Flashcards in Ligamentum Flavum Deck (18)
What is the classification of the ligamentum flavum-lamina joint?
fibrous (amphiarthrosis) syndesmosis
What vertebral levels will the ligamentum flavum be attached to?
those between C2 and S1 inclusive
What are the specific bony attaching sites for the ligamentum flavum?
What will the ligamentum flavum attach to in addition to the lamina?
they may blend with the capsular ligament of the zygapophysis
How many ligamenta flava will attach to the lamina of a cervical segment?
two: one with the upper margin of the lamina and one with the lower margin
In which region of the spine will the ligamentum flavum be paired?
the lumbar spine
How many ligamenta flava will attach to the lamina of a lumbar segment?
four: two with the upper margin of the lamina and two with the lower margin
What is the relationship of the ligamentum flavum to the vertebral foramen?
it forms the posterior boundary of the spinal canal
What is the histology of the ligamentum flavum?
it is formed primarily with elastic fibers, which are yellow in appearance
What is the color of the ligamentum flavum?
What is the name given to the ligamentum flavum based on appearance and histology?
it is a yellow elastic ligament
What fibers are most ligaments made up of?
collagen type I fibers which are whitish in appearance
What is the function of the ligamentum flavum?
it brakes or limits flexion of the vertebral column
What is now thought to be a major function of the ligamentum flavum?
it is an early prime factor in extension of the vertebral column
How is the ligamentum flavum thought to be important in extension?
it is thought to store energy in the elastic fiber upon dorsi-flexion and initiates extension (straightening of the vertebral column) via energy release from the elastic fiber and involvement in the spinal reflex to muscles coordinating extension
What is the result of cervical hyperextension on the ligamentum flavum?
it bulges the ligamentum flavum into the spinal canal, which may compress the spinal canal
Where is ossification of the ligamentum flavum most commonly identified?
the thoracic spine or thoracolumbar transition zone