16/11/2025
Vertebrae articulate (connect/join) with each other through two main types of joints
1: Between the vertebral bodies, separated by an intervertebral disc, which acts as a shock absorber. Each disc is made of a soft, gel-like center (nucleus pulposus) and a tough outer ring (annulus fibrosus).
These discs act as “cartilaginous joints” to cushion the spine and bear weight, allowing for some gliding movement between vertebrae.
Cartilaginous joints are a type of joint where bones are connected by cartilage, allowing for more movement than fibrous joints but less than synovial joints.
The joints between the vertebral bodies are supported by strong ligaments, such as the anterior and posterior longitudinal ligaments.
2: Between the vertebral arches, forming two facet joints (or zygapophyseal joints) to provide stability and allow for movement.
These facet joints are paired joints (two-per-vertebra, one on each side) that connect the superior (top) articular process of one vertebra with the inferior (bottom) articular process of the one below it.
Facet joints are “synovial joints”.
A synovial joint is a freely movable joint in the body. They are lined with hyaline cartilage and enclosed by a joint capsule with a joint cavity inside the capsule which is filled with lubricating synovial fluid.
These synovial joints, which also include the shoulder, knee, and hip, are enclosed by a joint capsule and have articular cartilage covering the bone ends to reduce friction and absorb shock.
(In case of the spine, as described above with the joint between the vertebral bodies)
They allow for gliding movements, with the exact movement permitted depending on the region of the spine and the orientation of the joint surfaces.
The facet joints of the spine are supported by ligaments such as the ligamentum flavum and interspinous and supraspinous ligaments.