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Anatomy of the Lumbar Spine. Physician Name Physician Institution Date. Lumbar Anatomy. 5 vertebrae L1-L5 5 intervertebral discs 5 pair of exiting nerve roots Lumbar lordosis L1-S1 ranges from 30°–80° The apex of lumbar lordosis L3-L4. 1. 2. 3. 4. 5. Sacral Anatomy.

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anatomy of the lumbar spine

Anatomy of the Lumbar Spine

Physician Name

Physician Institution

Date

lumbar anatomy
Lumbar Anatomy
  • 5 vertebrae L1-L5
  • 5 intervertebral discs
  • 5 pair of exiting nerve roots
  • Lumbar lordosis L1-S1 ranges from 30°–80°
    • The apex of lumbar lordosis L3-L4

1

2

3

4

5

sacral anatomy
Sacral Anatomy
  • The sacrum is a series of 3, 4, or 5 fused coccygeal vertebrae
  • The coccyx articulates with the inferior aspect of the sacrum

1

2

3

4

C

lumbar spine anatomy

Superior

A Lateral P

Superior

Posterior (oblique)

Anterior (oblique)

Lumbar Spine Anatomy
  • Typical lumbar vertebra (L2)
    • Body
    • Vertebral foramen/canal
    • Intervertebral foramen
    • Pedicle
    • Transverse process
    • Lamina
    • Spinous process
    • Facet joints
    • Pars interarticularis

inferior

superior

Inferior

lumbar spine anatomy5

2

Lumbar Spine Anatomy
  • Ligaments
    • Anterior longitudinal ligament
    • Posterior longitudinal ligament
    • Ligamentum flavum
    • Interspinous ligaments
    • Supraspinous ligament
    • Intertransverse ligaments

1

6

5

4

3

lumbar spine anatomy nerve structures
Lumbar Spine Anatomy: Nerve Structures
  • The spinal cord and nerve roots are often affected by skeletal problems
  • Discs and bony tissue can interfere with normal nerve function and cause pain
lumbar spine anatomy nerve structures7
Lumbar Spine Anatomy: Nerve Structures
  • Conus medularis
  • The point at which the thick, single strand of the spinal cord ends
  • Typically at T12 or L1

Note: in this illustration, the posterior elements of the spine, along with the dura mater and arachnoid mater, are not shown.

lumbar spine anatomy nerve structures8
Lumbar Spine Anatomy: Nerve Structures
  • Cauda equina
  • The point at which individual nerve roots continue down through the spinal canal

Note: in this illustration, the posterior elements of the spine, along with the dura mater and arachnoid mater, are not shown.

lumbar spine anatomy nerve structures9
Lumbar Spine Anatomy: Nerve Structures
  • Exiting nerve root
  • Passes medial to the pedicle of the anatomic segment
  • Traversing nerve root
  • Passes across the disc space and beneath the pedicles of the inferior segment

Note: in this illustration, the posterior elements of the spine, along with the dura mater and arachnoid mater, are not shown.

lumbar spine anatomy vascular structures
Lumbar Spine Anatomy: Vascular Structures
  • The aorta and vena cava bifurcate around the level of the L3/L4 disc space
    • Aorta
    • Vena cava
    • Iliac arteries
    • Iliac veins
    • Midsacral vessels