The cervical and the lumbar vertebrae form an outward curve, which is called (i)_______, while the thoracic and sacral vertebrae form an inward curve called (ii)_______.
(i) Lordosis (ii) Kyphosis
The cervical as well as the lumbar vertebrae form an outward curve, which is called lordosis, while the thoracic and sacral vertebrae form an inward curve called kyphosis.