How does lung volume change? (video) | Khan Academy
However, the intercostal muscles are diverse and widely distributed .. In addition, the slope of the relationship between ΔPao/m and the. We hypothesized that during exercise, intercostal muscle blood flow would be limited by Relationship between pulmonary O2 uptake kinetics and muscle. The mechanical advantages of the external and internal intercostals depend partly on the orientation of the muscle but mostly on interspace number and the.
So you've got a total of 12 ribs and seven pairs of them. Actually, I should say 12 pairs of ribs. I don't want you to think there are 12 total. We actually have 24 total and seven pairs of the ribs. So 14 ribs actually attach directly to this sternum bone. So in white, these are the ribs. And between the ribs, you actually have muscle.
So I'm going to draw in some of these muscles between the ribs. And these muscles are all going to have their own nerve that allows them to contract.
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- Intercostal muscles
- What is an intercostal muscle strain?
So these muscles are controlled by your brain, and their name-- let me just jot down here on the side-- is intercostal muscle. And inter just means between, so this is the name of the muscle. And costal refers to the ribs.
So when you see that word costal, you'll know we're talking about the ribs. So what's between the ribs is these muscles, intercostal muscles. And they are going to start moving outwards when your brain says, hey, I want to take a deep breath. So these muscles are going to contract. The ribs, I should say, are going to move outwards. So these go out. And you also have-- let me just make a little bit of space on this canvas-- another muscle that kind of rides down here and has kind of an upside down U shape to it.
So I'm drawing it kind of like a dome. You can think of it as a dome.
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And this dome is the floor-- if you remember, we talked about the floor of the thorax. So this is, of course, our diaphragm muscle. So we've got our diaphragm muscle. And this one when it contracts, instead of going out, it's going to go down.
So it's going to kind of flatten out. And I can actually draw this. If you can now just stick with me for a moment, I'm going to erase this dome-like shape.
And I'm going to draw what it looks like as it contracts. So when it contracts, it's actually going to be more flat. And this flat diaphragm, as you can see, is now further down than it used to be. And as it goes down, all of the structures that are inside this space-- so the two lungs.
And of course, I didn't draw the heart here. But the heart would be kind of in this cardiac notch. If you want, maybe I could even draw that heart here. They're all going to kind of physically move down. So this is our heart and our lungs. They're physically going to be kind of drawn downwards and out.
They are going to also move out as the intercostal muscles move out. So you have expansion of these lungs. That's basically the idea. And if you were to kind of zoom in on this to kind of see exactly what this expansion looks like, when I say you have more volume in the lungs, really what I should be saying, if I wanted to be more exact, is that all the alveoli-- if these are the alveoli, let's say this is another branch.
And this is another alveoli right here. All these alveoli, they are actually expanding. And you have about million alveoli.
If you can just kind of fathom how big a number that is. It's an enormous number of alveoli.
And if I was actually drawing them, I would be here drawing forever. It would take forever to write out this many different alveoli. Pain due to upper back injuries is usually felt as a sharp, burning pain in one spot. The pain can spread to the shoulder, neck, or elsewhere in the upper body, and it may come and go.
Intercostal muscle strain is almost always the result of some event, such as overexertion or injury. In contrast, the initial source of pain from pneumonia or other lung disorders is difficult to pinpoint. If the specific area of discomfort can be located, such as between the ribs, this indicates the pain is not coming from the lungs or the upper back.
Intercostal muscle strain: Signs, treatments, and remedies
Lung pain is usually described as sharp and spreading outward. When a rib is fractured, the pain is usually much more severe than that of intercostal muscle strain. The following symptoms may signal a rib fracture: Common causes A direct blow to the ribcage may cause intercostal muscle strain. Routine activities are not usually the cause of intercostal muscle strain.