Anatomical Structure And Location Of The Coccygeal Horn

Description

Coccygeal cornua (coccygeal horns) rise from the dorsolateral aspect of the first coccygeal segment, just inferior to the apex of the sacrum. Each horn projects superiorly and slightly posteriorly toward the sacral cornua, framing the midline sacral hiatus and marking the posterior margin of the sacrococcygeal junction. From this fixed perspective, the paired processes sit lateral to the coccygeal midline, with their tips positioned to meet the sacral cornua across the posterior aspect of the sacrococcygeal joint. Small structures. Big landmarks. These horns matter because they are palpable and radiographically identifiable reference points for procedures and for localizing pain generators in coccydynia after a fall or childbirth-related trauma. Their relationship to the sacral hiatus and the posterior sacrococcygeal ligaments helps explain why inflammation or subluxation at the sacrococcygeal joint can produce focal tenderness just inferior to the sacral apex, while also guiding needle placement for caudal epidural access when surface anatomy is challenging. Bony contour and edge definition in the image make the cornua easy to distinguish from the coccygeal transverse processes and from irregular coccygeal fusion variants. Use this illustration in gross anatomy and osteology teaching when introducing the sacrum, coccyx (tailbone), and posterior pelvic landmarks, or in pain medicine, sports medicine, and orthopedics materials covering coccygeal fractures, sacrococcygeal joint arthropathy, and targeted injection technique planning. It also supports radiology and anatomy atlas labeling for sacral cornua, coccygeal cornua, and the sacral hiatus on lateral and oblique studies. Anatomical accuracy verified by SciePro's Medical Advisory Board.