<prompt> Which of this following pas of veebral canal will show secondary curves with concavity towards back?Cervical Veibral CanalThoracic Veibral CanalSacral Veibral CanalCoccyx Veibral Canal  <response>: In adults, the cervical curve and lumbar curve is concave backwards. The thoracic and sacral curve is convex backwards.Ref: Clinical Anatomy by Systems, Richard S. Snell, Edition 2007, Chapter 12, Page 860; Anatomy at a Glance, Omar Faiz, 3rd Edition, Chapter 77, Page 175. 