Sternum – 3D Anatomy Tutorial

Sternum – 3D Anatomy Tutorial


So this is a quick tutorial on the sternum.
The sternum consists of three parts. You’ve got the manubrium of the sternum, the body
of the sternum and the xiphoid process inferiorly. So we’ll begin by taking a look at the manubrium
of the sternum first. This is this superior part of the sternum. You can see it has two
articulations. You’ve got articulations with the clavicle and with the first costal cartilage
here. So there’s features of the manubrium that you need to know about. Superiorly, you’ve got this little notch up
here which is called the suprasternal notch because it’s above the sternum, at the top
of the sternum. This is also sometimes called the jugular notch. And then you’ve got a facet here on the superior
and lateral aspect of the manubrium, which is for articulation with the proximal end
of the clavicle. And for its articulation with the first costal cartilage, we’ve got
a facet for this attachment. And then right at the bottom of the manubrium,
you’ve got a little demifacet. ‘Demi’ just means half. So we’ve got half a facet here
for articulation with half of the end of the second costal cartilage. So obviously, this
means that there must be another demifacet. The other demifacet is just below on the top
of the body of the sternum. This articulates with the bottom half of the second costal
cartilage. So on the manubrium, you’ve got the sternal
notch superiorly. Then you’ve got facets for articulation with the clavicle and the first
costal cartilage. And then you’ve got a demifacet at the bottom of the manubrium for articulation
with the top half of the second costal cartilage. And importantly, where the manubrium meets
the body of the sternum, you get this angle called the sternal angle. This angle is often
called the Angle of Louis and it’s an important anatomical landmark. So I’ll do another tutorial
which talks about the important structures that can be found at the sternal angle. So
the sternal angle lies at the level of the intervertebral disc between thoracic vertebra,
T4 and T5. So moving on to the body of the sternum, you’ve
got this large flat bone. Along its lateral edges, it’s got articulations for the costal
cartilages. Remember the demifacet at the top of the body
of the sternum for articulating with the bottom half of the second costal cartilage, there’s
also a demifacet at the bottom end of the body of the sternum. This articulates with
the top half of the last two rib, so the 7th rib. So remember, you’ve got seven true ribs — so
one, two, three, four, five, six, seven. These ribs have their own costal cartilage for articulating
with the sternum. At the top, you’ve got the demifacet articulating
with the second costal cartilage. And then you’ve got facets for articulation with ribs
three, four, five and six. And then right at the bottom of the sternum, you’ve got another
demifacet articulating with the 7th costal cartilage. So the other demifacet lies on the xiphisternum.
The xiphisternum is this little process at the bottom of the sternum, inferiorly on the
sternum. And between the body of the sternum and the xiphoid process, you’ve got this fibrous
joint. So that’s all there is to it really. That’s
a brief outline of the sternum.

24 thoughts on “Sternum – 3D Anatomy Tutorial”

  1. when will you make videos about genital organs and the gastrointestinal tract? it's really very confusing area to many of us

  2. hi there, got some pelvic tutorials created and in the editing phase! will be tackling this area next. Thanks for watching

  3. Your tutorial videos re very clear to understand. You explain the subject materials in an unmatched way to any classroom teachings or textbooks. Thank you for what you do. Incidentally, when will you have video presentations on audio-vestibular system?

  4. Dear I am waiting for upper and lower limb lectures also include all nerves veins and arteries in upper and lower limb lectures. I love your lectures.

  5. whoever disliked this video is completely an idiot !!!
    THANK YOU VERY MUCH )))
    you are just making the anatomy wayyyy easier !! ))

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