Final answer:
Zygapophysial joints, also known as facet joints, are the synovial joints that articulate the vertebrae in the vertebral column. These plane joints provide limited motion between the vertebrae. The orientation of the articular processes in different regions of the vertebral column determines the types of motions available in each region.
Step-by-step explanation:
The articulations of the vertebral column are formed by synovial joints called zygapophysial joints or facet joints. These joints are formed between the superior and inferior articular processes of adjacent vertebrae. They are plane joints that provide limited motion between the vertebrae. The orientation of the articular processes in different regions of the vertebral column determines the types of motions available in each region.