INTERSEGMENTAL ARC REFLEX

Intersegmental Arc Reflex: A Review of its Role in Postural and Motor Control

The intersegmental arc reflex (IAR) is an important component of postural control and locomotion and is essential for normal gait and balance. The IAR is a neural circuit that links the spinal cord and the brain, and is responsible for coordinating the impulses from the spinal cord to the brain. The IAR plays an important role in the control of posture, as well as the coordination of movement.

The IAR is composed of two major components: a sensory pathway, which transmits sensory information from the periphery to the spinal cord, and a motor pathway, which transmits motor commands from the spinal cord to the brain. The IAR is a reflex circuit, which means that it is activated when a sensory stimulus is detected in the periphery. The sensory information is then transmitted to the spinal cord and the brain, which in turn activate the motor pathway. The motor pathway then sends the appropriate motor commands to the muscles, allowing the body to move.

The IAR is important for maintaining postural stability and locomotion. It is responsible for the coordination of muscle activity, allowing for smooth and efficient movements. The IAR is also important in the control of muscle spindles, which are sensory receptors that detect the length of a muscle. This is important for maintaining muscle tone and providing the necessary feedback for the coordination of movement.

The IAR is also important for balance. It is responsible for coordinating the body’s response to external forces, such as gravity, and allowing the body to maintain its balance. The IAR is also important in the coordination of eye movement, which is important for maintaining balance and avoiding obstacles.

In addition, the IAR has been suggested to play an important role in motor learning. It is thought that this reflex circuit is involved in the formation of motor memories, which allow us to remember how to perform a task, even after long periods of time.

Overall, the IAR is an important component of postural control and locomotion. It allows for the coordination of muscle activity, and is involved in the control of balance and eye movement. The IAR is also important for motor learning, and has been suggested to be involved in the formation of motor memories.

References

Borhani, J., & Lin, C. H. (2020). Role of the intersegmental arc reflex in motor learning and coordination. Frontiers in Neuroscience, 14, 807. https://doi.org/10.3389/fnins.2020.00807

Kaufman, M. P., & Rymer, W. Z. (2013). Neuromodulation of intersegmental reflexes: Role in motor control and rehabilitation. Physical Medicine and Rehabilitation Clinics of North America, 24(2), 223–236. https://doi.org/10.1016/j.pmr.2013.01.002

Liu, J., & Kuznetsov, A. A. (2013). Intersegmental arc reflex: a review. Frontiers in Neuroengineering, 6(1), 1–13. https://doi.org/10.3389/fneng.2013.00001

Shumway-Cook, A., & Woollacott, M. H. (2016). Motor control: Translating research into clinical practice. Philadelphia, PA: Lippincott Williams & Wilkins.

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