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Body Region

Lower Back

All anatomical structures in the Lower Back region

39 entries

All Types 39 Muscles 15 Bones 3 Ligaments 13 Nerves 1 Bursae 1 Joints 6

39 entries

Ligament Anterior Annular Fibres (Lumbar Disc) fibrae anuli fibrosi anteriores (discus intervertebralis lumbalis) Lower Back The lumbar annulus fibrosus consists of 15-20 concentric lamellae of type I collagen with alternating fibre… Ligament Anterior Longitudinal Ligament (Lumbar) ligamentum longitudinale anterius (lumbale) Lower Back The lumbar ALL is a broad, thick band firmly adherent to the anterior vertebral bodies and… Muscle Erector Spinae musculus erector spinae Lower Back The erector spinae is not a single muscle but a column of three parallel muscle groups,… Ligament Flavum Ligament (Lumbar) ligamentum flavum lumbale Lower Back The lumbar ligamentum flavum is the thickest and most clinically significant portion of the flavum, forming… Muscle Iliocostalis (Full) musculus iliocostalis (pars erectoris spinae) Lower Back The iliocostalis is the most lateral column of the erector spinae, running from the iliac crest… Muscle Iliocostalis Lumborum musculus iliocostalis lumborum Lower Back The iliocostalis lumborum is the lumbar portion of the iliocostalis, forming the most lateral column of… Ligament Iliolumbar Ligament ligamentum Lower Back The iliolumbar ligament connects the L5 (and L4) transverse processes to the iliac crest, acting as… Ligament Iliolumbar Ligament ligamentum iliolumbale Lower Back The iliolumbar ligament spans the L4-L5 transverse processes to the iliac crest, providing the primary bony… Ligament Iliolumbar Ligament (Full) ligamentum iliolumbale Lower Back The iliolumbar ligament is the primary restraint at the lumbosacral junction, connecting the L5 transverse process… Muscle Interspinales (Lumbar) musculi interspinales lumborum Lower Back The lumbar interspinales are paired small muscles flanking the interspinous ligament between adjacent spinous processes. They… Bursa Interspinous Bursae bursae interspinales Lower Back Interspinous bursae are adventitial bursae that develop between adjacent spinous processes, most commonly in the lumbar… Muscle Intertransversarii (Lumbar) musculi intertransversarii lumborum Lower Back The lumbar intertransversarii connect adjacent lumbar transverse processes and, like the rotatores, are thought to serve… Ligament Intertransverse Ligaments — Lumbar ligamenta intertransversaria lumborum Lower Back The lumbar intertransverse ligaments are thin membranous structures connecting adjacent transverse processes, providing coronal plane stability… Bone L1-L5 Vertebrae (Lumbar) vertebrae lumbales (L1-L5) Lower Back The five lumbar vertebrae have the largest bodies of the spinal column (accepting the highest axial… Ligament Ligamentum Flavum (Lumbar) — Detail ligamentum flavum (lumbale) Lower Back The lumbar ligamentum flavum is the thickest in the spine (3-5 mm normal), reflecting the highest… Muscle Longissimus (Full) musculus longissimus (pars erectoris spinae) Lower Back The longissimus is the intermediate and longest column of the erector spinae, running from the common… Ligament Lumbar Facet Capsular Ligaments ligamenta capsularia articulationum zygapophysialium lumborum Lower Back The lumbar facet capsular ligaments at each level from L1-L2 through L5-S1 restrain the coupled rotation-lateral… Joint Lumbar Facet Joints (Detail) articulationes zygapophysiales lumborum (detail) Lower Back The lumbar zygapophyseal joints have a sagittal orientation (superior-inferior) that allows flexion-extension while severely limiting rotation… Ligament Lumbar Interspinous Ligaments (Detail) ligamenta interspinalia lumborum Lower Back The lumbar interspinous ligaments are the thickest in the spine, resisting the highest flexion loads at… Joint Lumbar Intervertebral Disc (L4-L5) discus intervertebralis L4-L5 Lower Back The L4-L5 intervertebral disc is the most commonly herniated disc in the lumbar spine, with the… Joint Lumbar Intervertebral Disc (L5-S1) discus intervertebralis L5-S1 Lower Back The L5-S1 disc is the most highly loaded lumbar disc, accepting the greatest mechanical stress from… Ligament Lumbar Supraspinous Ligament ligamentum supraspinale lumborum Lower Back The lumbar supraspinous ligament connects the lumbar spinous process tips, forming the outermost posterior passive restraint.… Bone Lumbar Vertebral Body corpus vertebrae lumbalis Lower Back The lumbar vertebral bodies are the largest in the mobile spine, supporting the full weight of… Joint Lumbar Vertebral Facet Joints articulationes zygapophysiales lumborum Lower Back Lumbar facet joints face sagittally, enabling the lumbar spine's primary flexion-extension motion while resisting the rotation…