Final answer:
The term spondylitis refers to an inflammation of the 4) vertebrae.
Step-by-step explanation:
Spondylitis is a condition characterized by inflammation of the vertebrae, which are the bones that make up the spinal column. This inflammation can lead to pain, stiffness, and restricted movement in the affected area. There are different types of spondylitis, including ankylosing spondylitis, which primarily affects the lower back and pelvis.
Treatment for spondylitis may include medications, physical therapy, and lifestyle modifications. So therefore spondylitis refers to an inflammation of the vertebrae. It can cause pain, stiffness, and restricted movement in the affected area. The correct answer is 4) vertebrae.