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Alright deltoids, we have three
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deltoids. We have upper, upper how many
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guys have an upper deltoid? Yeah I didn't think so, freak, what are you doing
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with an upper deltoid. All right anterior, one of my big pet peeves middle
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not medial, you don't have a medial deltoid, that's a mistake I see actually
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in text books all the time, medial deltoid yes that makes a lot of sense
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for the most lateral structure on your torso. Alright anterior, middle
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and posterior. These are kind of tricky, your anterior delt goes from, where
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was slim, let me get slim.
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You guys know slim?
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I don't know why you guys buy the real bone skeletons, they are so fragile,
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they're super expensive too. You figure after all the years that people have
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been using skeletons they'd come up with something a little bit more durable. Yeah
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all right this is slim, in case any of you wonder why I started working out to
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begin with this is what I looked like in high school. I had the body of a model
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when I started high school, a female runway, model it was terrible, no joke I
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started 6'1, 145 pounds, my freshman year. Not okay, they tried to duct-tape me
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to a pole and I started lifting weights, that's that's the story of how I became
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a personal trainer. All right so this is slim, your anterior delt goes from this
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right here the edge of your clavicle right, your acromion shelf wraps around
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the front into something called your deltoid tuberosity, deltoid tuberosity
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what's a tuberosity? A bone bump, and this is the bone bump that your deltoid
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connects into. You guys can all find your deltoid tuberosity, just take your hand
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palpate your shoulder right, palpate your deltoid, bring it down to the point right
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here, there's your deltoid tuberosity. Not bad right, there you go. So this one kind
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of goes and wraps around like this, so what joint does it cross?
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Your glenohumeral, your shoulder joint. So all of these are going to be shoulder
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joint actions right. So I'm just going to write shoulder up here, that means
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technically we need a new word bank right, we can't use our scapular
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actions for our shoulder. What's my word bank for my shoulder? So I got abduction
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and adduction,
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I got flexion, I got extension, internal rotation,
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external rotation and horizontal AD and AB duction. So if I'm talking about the
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shoulder it has to be one of those joint actions yes. Alright so let's go back
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to the anterior delt, it's this way. So if it runs in front of my shoulder joint,
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what joint action do you think it's going to contribute to? Flexion, good.
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What if I do this, now where is it? Still in front of my shoulder right, but now
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when it shortens how is it going to pull my arm? Horizontally, you guys got that.
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Yeah so that's horizontal adduction. It also kind of wraps around my humerus too
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right, wraps around just a little bit. Generally things that wrap around bones
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or have an obliquity, obliquity is a diagonal to them, will contribute to some
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sort of rotation. Which type of rotation do you think my anterior delt is going
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to contribute to? Internal.
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What do you guys think? Does that make sense? Touch your anterior
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delt for me, all right now internally rotate, you feel that guy contracting a
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little bit? Yeah. Alright so let's look at the middle delt, the middle delt is
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the part of your deltoid that goes from acromion shelf and runs straight down the
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side the deltoid process. So it runs up and down on the side of my body. What
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plane did we say those muscles would probably work really well for? Up and
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down on the side of my body, frontal plane right. So now we could take our
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word bank and chop it down to just our frontal plane joint actions. Alright
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you guys are 50/50, which joint action is this one going to cause when
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it shortens? Yeah this is abducting away.
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Posterior delt, so my posterior deltoid runs from the lateral aspect of the
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spine of my scapula back down to deltoid process, and so now it runs up and down
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on the back of my shoulder joint, what do you think it's going to contribute to?
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Extension sure. What else, what if I did this, if I did this what is this exercise
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called? A reverse or rear delt fly right, you guys have heard that before. So what
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joint action is that? Horizontal AD or a AB? AB, horizontal abduction, and
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what's this, this one's kind of got the wrap around thing happening right. Yeah so
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since this one's back here though, if it shortens it's going to pull me into...
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external rotation; and if you guys caught on, anterior and posterior delt what's
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interesting about them? They're opposites right, anterior flexion, posterior
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extension, anterior horizontal adduction, posterior horizontal abduction,