A B and C are some of the parts of a human skeleton. Part A is a long, hollow rod that encloses and protects the spinal cord. Part B is at the top end of part A and it protects the brain. Part C is at the lower end of part A and forms two ball and socket joints with thigh bones. What is A, B and C?
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The vertebral column, also known as the backbone or spine, is part of the axial skeleton. The vertebral column is the defining characteristic of a vertebrate in which the notochord (a flexible rod of uniform composition) found in all chordates has been replaced by a segmented series of bone: vertebrae separated by intervertebral discs. The vertebral column houses the spinal canal, a cavity that encloses and protects the spinal cord.
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