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Psoas Major
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The psoas major, the body's main engine of walking, is one of three muscles that make up the
iliopsoas muscle group. The psoas major inserts on the back half of the inner thigh, comes
forward to cross over the rim of the pelvis and moves backwards again to attach along the
lumbar or lower spine. The iliacus muscle lines the inside wall of the pelvis and joins psoas
major to form a common tendon inserting together on the back half of the inner thigh. Psoas
minor is an interesting muscle that anatomy books will tell you it is present in only 50% of
people and is slowly disappearing. Though this is technically true the body has many different
connections, one of them being through fascia, a connective tissue that we will go into in future
articles. So even if you don't have this muscle it is likely to manifest energetically through the
fascial lines of the body. Bodyworkers often refer to feeling this muscle whether it is there or
not.
Psoas major attaches at six points, the back of the inner thigh and then five different points along
the spine. The first four vertebrae of the lumbar spine, which is the lower back, and the bottom
vertebrae of the thoracic spine; which is anything that includes a rib. (T12). As a result the psoas
spans and affects many joints as opposed to the iliacus, for example, which only crosses the one
joint where the leg meets the pelvis.
The psoas is unique for many reasons.
Only two muscles connect the legs to the spine. The psoas major and the piriformis.
57 muscles attach on the pelvis. The psoas, which doesn't attach to the pelvis, is arguably more
influential in regards to the pelvis than any of them.
Your psoas is intimately connected to breathing as the diaphragm muscle, the main muscle of
respiration, has ligaments that wrap around the top of the psoas and two long attachments, called
crura, that come down to insert on the first three vertebrae of the lower spine. This means that
every breath resonates in some way with the psoas and the movement of the psoas can have great
influence on the breath.
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The Psoas moves in more than one direction as it comes diagonally forward to cross over the rim
of the pelvis and then moves straight up to connect to the lumbar spine. This allows the psoas to
work like a pulley system increasing the natural force that it can generate.
The psoas is the main muscle of walking. Walking is a full body experience initiated in the trunk
and extending out through the extremities. The psoas from the deepest core moves the legs rather
than the legs moving the body. In a weird way you can say the leg begins up at the top of the
psoas as truly fluid movement in walking is felt as a pendulum like release from the base of the
rib cage at T12.
The Psoas is the body's main hip flexor which is why it is the main muscle of walking but it
plays a deeper maybe more important role as a flexor. Flexion is the one of the ways we manifest
our distress, fear and trauma. Our inability to process these experiences and emotions create
imbalances that often affect the psoas. For certain extreme cases it is like living in a state of
constant flexion.
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