The Gross Anatomy Of The Coccygeus Muscle Of A Human Male

Description

Arising from the ischial spine, the coccygeus muscle (ischiococcygeus) fans medially and posteriorly toward the lateral margins of the inferior sacrum and coccyx, forming a thin muscular sheet that lies superior to the pelvic floor. Along its inferior surface it relates closely to levator ani, while its superior surface faces the pelvic cavity and pelvic fascia. Posterolaterally, the sacrospinous ligament runs with and often blends into coccygeus, spanning from the ischial spine to the sacrum and coccyx as a firm landmark deep to the gluteal region. Coccygeus is easy to overlook in dissection because of its variable muscle content and its near continuity with the sacrospinous ligament, but the relationship matters when teaching the boundaries of the lesser sciatic foramen and the route of the pudendal nerve and internal pudendal vessels as they hook around the ischial spine. Entrapment or irritation near the ischial spine, including pudendal neuralgia, is often discussed with reference to the sacrospinous and sacrotuberous ligaments rather than the muscle itself, so showing the blended anatomy helps clarify where needle placement or surgical dissection can go wrong. A small muscle. A big landmark. Faculty can drop this plate into male pelvis modules, pelvic floor labs, and prosection guides to reinforce the deep posterior pelvic wall and its ligamentous landmarks. It also suits operative anatomy figures for sacrospinous ligament fixation, perineal pain pathways, and pelvic pain chapters in urology, colorectal, and gynecologic texts, even when the focus is not on the coccyx itself. Anatomical accuracy verified by SciePro's Medical Advisory Board.