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You have 24 vertebrae
in your spinal column.
Two are special enough
to be individually named.
Your atlas(C01) and axis(C02)are very important vertebrae. Withoutthem, head and neck movementwould be impossible.
Lets take a look!
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The atlasand axisare the most superior
bones in the cervical vertebrae.
Together, the atlas and axissupport the skull, facilitate
head and neck movement, andprotect the spinal cord.
The atlas is the top-most
vertebra, sitting just below theskull. The axis is below it.
(Think of the atlas and axis as best buds for life.You will never find one without the other.)
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There are many types of vertebral
joints, but the atlas and axis form
the only craniovertebral joints in thehuman body.
A craniovertebral joint is a joint
that permits movement between
the cervical vertebrae and the
neurocranium.
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The atlanto-axial joint
connects the axis to the
atlas. It permits rotational
movement of the head.
The atlanto-occipital joint
(pictured) connects the atlas
to the occipital bone. It flexesthe neck, allowing you to
nod your head.
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The atlanto-axial joint is a compound synovial joint.
This pivot jointallows for rotation of the head and neck.
A pivot joint is made by the end of one articulating bone rotating in aring formed by another bone and its ligaments.
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Watch this
joint in action!
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The atlas and axis are part of
the sevencervical vertebrae.
These vertebrae have a fewunique features:
They are the smallest ofthe vertebrae.
C01C06 have threeforamina: one vertebraland two transverse.
The protrusion that can befelt at the back of the neckis the nonbifid spinousprocessof C07.
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The atlas and axis, like the rest of the vertebrae,
protect the spinal cordand give passage to its
dorsal and ventral roots.
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All right.
Lets take a break and review.
The atlas and axis are the most
superior vertebrae.
They form a pivot joint, which allowsyou to turn your head and neck.
The atlanto-axial joint connects the
atlas to the axis.
They are part of the vertebral column,
which supports the peripheral nervoussystem.
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Now lets review some
bony landmarks.
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The atlas (C01)is the first of the cervical vertebrae.
Unlike the other vertebrae, theatlas does not have a body ora spinous process.
It is ringlike and consists of an
anterior and posterior arch, andtwo lateral masses.
Posterior archLateral mass
Anterior arch
Lateral mass
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The transverse processesof the atlas serve for
attachment of muscles that assist in rotating the head.
The holes in the processes,or foramina, give passage
to the vertebral artery andvertebral vein.
The obliquus capitis superior,obliquus capitis inferior, andsplenius muscles attach to
the processes.
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The inferior articular processesare flat and circular in shape, andpermit the rotatory movements of
the head.
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The inferior articular processesserve as the
site for articulation with the axis.
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The facet for the densis the site where the dens
of the axis articulates with the atlas.
The articulation of the atlas on the dens provides the head withapproximately 50% of its movement.
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The axis (C02)is the second cervical vertebra.
It is somewhat analogous to the
other cervical vertebrae in thatit has a spinous processthat is not obviously bifidlike the rest of the cervical
vertebrae.
Factoid:The axis is also known as the
epistropheus.
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The spinous process serves as
the attachment site for many
muscles of the spine, as well as
the nuchal ligament.
The process is not as obviously
bifidas the other cervicalvertebrae. Muscles closer tothe skull attach here, whereasmuscles that stretch along the
length of the spine attach to theprocesses of the others.
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The odontoid process, or dens, is a projection of
bone that is fused with the atlas.
The dens rises perpendicular
from the upper surface of theaxis body.
It articulates with the ring formedby the anterior arch and thetransverse ligament of the atlas,creating the pivot joint.
Factoid:Dens is Latin for tooth; odontoid comes from the Greek root odon, also tooth.
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All the images and most of the text in thiseBook came from our Skeleton Premium
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