Male Sacral Region, Posterior View

Description

Posterior surface anatomy of the male sacral region is centered on the sacrum and coccyx along the midline, with the median sacral crest palpable beneath the skin between the posterior superior iliac spines (PSIS). Laterally, the sacral surface contours into the gluteal region, where the posterior iliac crests frame the superior boundary and the gluteal cleft marks the inferior midline transition toward the perineum. Overlying soft tissues define the classic “saddle” distribution across the lower sacrum and adjacent buttocks, a useful external reference for the posterior pelvic midline. Clinically, this posterior sacral view matters because it ties palpable landmarks to high-yield neurocutaneous territory and procedural corridors. The saddle area corresponds to S2 to S4 dermatomes, so altered sensation here raises concern for cauda equina syndrome, conus medullaris lesions, or sacral radiculopathy and prompts urgent correlation with bowel and bladder function. These same landmarks guide needle trajectories for caudal epidural anesthesia via the sacral hiatus (inferior to the sacrum, just superior to the coccyx) and help localize pain patterns from sacroiliac joint dysfunction versus coccygodynia. Use this artwork for gross anatomy and neuroanatomy teaching on posterior pelvic landmarks, dermatomes, and surface mapping of the sacrum and coccyx, and for clinical skills materials covering caudal epidural approach, sacral palpation, and documentation of perineal sensory loss in emergency and spine settings. It also fits well in orthopedic, neurosurgical, and pain medicine publications discussing low back pain, sacroiliac pathology, and red-flag saddle anesthesia. Anatomical accuracy verified by SciePro's Medical Advisory Board.