00:02
One anatomic landmark that
we're going to point out here,
going back to the anterior
surface is something
called the femoral triangle,
though.
00:10
So what we have
here is one other
muscle that we
didn't really talk about
it's kind of funky,
but it's kind of cool, sartorius.
00:19
Sartorius has a long
serpiginous course.
00:23
And it actually refers to the
word meant for being a tailor,
which is not very
intuitive why that might be.
00:31
That's because it does a
complicated combination of movements
that I'll just summarize as
basically the hacky sack movement.
00:40
Its external rotation,
and it's hip flexion,
kind of all at the same time.
00:47
And it's thought
of as the sartorius,
because that's where
people would have to sit
when they were getting
their pants tailored,
very not intuitive name,
but kind of a neat story.
00:58
But that's going to be part of
the border of our femoral triangle.
01:02
We're also going to
have the adductor longus.
01:06
And then we're going
to have something called
the inguinal ligament
up on our pelvic bones.
01:11
And so these three things
is going to form a triangle
called the femoral triangle
where some important
femoral structures
are going to go through.
01:19
Importantly, the femoral nerve,
femoral artery and femoral vein.
01:27
And there's a little
interesting quirk here
that there's almost
sort of an empty spot.
01:32
It's not really empty,
but it's a spot where you could
potentially have structures
pass through that shouldn't.
01:39
And when something
passes through an opening
it shouldn't we
call that a hernia.
01:44
So this is where you
can have a femoral hernia
at this medial portion
of the femoral triangle.
01:53
So another anatomic
landmark that we alluded to
but didn't really say
why it was there yet.
02:00
Was that opening
that we saw when
we're talking about the
medial compartments?
That brings us to
the adductor canal.
02:07
So if we look at the
femoral triangle superiorly,
and we go down to that
little opening or hiatus,
we see that we have the pathways
for the femoral artery and vein.
02:18
Now as the femoral artery and vein
are coming down as certain point,
they're going to have
to cross the knee.
02:24
And if you think about an artery
carrying blood fluid, essentially,
if it were to pass anteriorly on the knee,
every time you bent your knee,
you would compress it so much,
the blood couldn't move past it.
02:37
So instead,
the femoral artery and vein pass
posteriorly through this
opening this adductor hiatus,
so that it can go
behind the knee.
02:47
And at that point, it changes name
to become the popliteal vessels,
because we generally refer to the
back of the knee as the popliteal space.
03:00
Another thing going
on here is that nerve
that we mentioned
the obturator nerve.
03:05
Obturator kind of refers to this
general medial compartment area,
because we also said there
was an obturator foramen
and sort of the medial
part of the bony pelvis.
03:17
In terms of the posterior thigh,
we alluded to that
really large sciatic nerve,
but the sciatic nerve story won't be
over with just in the posterior thigh,
it's going to branch and
provide a lot of important
innervation when we
learn about the leg.
03:32
We also see that there are a
bunch of perforating arteries
supplying the
thigh in this area.
03:39
And then eventually,
we see from the posterior point of view,
that femoral artery passing
through to move posteriorly
as the popliteal
artery behind the knee.
03:53
So we have the
femoral artery as really
the main entry point
into the lower limb.
03:58
And then some branches
like the deep femoral artery.
04:02
We have the medial
femoral circumflex artery.
04:06
We also have the lateral
femoral circumflex artery,
which again, fairly analogous to
the ones we saw up in the humerus.
04:14
And then if we zoom in,
in that general area of the knee,
we see the femoral
artery again going through
the adductor hiatus to
turn into the popliteal.
04:25
The nerves going
down into the lower limb
are coming from this roughly
brachial plexus equivalent,
though not quite as complicated,
called the lumbosacral plexus.
04:38
And for orientation sake,
here we have the 12th rib,
and this square muscle
called the quadratus lumborum,
along which some of
these lumbo sacral nerves
are going to pass around,
such as the iliohypogastric.
04:53
Ilio, again,
referring to that iliac type area,
hypogastric meaning
sort of below the stomach.
05:00
Ilioinguinal same idea for ilio but
inguinal means basically growing.
05:06
Then we have lateral
femoral cutaneous
that's getting a little more
clear because lateral femoral,
we know what those words
meaning cutaneous refers to skin.
05:16
We have genital femoral nerve,
which will have a genital
branch and a femoral branch.
05:21
And then this large
one is the femoral nerve.
05:25
Posteriorly a little harder
to see is going to be
the sciatic nerve going
through those external rotators.
05:33
And so again,
we had the superior gluteal nerve,
and the inferior gluteal nerve,
taking care of our
various gluteal muscles.
05:41
We have the posterior
cutaneous nerve,
the thigh for cutaneous
sensation in this area.
05:46
And that large sciatic
nerve going all the way down
towards the knee where
it's eventually going to branch
into a tibial nerve and a
common perineal or fibular nerve.