The joints between the adjacent processes of the vertebrae (specifically the facet joints or zygapophyseal joints) are classified as sliding joints (also known as gliding or plane joints). These joints consist of flat or nearly flat articular surfaces that allow the bones to slide or glide over one another, providing the flexibility needed for the spine to bend and twist while maintaining stability.
A. hinge joint: These allow movement in only one plane, like a door. While some specialized spinal junctions in certain animals are described as hinge-like, the standard classification for human intervertebral facet joints is sliding/gliding.
B. ball and socket joint: These provide the highest range of motion and are found in the shoulders and hips, where a rounded bone head fits into a cup-like depression.
C. suture joint: These are immovable fibrous joints found only between the bones of the skull.
There is an explanation video available below.
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