By Rene Cailliet MD
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Extra resources for Low Back Disorders: A Medical Enigma
Sample text
Some creep is permitted within physiologic limits. The intervertebral disc is an avascular tissue (Fig. 10) that receives its nutrition from imbibition. This means that for normal function during the day there must be periods of no compression, flexion–extension, rotation, or torque. Being one of the end organs of neurophysiologic function that indicate relief from compressive forces of gravity, and paraspinous muscular contraction results in inhibition. POSTERIOR SPINAL ELEMENTS The posterior segments of the vertebra forming the functional unit include the zygapophyseal joints (facets), the pedicles, lamina, posterior FIG.
Yabuki S, Igarashi T, Kikuchi S. Application of nucleus pulposus to the nerve root simultaneously reduces blood flow in dorsal root ganglion and corresponding hindpaw in the rat. Spine 2000;25:12:1471–1476. 39. Sarno J. Mind over back pain. New York: William Morrow, 1984. 40. Verbiest H. The management of cervical spondylosis. Clin Neurosurg 1983;20:262. 41. Zimmemann M. Regulatory functions of the nervous system; as exemplified by the spinal motor system. In: Schmidt RF. Fundamentals of neurophysiology.
They are enclosed within a synovial capsule that has sufficient redundancy to allow a large range of motion but is too thin to be a limiting tissue, although its ventral portion is reinforced by the ligamentum flavum. At its attachment to the facets the synovium is thickened and plicated on itself. Within this plication resides small fat pads that project into the joint space by several centimeters and form a fibroadipose FIG. 10. Blood supply to the intervertebral disc. No blood vessels (BV) enter the normal disc.
