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The [vertebral endplate] is the term used to denote a structure formed by the superior (and inferior) aspect of the vertebral body and a layer of hyaline cartilage related to it. The vertebral endplate is formed by the cortical bone of the anular epiphysis, the central depression and the hyaline cartilage that fills the depresssion.
The vertebral endplate is important for the health of the intervertebral disk (IVD). Since the IVD loses its blood supply early in life all the nutrition to the IVD has to pass through the cortical bone and the hyaline cartilage. Note that hyaline cartilage is avascular. Separation of the components of the vertebral endplate due to trauma or other pathology can cause the IVD to become pathological.
The vertebral endplate also plays an important role in the biomechanics of spine movement. Being slightly incurved, the endplate acts as a shock absorber, bending up to 1/2 mm. Damage to the endplate can reduce this function and set the stage for failure of the endplate and a potential vertebral fracture.
Sometimes the IVD can herniate through the endplate causing what is known as "Schmorl's bodies".
Image property of: CAA.Inc.Photographer: David M. Klein