[Anatomical study of human lumbar spine innervation]

Area of Science:

• Anatomy
• Neuroscience
• Orthopedics

Context:

• The innervation of the human lumbar spine is complex and not fully understood.
• Understanding these pathways is critical for diagnosing and treating spinal conditions, particularly low back pain.

Purpose:

• To investigate the detailed innervation of the human lumbar spine.
• To identify and describe the different types of nerve connections (rami communicantes) and their anatomical relationships.

Summary:

• Dissection of six adult cadavers revealed two types of rami communicantes (RC): superficial oblique rami (SOR) and deep transverse rami (DTR).
• SOR connected the sympathetic trunk to spinal nerves non-segmentally, while DTR ran segmentally along lumbar vessels.
• Both segmental and non-segmental sympathetic innervations were found to supply the anterior longitudinal ligaments, vertebral bodies, intervertebral discs, and posterior longitudinal ligaments.

Impact:

• This study elucidates the dual innervation of the lumbar spine, involving both segmental spinal nerves and non-segmental sympathetic nerves.
• The findings suggest a significant role for sympathetic nerves in the innervation of the spinal column and intervertebral discs.
• This knowledge may contribute to a better understanding of the mechanisms underlying discogenic low back pain.