00:01
Now, we're going to
break down a single osteon.
00:04
So that's what we have here.
00:06
So we're gonna take a really
close up look at a single osteon.
00:11
Now, before I go on,
I want you to picture.
00:13
Remember the graphic and the drawing
that showed the multiple osteons?
Good deal. Because I want
you oriented before we go on.
00:21
Now, look at dead center,
what do we have there?
Right. There's your vessels.
00:27
Those are carrying blood and fluids.
Good deal.
00:30
Let's get close
and personal with this.
00:33
Now, we're showing you another image
just to remind you,
Why are we using repetition?
Because that matters.
00:40
Every time you think in your brain
and try to picture it yourself,
now we're showing it to you here
just to remind you,
it's gonna stick a lot better,
because we really think at Lecturio,
studying as you go is the way to go.
00:54
We don't want to just
give you information.
00:56
We want to help you learn.
That's what we're here for.
00:59
So, here's our single osteon.
01:02
I want you to look on the outside.
01:04
Notice,
we have a lot of blue cells.
01:06
And then one kind of
maroon reddish color cell.
01:09
Well, the reddish color cell,
the bigger one
with kind of like almost looks
like tentacles going out,
that's a type of cell
called an osteoclast.
01:19
So this whole thing together
is an osteon.
01:22
But that kind of big reddish cell,
that's called an osteoclast.
01:27
Now, the blue ones that you see
all the other way around,
those are osteoblasts.
01:33
Okay, so the outside of an osteon
has osteoclast and osteo blasts.
01:38
Good deal. Now, let's go
a little in the next inner circle.
01:43
Those are called osteocytes.
So see those there?
Those are inner circle.
Those are osteocytes.
01:50
Now, what four letters
do each of these,
actually five letters,
to each of these
features have in common?
It's osteo, right?
O-S-T-E-O.
02:03
That tells us we're
dealing with bone.
02:06
So osteo-clast,
osteo-blast, osteo-cyte.
02:10
Those are three key important cells.
02:13
I want to make sure that
you're familiar with,
and you know the difference
in their form and function.
02:17
Now, you'll see that
we have the lamellae
and we've talked about that before
how in spongy bone it's kind of
right interlaced and compact bone?
It's very dense.
That's important for you to know.
02:29
Now, let's zero in on,
right to the central canal. Got it?
Now, we've got structures in there.
What do we have? Artery. Vein.
02:40
You got nerve and lymphatic vessels
right deep in the
center of the osteon.
02:47
You know,
if you look at your body,
this kind of seems
to be a common theme.
02:50
Think about what you know
about your liver,
about the units in your kidneys,
this is pretty cool
how you see the similarities.
02:57
So right dead in the center
in the central canal
of a single osteon,
you have arteries, veins,
nerves, and lymph vessels
or lymphatic vessels.
03:08
Okay, you're with us.
Good deal.
03:11
Now, let's take a look
at these cells again.
03:13
What are the three
most important cells
I wanted you to remember
when it comes to bone structure?
Perfect, there on your screen now.
03:23
These are three
special types of cells
that are found only in the bone.
03:28
They all start with osteo because
that's the Greek word for bone.
03:33
So you have osteoblasts,
osteoclasts, and osteocytes.
03:39
Yeah, we went ahead and put those
in order for you by their letters.
03:43
But just think about osteoblasts.
03:45
Look, we made them blue for you.
That's cool.
03:48
Osteoclast are there, and
the osteocytes are in the center.