are these bony little prominences,
little areas situated on the clavicle.
03:03
Here, we can see a subclavian groove
and I can tell you that subclavian groove
as its name suggests is where the
subclavian blood vessels run past.
03:11
We also, as we have on the superior surface
that we looked at, similar bony attachment sites.
03:17
Here, we have the deltoid. Here, we have pectoralis
major, and here, we have subclavius muscles.
03:23
So, these are important muscle attachment sites
on the inferior surface of the clavicle.
03:29
Again, maybe just concentrate on looking
at the large areas of the clavicle.
03:33
Don't get hung up on the specific details.
03:36
You'll always have this resource to go back
to as we look at the muscles in more detail.
03:41
But try and get an early
familiarization of this structure.