Complete Morphological Structure of the Intervertebral Disc

Description

Centered on a single vertebral body in superior aspect, the intervertebral disc sits directly on the cranial endplate, its circumference matching the peripheral ring apophysis of the vertebra. Concentric lamellae of the annulus fibrosus form the outer fibrocartilaginous ring, while the nucleus pulposus occupies a more central position, slightly posterior in many adult discs relative to the vertebral body midline. Cortical margins of the vertebral body and the trabecular core are suggested beneath the endplate interface, clarifying where disc tissue transitions to bone. Small openings are indicated within the vertebra, consistent with nutrient foramina rather than the intervertebral foramina, which are formed between adjacent vertebrae. Morphology matters here because disc failure is rarely a single-tissue problem; annular fissures, endplate defects, and nucleus dehydration interact and dictate where herniation or discogenic pain originates. The clear separation of annulus and nucleus supports teaching the typical posterolateral route of nucleus pulposus extrusion, where the annulus is thinner and the posterior longitudinal ligament provides incomplete containment. That clinical pathway underpins common lumbar radiculopathy patterns and guides how radiologists read focal high-intensity zones on MRI and how surgeons plan microdiscectomy trajectories. Use this artwork in spine anatomy and biomechanics lectures, histology modules covering fibrocartilage, and clinical teaching files that pair gross morphology with MRI or CT disc degeneration grading. It also suits textbook chapters on intervertebral disc herniation, Modic endplate change, and annular tear mechanisms, where a clean, labeled morphology plate saves space and reduces explanatory text. Anatomical accuracy verified by SciePro's Medical Advisory Board.