Primary curvature - Curvatura primaria
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The thoracic and sacral (pelvic) curves are termed primary curvatures, because they alone are present during fetal life.
This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from http://www.bartleby.com/107/).
General Anatomy > Bones; Skeletal system > Axial skeleton > Vertebral column > Primary curvature