|
|
Intervertebral
Discs
|
','','scrollbars=yes,width=680,height=550')" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Image33','','../images/print2-green1.jpg',1)"> " onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Image64','','../../images/forword2.jpg',1)"> |
| |
| The intervertebral discs make up one fourth of
the spinal column's length. There are no discs between
the Atlas (C1), Axis (C2), and Coccyx. Discs are
not vascular and therefore depend on the end plates
to diffuse needed nutrients. The cartilaginous layers
of the end plates anchor the discs in place.
The intervertebral discs are fibrocartilaginous
cushions serving as the spine's shock absorbing
system, which protect the vertebrae, brain, and
other structures (i.e. nerves). The discs allow
some vertebral motion: extension and flexion.
Individual disc movement is very limited - however
considerable motion is possible when several discs
combine forces.
|
Annulus Fibrosus and Nucleus Pulposus |
Intervertebral discs are composed of an annulus
fibrosus and a nucleus pulposus.
|
| |
|
The annulus fibrosus is a strong radial tire-like
structure made up of lamellae; concentric sheets
of collagen fibers connected to the vertebral
end plates. The sheets are orientated at various
angles. The annulus fibrosus encloses the nucleus
pulposus.
Although both the annulus fibrosus and nucleus
pulposus are composed of water, collagen, and
proteoglycans (PGs), the amount of fluid (water
and PGs) is greatest in the nucleus pulposus.
PG molecules are important because they attract
and retain water. The nucleus pulposus contains
a hydrated gel-like matter that resists compression.
The amount of water in the nucleus varies throughout
the day depending on activity.
|
|
|
|
|
|
TAIWAN SPINE CENTER
|
 |
|
|
|
|
|
