Sacral Region in the Body

Description

Posterior surface anatomy of the sacral region is presented on an adult Black male, with the midline contour of the sacrum and coccyx readable through the overlying skin and subcutaneous tissue. Superiorly, the sacral base sits just inferior to the L5 level, while laterally the sacroiliac regions align with the posterior superior iliac spines, often visible as paired dimples flanking the median sacral line. Inferior to the sacrum, the intergluteal cleft marks the transition toward the coccygeal tip and perianal region, with the bulk of gluteus maximus forming the buttock prominence on either side. Surface landmarks are clear. Clinical teaching often hinges on recognizing this triangle of bony reference points, because posterior pelvic pain frequently localizes around the sacroiliac joint rather than the lumbar spine, and palpation over the PSIS region helps guide diagnosis and injection planning. The midline lower sacrum and natal cleft also matter for pilonidal disease, where hair and friction at the superior intergluteal cleft lead to sinus formation that can be mistaken for perianal pathology. For procedures, the relationship between the distal sacrum, sacral hiatus, and coccyx underpins caudal epidural access and explains why obesity, atypical sacral cornua, or prior trauma can make landmark-based approaches unreliable. Ideal for gross anatomy and surface anatomy coursework covering the posterior trunk, pelvis, and gluteal region, this asset also fits orthopedic and pain-medicine publications discussing sacroiliac joint dysfunction, coccygodynia, or posterior pelvic fracture patterns. It can support patient-facing education on localization of low back versus buttock pain while representing a darker skin tone that is still underrepresented in anatomy references. Anatomical accuracy verified by SciePro's Medical Advisory Board.