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Atlas & Axis Cervical Vertebrae (C1-C2) Anatomy

Alright Ninja Nerds, we are going to take a look at Atlas and Axis. So what we're

looking at right now is Atlas, C1. We're looking at the superior surface here. If

you look at the superior surface, we have these little depressions here, these are

called your superior articulating processes with facets right there. These

are what articulate with the occipital condyles of the occipital bone to form

what's called the synovial condyler a joint. Right here we can see little bump,

a tubercle. That's the anterior tubercles, this is

obviously the anterior side of the cervical vertebra and over here is the

posterior tubercle and so this would be the posterior side of the tubercle

cervical vertebra. Over here we have these little bumps out here, these little

bumps out here the transverse processes. Okay I have the cervical vertebra and

then we have these holes where the vertebral arteries run through and those

holes are called the transverse foramina. Okay then I got this big hole and that is your

vertebral foramen. We look over here and they get vertebral foramina, that's where

the spinal cord runs through. If we look back here, we have like an articulating

surface right here for the dens or the odontoid process or c2 and that will

allows for that rotation around that point or that pivoting point of it.

Alright so again that's the articulating surface for where the odontoid process

or dens of our axis articulates with. Now what I'm going to do is flip it

over, so we can get a different view here, alright. So, take a look at the inferior

view here, these are here your inferior articulating processes with

facets and they articulate with the superior articulating process of facets

with C2 or axis and that's what allows for a specific type of joint that I'll

talk about here in a second which is called a synovial pivot joint. We'll take

a look at it in a little bit and then again, this is going to be the anterior

side as the anterior tubercle. And over here there'll be a posterior tubercle

and these are your arches. They call them arches. This be the anterior arch and

this would be the posterior arch back here. Again vertebral foramen right here,

is where the spinal cord runs through and again you can see these transverse

processes over here, you can still see the transverse foramina which is where

these holes of the vertebral arteries run through okay. So again, this is going

to be our C1 or Atlas let's take a closer look now at

C2 or Axis. So you can its Axis because it has this like a dens

or an odontoid process, this little something sticking right up again. This

is dens or odontoid process. These over here are the superior articulating

processes or facets and these articulate with the inferior articulating process

with facets of the upper cervical vertebra or C1. This is our vertebral

foramen where the spinal cord runs through. This is our spinous process right there

and that's what's designed to be able to protect the spinal cord. Right now we're

going to flip it over so we can take a better view of some other structures.

Alright, so now we're going to do is, we're going to take a look. If you see

this is a chunky part of the bone right, there it's called the body or the

centrum, that's the weight-bearing effect right there. The cervical vertebra is

going to be where a lot of the weight is being applied okay.

Then over here you can see these little processes over here, these

processes are again they're transverse processes. They're better seen from the

inferior surface and then again you got these little bridge your transverse

foramina right there, transverse foramina and again that's where the vertebral

arteries run through. And then here these little articulating surfaces right here,

these right here called your inferior articulating processes with facets, okay,

and they'll articulate with the superior articulating processes of the lower

cervical vertebra, our C. And again, here's the spinous process protects the

spinal cord, and again there's your vertebral foramen where the spinal cord

runs through okay. That's our C2 or axis Alright guys, so now I wanted to show you the

articulation between C1 and C2 or Atlas and axis. So again you can actually see

that part right there, the odontoid process how it's articulating and

pivoting around that point right there. And that articulating surface right here

or the anterior tubercle is or the anterior arch. I wanted to show you that

and then also you can see the articulation here, I kind of turn this

over a little bit you can see. Here's your inferior articulating surfaces

process with facets for your C1, how it articulates with the superior articulating

process facets of C2. And again that interaction the articulation between

those two points and where this odontoid process is sitting is what allows for

this this joint to move from side to side or pivot around

central access, so it allows for the C1 to kind of pivot around that

odontoid process and the forms what's called a synovial pivot joint alright. So

that covers again in this video C1 and C2 or Atlas and Axis.