learn about Anatomy of lumbar spine. gain more knowledge about lumber spine briefly in short time.

1. Submitted To – Submitted By -
DR. Monika awasthi (PT) Nishant kumar gaurav
H.O.D of physiotherapy department B.P.T 2nd year
S.C.M.A.T

3.  The lumber spine consist of vertebral body, posterior
elements, intervertebral disks, and ligament.
 Made up of the five lumber vertebrae located between
the thoracic spine and sacrum.
 Area is commonly called the “lower back”.
 The lumber vertebrae are the largest of the vertebra
because of their weight bearing function supporting
the torso and head.

5. Body
Pedicle
Lamina
Spinous process
Transverse process
Spinous process
Mamillary process
Zyagapophyseal articular process
Vertebral foremen
Intervertebral disk

6. BODY
• Body of typical lumber vertebra is massive.
• Transverse diameter is greater then the
anteroposterior diameter and greater then the
height.
• Support great compressive loads.
Pedicles : short and thick an projected
posterolaterally.
Laminae : short and broad.
Transverse process : long, slender, extends
horizontally.

7. Accessory process : small, irregular bony
prominences, location on posterior surface of
transverse process near its attachment to the
pedicle.
Spinous process : broad, thick, extends
horizontally.
Mamillary processes : located on posterior edge of
each superior zygapophyseal facet.
Zygapophyseal articular process (facets) :
Superior and inferior; vary in shape and
orientation.
Vertebral foramen : triangular, larger then thoracic
vertebral foramen but smaller then cervical
vertebral foramen.

9. Intervertebral Disc
• Largest
• Collagen fibers of anulusa fibrosus are arranged in
sheet: lamellae
• Concentric rings surrounding nucleus.
• Resist tensile forces in nearly all directions.
• Shape of each disk is purely elliptical but concave
Posteriorly.
• Provide greater cross-section area of anulus fibrosus
Posteriorly and hence increased ability to resist
tension that occur with forward bending.

11. Interbody joints
• Capable of translations and tilts in all direction.

12. Zygapophyseal joint
• True synovial joints
• Fibroadipose meniscoid structures
• Facet joint capsule restrains axial rotation
• Resistance to anterior shear

13. Lumbosacral joint
• 5th lumber vertebra and 1st sacral segment.
• 1st sacral segment is inclined slightly anteriorly and
inferiorly, forms an angle with horizontal:
Lumbosacral angle.

14. Supraspinous ligament
• Well developed only in upper lumber region
• Most common termination site – L4
• May terminate at l3
Intertransverse ligament
• Not true ligament in lumber area and are replace by
the iliolumbar ligament at L4
Interspinous ligament
• Least overall stiffness and joint capsule the highest

15. Anterior longitudinal
ligament
• Strong and well developed in
this area.
Posterior longitudinal
ligament
• Only a thin ribbon in lumber
region, whereas ligamentum
flavum is thickened here.

16. Iliolumber ligaments
• Series of bands from tips and borders of transverse
processes of L4 and L5 to attach bilateral on iliac crests
of pelvis.
• 3 borders : Ventral / anterior
Dorsal / posterior
Sacral

18. MOVEMENT MUSCLE
Lumber Flexion (Approx 55 degrees)
•Oblique externus abdominius
•Oblique internus abdominius
•Transversus abdominius
•Rectus abdominius
•Psoas major
•Psoas minor
Lumber Extension (Approx 30
degrees)
•Quadratus lumborum
•Sacrospinalis
•Interteransversarii
•Multifidis
•Erector spinae
•interspinalis
Lateral flexion of lumber
•Quadratus lumborum
•Erector spinae
•Psoas major
•Psoas minor
Rotation of lumber

20. The lumber region is a common site of a number of
developmental deformities.
Some diseases are :-
 Cauda equina syndrome
 Posterolateral disc prolapse
 Lumber lordosis

21. Content by : -
• B D Chaurasia (human anatomy) {page no. -203 to 206}
• Cynthia C. Norkin ( joint structure and function)
{page no. – 164 to 169}
Images by : -
• Google image