This is a Latin phrase that means a part between two joints. In the lumbar spine it is part of the lamina of the back of the vertebral bone and it is commonly broken. A broken pars interarticularis is called a spondylolysis. If painful, a fusion may be needed to fix this.
a posterior bony structure between two adjacent facet joints in the lumbar spine. This structure is stressed and may fracture with extension and rotation of the lumbar spine.
The area between the upper and lower articulating (joining) facets of two vertebrae.
The part of a vertebra between the lamina and the superior facet; this may be abnormal in the condition called spondylolysis.
A fibrous defect in the neural arch where there is loss of bony continuity of the arch.