00:01
Now we're getting
pretty far down there,
we're down to the
ankle and subtalar joints.
00:06
That's right ankle joint is really
what we were talking about
with the plantar
flexion dorsiflexion.
00:10
But there's also, because there's
so many different bones here,
something called
a subtalar joint
or a joint below a
bone called the talus.
00:19
So here's the distal
end of the tibia,
and the distal
end of the fibula.
00:23
And here's that ankle
bone called the talus.
00:27
And then I already said the
other name for Achilles tendon
is calcaneal tendon
because this is the name of
the heel bone, if you will,
that it attaches to.
00:36
They're the equivalent
of carpal bones,
but in the foot
instead of carpals,
we call them tarsals.
00:44
So movements at the ankle joint,
again, despite the fact that
all the muscles that do this,
we call them extensors
we call this dorsiflexion.
00:54
And all the muscles
we call flexors actually
cause something
called plantar flexion.
00:59
So again,
raising the toes up is dorsiflexion,
pointing them down as
plantar flexion at the ankle joint.
01:06
At the subtalar joint because
it's shaped a little bit differently.
01:10
This is the joint where we
have those funky movements,
inversion, and eversion.
01:20
So we're really getting
almost to the tips here,
we're at the dorsum of the foot,
which is from an
anatomic position,
the superior anterior-ish
portion of the foot.
01:31
The part you can see not
the part you're standing on,
those would be the soles of
the feet or the plantar surface.
01:37
So here we see something
very equivalent to what we
saw in the hand,
we see these really long tendons
coming from
further up in the leg
from the extensor
digitorum longus.
01:49
And we also have the extensor
hallucis longus going to the big toe
hallucis been our big toe
equivalent of pollicis for our thumb.
01:58
We have another retinaculum
or ban of connective tissue
holding these tendons down here
called the extensor retinaculum.
02:08
And we can see the
extensor digitorum brevis
and extensor hallucis brevis,
being much shorter.
02:17
We also have our anterior tibial
artery coming down towards the foot,
forming an important landmark
called the dorsalis pedis artery.
02:26
And this is clinically relevant
because it's so superficial
that it's very easily palpated
during a physical exam,
and when you're trying to
assess circulatory problems
for people especially
down in their feet
where it's common to
have circulatory problems.
02:41
One of the common
things you'll check
is a dorsalis
pedis artery pulse.
02:47
Finally, we're at the
bottom or soul of the foot
also called the plantar
surface of the foot.
02:53
And as we said our
equivalent of carpal bones
down in the foot
are the tarsal bones.
02:59
Similarly to the hand beyond
that we have metatarsals
and beyond that
we have phalanges.
03:06
Same thing with the
phalanges up in the hand,
we have a proximal,
middle and distal except
for the big toe which just
has a proximal and distal.
03:17
And this is where our tibial
nerve is going to terminate.
03:21
And we're going to see
this lateral plantar nerve
and medial plantar
nerve providing
sensation to the soul the foot.