nucleus pul·po·sus -.pəl-'pō-səs n, pl nuclei pul·po·si -.sī an elastic pulpy mass lying in the center of each intervertebral fibrocartilage and regarded as a remnant of the notochord
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[TA] a semifluid mass of fine white and elastic fibers that forms the central portion of an intervertebral disk; it has been regarded as the persistent remains of the embryonic notochord.
Intervertebral disk in transverse section, showing the nucleus pulposus and the anulus fibrosus.
Medical dictionary. 2011.