Thoracolumbar Spine Anatomy and Pathology - Upper Sacrum (Young Female)

Sagittal Lumbar Spine Upper Sacrum of a Young Female

Sagittal section through the pedicles
Sagittal section through the pedicles of the same specimen as in SLIDE 1. Note the distinct texture of the lamellae of the lateral portion of the annulus fibrosus. Some areas of the endplates show a markedly concave configuration. The pedicles are relatively short in this specimen, causing the neuroforamina to assume an inverted teardrop shape. The important neurovascular structures are located in the "subpedicular notch" which corresponds to the deep incisura vertebralis inferior of the vertebral body. The foramen cross–section can be divided into a subpedicular (vertebral) portion and a disc or retrodiscal portion. The former is bounded by bone anteriorly and superiorly and by ligamentum flavum joint capsule posteriorly. The latter is frequently obliterated (especially at L4– L5) because the disc inserts into the upper aspect of the pedicle and physiologically "bulges" and because the ligamentum flavum attaches to the anterior surface of the superior articular process, thereby forming the capsule of the zygapophyseal or facet joint. This attachment usually extends to the upper surface of the pedicle. At L4 and L5 the dorsal root ganglia can be distinguished from the whiter and smaller ventral roots.


©2000 Wolfgang Rauschning, M.D., Ph.D.
Professor of Clinical Anatomy
Academic University Hospital
Department of Orthopaedic Surgery
Uppsala, Sweden
Reproduction without permission is prohibited

Updated on: 11/02/16

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