One part of the body of particular interest in yoga is the spine. To undertand why a healthy spine is crucial to our health, it is important to know a little about the structure of our bodies, of the spine, and the movements the spine can make.
Our head houses our brain which is crucial in controlling almost all the voluntary and involuntary processes in our bodies. The brain is connected to the spinal cord which is connected to the rest of the nerves throughout the body. The brain, the spinal cord, and the peripheral nerves are soft and are easily injured or damaged; therefore the body has a mechanism to protect the nervous system, the skeleton. The brain is protected by a hard bone casing, the skull, which sits on top of the neck or cervical spine. The spinal cord is protected within the bony spinal vertebrae.
The spinal column is made up of vertebrae stacked on top of one another with intervening softer cartilage between the stacked vertebrae. This combination of both hard and soft tissue allows for maximum protection of the spinal cord while allowing for flexibility and range of movement. Ligaments are also found holding the vertebrae together on all sides of the spine.
Together the bony vertebrae, the cartilage, and the ligaments make the spine self-supporting. If you were to remove all the muscles and tendons surrounding the spine, it would not collapse but remain in a neutral position. Furthermore any muscular or other forceful actions that move the spine away from a neutral position require energy, and when the muscles are relaxed the spine naturally moves back to a neutral position.
The neutral position of the spine changes as we age but once we are teenagers, our spines have the general adult structure with primary and secondary curves. There are two primary curves of the spine at the sacral and thoracic spine, curving forward. The two secondary curves of the spine are at the lumbar and cervical regions, curving backward.
There are four types of common spinal movements, extension, flexion, lateral flexion (side bending), and axial rotation (twisting).
Extended Warrior I provides extension of the spine.
Flexion is a movement of the spine that emphasizes the primary curve of the spine as in the the thoracic spine. A gentle pose that demonstrates flexion is child’s pose.
Extension of the spine is any movement that emphasizes the secondary curve of the spine, like in the lumbar region. An example of spinal extension in Yoga posture practice is Warrior I or Extended Warrior I.
Lateral flexion is side bending of the spine in one direction or another which extends the distance between the vertebrae on one side. Head tilts to each shoulder create lateral flexion in the cervical vertebrae.
Axial rotation involves the action of twisting the vertebrae relative to each other. Actions such as turning our heads to the sides adds rotation to only the cervical spine. Yoga poses such as supine twist are axial rotation for the entire spine.
There is one final action of the spine we do not commonly do, axial extension. Instead of accentuating one curve of the spine or another, we actually try to straighten all the curves of the spine and lengthen the back. One yoga posture in which we actively practice axial extension is tadanasa or mountain pose.
The movement of the spine is intrinsically connected with our breathing. No matter how you are sitting, take a few deep breaths and note the subtle movements of the spine. On the inhale you are decreasing the primary curve and enhancing the secondary curve of the spine, extension. On the exhale the primary curve is increasing while the secondary curve of the spine is decreasing, flexion.
Kaminoff, Leslie. Yoga Anatomy. Champaign, IL: Human Kinetics, 2007. Print.
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