intervertebral disc

Question 1

Intervertebral disc
Separate

Answer 1

disc separate the vertebrae acting in concert with facet joints

Question 2

Intervertebral disc
% of spine and % of components

Answer 2

makes up 20/25% of spine length

Annulus is made up of 70% water, 15% collagen and 5% proteoglycan.

Nucleus pulposus is made up of 77% water, 14% Proteoglycan and 4% collagen.

Cartilage end plate is 55 % water, 25% collagen, 8% Proteoglycan.

Question 3

Intervertebral disc
Nerve innervation

Answer 3

Peripheral p. aspect innervated by sinuvertebral nerve and A. by branches on grey rami communicants.

doesnt cause pain so pain in that area will mostly come from ALL, PLL, vert bodies, nerve roots and cartilage

Question 4

Intervertebral disc
Preloading

Answer 4

Preloading occurs due to water content, as water is non-compressible
=greater resistance to compressive forces
= resistances to lat f

Question 5

Intervertebral disc
Annulus layers

Answer 5

Layers allow tolerance to asymmetrical loading especially torsion - R with pressure

Question 6

Intervertebral disc
Semifluid

Answer 6

semifluid quality of discs accommodates for the variations of angles between vertebra to accommodates the changes in spinal curves

Question 7

Intervertebral disc
Content

Answer 7

nucleus pulposus - 70% water to be able to take on heavy weights

annular fibrosus & cartilage endplate - 15/25% collogen for flexibility and rigidity