You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which of this following pas of veebral canal will show secondary curves with concavity towards back? and explain in detail?
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.