All right, guys. So welcome to the third example.
I'm going to show you how to do this leg, extending backward.
As always, I'm going to start with the cylinder of the leg, so that I can imagine the glutes
reacting to the form of the leg muscles as well.
It'll help me.
Coming at us a little bit, I'm going to show the bottom cap here.
And then this is all gonna be covered but for my own reference.
It's going way at the top.
And then the other leg on the other side, going away from us here, although I don't
really see much of the glute.
So this whole demo, or this whole example, is just going to be focused on this one side.
We're gonna see a little bit of the glute, over here on the left side, but...
You know, not much more complicated than just this curve.
So okay, there is the leg cylinder.
Now, let's start roughing in the shapes of the glutes.
The main thing for this demo that I want to show you is that most people when they draw
in the gluteus medius are just going to connect the gluteus medius right on top here just
like that, as if it's in a neutral pose.
But what you've got to remember, or notice is that this leg is extending back
this way.
And so the top, the insertion of the gluteus medius, is being rotated this way.
And we saw some of that in the first example, how when the femur rotates like that it's
going to create this kind of S-curve to the gluteus medius because this bottom part gets
pushed forward.
And that does translate to the surface.
You're going to see a shadow pattern, kind of following an S-curve like this.
I'll probably have to draw it outside here so you could see a little better.
But it does bulge out a little bit and it creates an S-curve form.
And then the TFL gets pushed out a little bit with that, so it'll be a little bit of an S-curve.
But it's also just really stretching because of being pulled back.
So it's going to be skinnier than in a neutral pose.
And gluteus maximus, it attaches all along here in the femur.
And since the leg is being pushed out, it'll push some of this gluteus maximus out as well.
So the leg muscles are pushing on the form, or the mass of the gluteus maximus, and so
it'll pop out like that and then wrap around the cylinder of the leg attached to the iliotibial
band, and that kind of curves forward like that.
And again, that back glute is just gonna... we're just gonna see a little piece of it.
But I want to make sure that it attaches to the right spot so that the pelvis is up here,
starts from there, curves around, gets stretched here, and then attaches to the femur.
And remember that tire again, that's gonna come into play a lot when we have the leg moving.
The hip muscles are the ones doing the motions, and so they're gonna flex.
In this case, the leg is being pulled back and the gluteus maximus is the one that pulls it back.
And as the gluteus maximus flexes, it will flatten the side and create this tire shape.
So this edge, right in here, of the tire will show up right here on the gluteus maximus.
So there's an interesting rhythm happening here along this area where... along this kind
of sharp corner of the tire.
So in this area, it just kind of follows this C. And then here, we get this S-curve, and
so the muscles are going to bulge out like that and like that.
And in this whole right here is kind of tendinous.
And so if the gluteus medius is flexing, the bulge happens up here like that.
And this bottom area kind of stays flattened, just how this area is flattened on the gluteus maximus.
And then in here, it turns back and you see the TFL curving back this way.
So you kinda have this curve this way and then an S-curve this way.
So gluteus maximus up this way, then gluteus medius turns into an S-curve at the TFL.
And I know this because I've seen it on models and I also just... I saw some diagrams in books.
I think it was the Richer book that I saw a little drawing he did and I noticed this S-curve.
And it really explained well how the muscles are flexing and what's happening.
So it's good to start paying attention to some of these rhythms that happened during
various poses.
And now that we know the muscles, we understand why they happen.
Just to clarify that S-curve concept and why that's happening.
So you have... gluteus medius attaches to the pelvis at the top, kind of comes down like
that, similar shape to the deltoid if you remember.
And it attaches to the greater trochanter at the top.
And then what happens when the femur extends backward is that greater trochanter rotates.
And so now the insertion pushes the gluteus medius out like that.
And like I said, this bottom area in here is kind of tendinous.
And so what happens is the fibers, they create kind of an S-curve shape as they attach.
And then you add the TFL to it, and you have this mass of the TFL, which helps to reinforce
that S-curve.
So these muscle fibers that I drew here, that's kinda like the side plane of the wheel,
or of the tire, which connects to the gluteus maximus like that.
And then the fibers will... or not the fibers, but the form kinda rolls over like this.
Okay, so let's clean this up a little bit.
I'm pretty happy with the shapes I drew in the rough, so I'm not going to change too much.
And one thing I actually didn't mention is that, you know, the reason that it feels more
flexed up here or in the back and it's a little more relaxed over here is because... remember
how the gluteus medius has a posterior and an anterior side, and they activate at different times.
So when the leg needs to flex forward this way, the anterior part will flex.
And when it needs to extend backward, the posterior one will flex.
It's kind of its own antagonist.
And so in this pose, this backside is flexing more, that's why it's being compressed whereas
this one is flowing all the way down here.
It's very relaxed.
I want to make sure I don't bulge out the TFL too much because it is being stretched out.
It's not flexing at all because the motion is going the opposite direction.
And then gluteus maximus being pushed out, main concern here just to make sure that it
bulges back enough.
So as the leg extends back like this, the gluteus maximus doesn't really have anywhere
to go, you know, the hamstring muscles push on it.
And make sure you're not just kind of going straight like this when you add your fibers.
Think about the form and how the fibers will wrap around.
Notice how much I'm curving it right in this area because that's the corner of that tire
and that's where it's going to turn most.
And then right along the side, it kinda flattens out.
And along the back, kind of flattens, and it actually even kind of curves back in a little
bit as it turns to attach back onto that sacrum.
Other side of the gluteus maximus, and I'm going to actually flatten it a little bit.
So one thing I want to mention is that, you know, the sacral triangles are actually like
right underneath in there, right, like right there but this gluteus maximus is being really
pushed out.
And maybe I'm exaggerating a little bit but I want to make sure I show that form coming out.
And so it's covering up some of that sacral triangle because we are looking at it from
mostly a side view.
You know, if we look more from a back view, we'd see the actual attachment to this, the sacrum.
But from the side, the contour will actually just be the form being pushed out, not the
attachment to the sacrum.
And I'm going to start coloring in the muscles as I did before, real rough at first and I
can clean up the edges later.
There you go, just erasing back some the edge work.
Oh, actually, I just realized I forgot to draw the IT band.
Sometimes in poses like this, you might even see a pinch, like, right here instead of on
the outside of the IT band.
There's actually a few layers, and I'm going to talk more about this in the quad muscle
lesson because it affects the quads more than it does the glutes.
But there's a few layers of the IT band.
And there's one layer that comes out from the greater trochanter and kind of comes
down like this, and that sometimes pinches more than the outer edge.
Sometimes on really lean people, you'll see all the edges.
It's kind of crazy.
Okay. Now, let's focus on the shading.
I'm gonna lighten the tendinous part a little bit, of the gluteus medius.
I'm gonna push that in, separate the muscle from the tendon a little bit.
And actually, do a similar thing with the gluteus maximus, just lighten that flat plane
on the side.
Okay, and then I can start putting in the shadows, sort of, just thinking about the
wheel shape or the... I keep saying wheel. The tire of the glutes as I shade this.
That's really the main form that I usually think of.
And then as it comes into the gluteus medius, there will actually be kind of a bottom
plane as it attaches to the tendinous area over here and here.
So you'll see these as actual bumps because this part of the gluteus medius is really
active, I'm gonna show its form.
Think about some of the lighter planes.
The top right planes, those are going to be lit.
And then finally addressing some of the highlights.
I'm just being really rough here, thinking of the big form,
not too much of the individual muscle fibers.
I wanna capture the big form.
Okay, I think that looks pretty good.
I haven't even actually added the core shadows.
Okay, I'll add them real quick here.
But it's looking pretty decent without even core shadows in there.
So I think I did enough shading with the half tones and highlights that we don't really
need to add these core shadows and deeper occlusion shadows but here they are.
All right, guys, so that's it.
That was the last example.
So we're going to be moving on to the next muscle group in the leg.
And, as always, make sure to check out the Premium Section.
There's a lot of extra content in the main lessons.
There's 3D models, eBooks, extra demos.
That sort of thing.
So if you're getting a little serious about your anatomy studies, I recommend checking
out the full course.
Alright, see you guys later.