Clavicle (Collarbone)

by James Pickering, PhD

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    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.

    About the Lecture

    The lecture Clavicle (Collarbone) by James Pickering, PhD is from the course Osteology and Surface Anatomy of the Upper Limbs.

    Included Quiz Questions

    1. The inferior surface has a conoid tubercle and a trapezoid line.
    2. Medially, it is concave, and laterally, it is convex.
    3. The superior surface is rough.
    4. The conoid tubercle is present on the superior surface.

    Author of lecture Clavicle (Collarbone)

     James Pickering, PhD

    James Pickering, PhD

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