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Lower back muscles

by: Neil Keleher
Published: 2020 01 14
Categories/Tags: Lower back

Lower back muscles include muscles that attach directly to the lumbar spine. They also include muscles that cross the lumbar spine without actually connecting to the lumbar vertebrae.

Lower back muscles that attach to the front of the lumbar vertebrae (and sacrum)

Lower back muscles that attach directly to the front of the lumbar spine include the psoas, quadratus lumborum and the respiratory diaphragm.

Psoas

Lower back muscles: The psoas attaches to the lumbar bodies and intervening vertebral discs. It also attaches to the fronts of the lumbar transverse processes. It passes forwards and downwards from the lumbar spine, bends around the front of the hip bone and from there reaches back to attach to the lesser trochanter, at the top of the inner thighs inner surface, towards the back edge and just below the neck of the femur. The psoa Neil Keleher, Sensational Yoga Poses.
Lower back muscles: psoas muscle. The psoas attaches to the lumbar bodies and intervening vertebral discs. It also attaches to the fronts of the lumbar transverse processes. It passes forwards and downwards from the lumbar spine, bends around the front of the hip bone and from there reaches back to attach to the lesser trochanter, at the top of the inner thighs inner surface, towards the back edge and just below the neck of the femur. The psoa Neil Keleher, Sensational Yoga Poses.

Psoas crosses the front of the hip bone to attach to the femur.

Quadratus Lumborum

Lower back muscles: Quadratus lumborum muscle, viewed from the rear. The quadratus lumborum extends up from the hip bone to attach to the transverse processes of the upper four lumbar vertebrae. It also attaches to the lower rib. Neil Keleher, Sensational Yoga Poses.

Quadratus lumborum attaches to the lumbar vertebrae from the hip bone and also from the lowest pair of ribs.

Respiratory Diaphragm

Lower back muscles: The respiratory diaphragm attaches to the bottom circumferance of the ribcage. It also has attachments to the upper two or three lumbar vertebrae thus being able to affect the lower back. Neil Keleher, Sensational Yoga Poses.

The diaphragm attaches to the lumbar vertebrae from above.

Piriformis

Lower back muscles: piriformis. If we include the sacrum as part of the lower back, then we could think of the piriformis, which attaches to the front surface of the sacrum, as a lower back muscle also. Neil Keleher, Sensational Yoga Poses.

Note, if we include or think of the sacrum and coccyx as an extension of the lumbar spine, then we can also include the piriformis in this list.

Piriformis attaches to the front surface of the sacrum. It passes forwards and downwards through the greater sciatic notch at the back of the hip bone. From there it attaches to the femur.

Lower back muscles that attach to the back of the lumbar vertebrae (and sacrum)

Lower back muscles that attach directly to the back of the lumbar vertebrae includes the multifidus, the iliocostalis lumborum pars lumborum, the longissimus thoracis pars lumborum, the serratus posterior inferior and the latissimus dorsai.

Lumbar multifidus

Lower back muscles: Multifidus Neil Keleher, Sensational Yoga Poses.

The multifidus reaches upwards from the hip bones, sacrum and the mamilary processes to attach to the spinous process of a lumbar vertebrae two or more levels above.

Iliocostalis lumborum pars lumborum

Lower back muscles: Lumbar iliocostalis. Neil Keleher, Sensational Yoga Poses.

The iliocostalis lumborum pars lumborum is a subsection of the iliocostalis lumborum. This portion of the muscle extends upwards from the back of the hip crest to attach to the tips of the lumbar transverse processes.

Longissimus thoracis pars lumborum

Lower back muscles: Lumbar longissimus. Neil Keleher, Sensational Yoga Poses.

The longissimus thoracis pars lumborum is a subsection of the longissimus thoracis. It extends upwards from the back of the hip crest to attach to the lumbar transverse processes.

Serratus posterior inferior

Lower back muscles: The serratus posterior inferior attaches from the lower four ribs to the spinous processes of the lower two thoracic vertebrae and the upper two lumbar vertebrae. Shown here are the thoracic portion of the iliocostalis muscle. The serratus posterior inferior crosses behind this muscle. Neil Keleher, Sensational Yoga Poses.

The serratus posterior inferior reaches downwards and inwards from the bottom four pairs of ribs. It attaches to the lower two thoracic vertebrae. It also attaches to the spinous process of the upper two lumbar vertebrae.

Latissimus dorsai

Latissimus dorsai side view, show attaching to the humerus and from there to the lower three ribs, iliac crest and the spinous processes of the spine up to the middle thoracic vertebrae.

The lattisimus dorsai reaches down from the inner aspect of the humerous to attach to the spinous processes of the lumbar vertebrae. (It also has attachments to the hip bones, the spinous processes of the lower thoracic vertebrae and the lower three ribs.)

Gluteus maximus

Lower back muscles: if we include the sacrum as part of the lower back then the gluteus maximus, because of its attachments to the back of the sacrum, can be considered a lower back muscle. Neil Keleher, Sensational Yoga Poses.

Again, if we include the sacrum as part of the lumbar spine, then we can also include the gluteus maximus in this list of muscles.

As an added incentive to include the gluteus maximus as a lower back muscle, the latissimus dorsai has some fibers that cross the midline at about the level of the sacrum or L5 to blend with fibers of the opposite side gluteus maximus.

Lower back muscles: some fibers of the latissimus dorsai cross the midline at about the level of the sacrum or just above it to blend with fibers of the opposite side gluteus maximus. Neil Keleher, Sensational Yoga Poses.

Deeper muscles

There are also deeper muscles that attach between adjacent vertebrae. These include the intertransverse muscles which attach between the transverse processes of adjacent lumbar vertebrae and the interspinalis which attach between the spinous processes of adjacent lumbar vertebrae.

The transverse abdominis

Dividing the Transverse Abdominis into three parts, lower, middle and upper. Sensational yoga poses, neil keleher, anatomy for yoga teachers.

Another muscle that attaches directly to the lumbar vertebrae is the transverse abdominis. This muscle wraps around the waist from front to back. It's fibers pass behind the quadratus lumborum and psoas and in front of the longissimus and iliocostalis muscles.

Muscles that cross in front of the lower back

Muscles that cross in front of the lumbar spine include the internal obliques, external obliques and the rectus abdominis.

Lower back muscles: internal obliques, external obliques, fiber directions for internal and external obliques and intercostals, by Neil Keleher, sensational yoga poses.

The external obliques pass forwards downwards from the ribs to attach to the hip bone and the linea alba.

The internal obliques pass downwards and rearwards from the ribs to attach to the hip bones.

Muscles that cross in back of the lower back

Muscles that cross the back of the lumbar spine include the iliocostalis lumborum pars thoracis and longissimus thoracis pars thoracis.

Iliocostalis lumborum pars thoracis

Lower back muscles: Iliocostalis attaches from the back of the hip crest to the backs of the lower 6 or so ribs. Neil Keleher, Sensational Yoga Poses.

Iliocostalis lumborum pars thoracis is the thoracic subsection of the iliocostalis lumborum. This muscle extends upwards from the back of the hip crest to attach to the backs of the lower 9 ribs.

Longissimus thoracis pars thoracis

Lower back muscles: The thoracic portion of the longissimus has attachments at the lower end to the sacrum and the spinous processes of the lower lumbar vertebrae. The upper ends attach to the ribs, close to the vertebrae, and to the thoracic vertebrae themselves. Neil Keleher, Sensational Yoga Poses.

Longissimus thoracis pars thoracis is the thoracic component of the longissimus thoracis. It reaches upwards from the back of the sacrum, plus from the spinous processes of the lower three lumbar vertebrae to attach to the transverse processes of the thoracic vertebrae as well as the backs of the ribs.

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Learn to feel and control your spine, improve posture, breath control, ribcage control, with a taste of controlling your hip bones. Neil Keleher, Sensational Yoga Poses.