Coccygeal Horn In A Posterior View Of The Coccyx

Description

Coccygeal cornua project superiorly from the dorsolateral margin of the first coccygeal segment (Co1), framing the midline on a posterior view of the coccyx (tailbone). Each horn-like cornu sits just inferior to the sacral hiatus and aligns with the sacral cornua, forming the paired bony landmarks that border the dorsal aspect of the sacrococcygeal articulation. Inferiorly, the remaining coccygeal segments taper toward the apex, with the posterior surface showing the roughened attachment area for the anococcygeal ligament and fibers of gluteus maximus. Pain at the tailbone is often localized by palpating these posterior landmarks, and post-traumatic coccydynia can relate to subluxation or degenerative change at the sacrococcygeal joint where the coccygeal horns approximate the sacral horns. Fracture fragments or osteophytic spurs along the dorsal coccyx can irritate adjacent soft tissues and complicate sitting pain, while anatomic variation in cornua size and symmetry explains why tenderness is sometimes unilateral. The fixed posterior perspective is the one clinicians use when orienting to the dorsal midline for examination, and it clarifies the relationship between the cornua and the superior coccygeal base without distraction from pelvic organs. Use this illustration in gross anatomy lab guides, orthopedic or sports medicine teaching on coccygeal injury, and radiology correlation figures that explain why the coccygeal cornua can be hard to separate from sacral horns on lateral or oblique studies. Anatomical accuracy verified by SciePro's Medical Advisory Board.