Anatomical position and joint formation
The anatomical structure of the spinal column involves close interaction between adjacent vertebrae. The superior articular process (processus articularis superior) of one vertebra articulates with the inferior articular process of the vertebra above it, forming paired facet joints.
The spatial arrangement of these processes varies depending on the region of the spine:
- In the cervical and thoracic regions, the inferior articular process lies posterior (dorsally) to the superior one.
- In the lumbar region, the inferior articular process is located closer to the midline (medially) relative to the superior articular process of the underlying vertebra.
Role in the structure of the spinal segment
Each spinal motion segment is a complex biomechanical system. In addition to vertebral bodies and discs, it includes zygapophysial joints formed by the articular processes. For example, in the diagram of the spinal segment structure, the superior articular process (processus articularis superior) lies adjacent to the ligamentum flavum (ligamentum flavum), spinous process, and intervertebral disc, ensuring stability and a specific range of motion for the entire region.
Pathological changes and clinical significance
The condition of the facet joints and their articulating surfaces directly affects spinal health. The main pathological processes include:
- Lumbar spondylosis — a degenerative process affecting the intervertebral discs and zygapophysial joints.
- Tissue hypertrophy — overgrowth of tissues and joint elements, leading to narrowing of the spinal canal.
- Spondylolisthesis — degeneration of the facet joint capsule and disc, causing instability and displacement of the vertebral bodies.
These changes cause compression of neural structures, manifesting as pain, numbness in the legs, and muscle weakness.
The superior process is always superior and receives the inferior one: in the lumbar region, the inferior is medial and the superior is lateral.
Class and exam questions
What is the superior articular process and what function does it perform?
This is a bony element of the vertebra (processus articularis superior) that participates in the formation of the facet (zygapophysial) joint by articulating with the inferior articular process of the overlying vertebra.
How are the articular processes arranged in the lumbar region?
In the lumbar region, the inferior articular process of the overlying vertebra is located medially (closer to the midline) relative to the superior articular process of the underlying vertebra.
What pathologies are caused by changes in the facet joints?
Degeneration of the facet joint capsule and articular processes can cause lumbar spondylosis, spinal stenosis, and spondylolisthesis, accompanied by nerve root compression.
What else to study on this topic
- Anatomy of zygapophysial joints (articulatio zygapophysialis)
- Structure of the lumbar vertebrae (L1–L5)
- Pathogenesis of lumbar spondylosis and spinal stenosis
- Biomechanics and stability of the spinal segment
- Clinical manifestations of nerve root compression in spondylolisthesis
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