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When we talk about head and neck position, it’s easy to reduce the conversation to a shape or frame, but the poll is far more important than aesthetics. It’s a gateway.

The poll is where posture and perception meet. With so many nerves, muscles, and connective tissues passing through this small area, restriction here can change how the horse experiences movement throughout their entire body.

When the poll is restricted or fixed into a position the body can’t yet support, we often see compensations appear elsewhere such as the shoulders, the back, or the hind end. It's not necessarily because those areas are the problem, but because the gateway at the top is no longer allowing information and movement to flow freely.

There is a small but significant structure at the poll that plays an important role in how the horse moves and feels: the myodural bridge.

The myodural bridge is a connective tissue structure that links the suboccipital muscles at the base of the skull to the dura mater (the protective covering of the spinal cord). Through this connection, activity and tension in the suboccipital muscles can directly influence dural tension. In practical terms, forces in the musculoskeletal system have the potential to affect the central nervous system via this interface.

The greater occipital nerve also travels through this region, making it particularly sensitive to mechanical strain or compression.

Functionally, the myodural bridge helps anchor the spinal cord, prevents infolding of the dural tissue during flexion, extension, and rotation of the head and neck, and is believed to support the circulation of cerebrospinal fluid.

This region is especially significant because it is one of the very few places in the body where the spinal cord is not fully protected by bone. Due to its close proximity to the brainstem, sustained tension or irritation here can influence pain perception, sensory processing, and overall nervous system regulation.

Understanding these structures helps explain why Pillar One can have such a meaningful impact on the nervous system. As we've explored here, tension around the poll has the potential to influence tension on the spinal cord, which can interfere with reliable sensory feedback and proprioceptive input. When that feedback becomes inconsistent, the nervous system is more likely to organize around a sympathetic, protective state. By relieving unnecessary tension and restoring a comfortable range of motion at the poll, we support the conditions for clearer communication within the system and a greater sense of regulation and safety.

This area can be affected by prolonged or extreme head and neck positions, rein use, ill-fitting equipment, or traumatic events such as pull-back injuries. Over time, irritation here doesn’t stay local, it can change how the entire body organizes movement.

The myodural bridge sits within a much larger, three-dimensional myofascial network that connects the poll to the rest of the body. That broader network and how tension travels through it is where we’ll go next.