What is a primary function of the ligamentum flavum?

What is a primary function of the ligamentum flavum?

• A. Flexion of the spine (limits extension)
• B. Extension of the spine (limits flexion)
• C. Stabilizes lateral bending
• D. Rotational stability

Answer: (B)

Ligamentum flavum is rich in elastic fibers and runs between the laminae of adjacent vertebrae, forming the posterior wall of the spinal canal. Its elasticity means it is stretched when the spine flexes, which helps limit how far flexion can go. As it recoils, it assists the spine in returning toward neutral and ultimately extending from a flexed position. So its primary role is to limit flexion and support extension, rather than actively stabilize lateral bending or rotational movements.

Ligamentum flavum is rich in elastic fibers and runs between the laminae of adjacent vertebrae, forming the posterior wall of the spinal canal. Its elasticity means it is stretched when the spine flexes, which helps limit how far flexion can go. As it recoils, it assists the spine in returning toward neutral and ultimately extending from a flexed position. So its primary role is to limit flexion and support extension, rather than actively stabilize lateral bending or rotational movements.