Which nerve root exits at the L4 vertebra level?

• A. L2
• B. L3
• C. L4
• D. L5

Answer: (C)

The L4 vertebral level corresponds to the exit point of the L4 nerve root. In the vertebral column, each spinal nerve root exits at the level of the corresponding vertebra, so the L4 nerve root exits between the L4 and L5 vertebrae, specifically exiting at the L4 foramen.

This understanding is fundamental in anatomy, particularly when assessing conditions such as radiculopathy, where specific nerve roots may be compressed or irritated, leading to symptoms in specific dermatomes or myotomes. Knowing that the L4 nerve root exits at the L4 level is crucial for recognizing potential nerve issues in the L4-L5 region, especially in clinical practice where nerve root levels guide assessment and intervention strategies.

When differentiating between the nerve roots, it is important to visualize the anatomical structure of the spine and how each nerve root corresponds directly to its respective vertebra, which is key for diagnosis and treatment planning.