A neurosurgeon performing a cervical laminectomy encounters the ligamentum flavum. Which histological feature distinguishes the ligamentum flavum from all other spinal ligaments?
- A Predominantly collagen type I fibers
- B Highest elastin content (approximately 80% of dry weight) ✓
- C Rich vascular supply with arterioles
- D Presence of fibrocartilage at bony attachments
Correct answer: B. Highest elastin content (approximately 80% of dry weight)
Explanation
The ligamentum flavum has the highest elastin content of any ligament in the body, approximately 80% of dry weight compared to about 20% in most other ligaments. This high elastin content gives it the yellow color (flavum means yellow) and allows it to maintain tension on the spinal canal during flexion without buckling excessively. Elastin deficiency contributes to hypertrophy and buckling in spinal stenosis.
Reference: Gray's Anatomy, 42nd ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.