Up to 90 off textbooks at amazon canada plus free two day shipping for six months when you sign up for amazon prime for students. The normal human spinal column contains 23 fibrocartilage intervertebral discs 6 cervical 12 thoracic and 5 in the lumbar region each a few millimeters thick lying between adjacent surfaces of the vertebrae and making up roughly a quarter 7 to a third 4 of the height of the column
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