Medial Branches of the Dorsal Rami, Posterior View

Description

Running along the posterior thoracic and lumbar spine, the dorsal rami exit the intervertebral foramina and divide into medial and lateral branches that course across the laminae and transverse processes. Medial branches track closer to the spinous processes, passing in a deeper plane beneath the thoracolumbar fascia and the overlying erector spinae, while the lateral filaments remain more peripheral over the rib angles and posterolateral trunk. Scapulae overlie the upper thorax, ribs curve laterally from the thoracic vertebrae, and the superior pelvis frames the inferior field. Medial branches of the dorsal rami matter because they supply the zygapophysial (facet) joints via articular twigs and innervate the deep paraspinal musculature and overlying skin in a segmental pattern. This posterior perspective mirrors the anatomy targeted during lumbar medial branch blocks and radiofrequency neurotomy, where needle placement relies on bony landmarks such as the junction of the superior articular process and transverse process in the lumbar spine. Small nerves, big consequences. Educators can drop this plate directly into a spine anatomy lab, a pain medicine lecture on facetogenic low back pain, or a surgical anatomy chapter that contrasts dorsal versus ventral rami and their cutaneous fields. Publishers will also find it useful for procedural guides that need to explain why medial branches run deeper than lateral branches and how that relationship affects dissection planes and injection trajectories. Anatomical accuracy verified by SciePro's Medical Advisory Board.