The trapezius muscle in horses: important function, significance and common problems

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The trapezius muscle, better known as the trapezius muscle, is a key muscle for shoulder girdle mobility and plays an important role in the stabilization and movement of the foreleg. It belongs to the group of limb support muscles because it is closely linked to shoulder mobility and the suspension of the foreleg. Despite its essential function, the trapezius muscle is often overlooked when it comes to the health and mobility of the horse.

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Anatomy of the trapezius muscle in horses

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The trapezius muscle extends over a wide area of ​​the horse's body and is divided into two main parts:

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1. Pars cervicalis (front part): This part of the trapezius muscle runs from the 2nd cervical vertebra to the shoulder blade and is particularly responsible for the movements of the neck region and the presentation of the front legs.
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2. Pars thoracica (posterior part): This part runs from the 2nd to the 10th thoracic vertebrae to the shoulder blade and ensures that the shoulder blade is moved backwards, which is important for supporting the shoulder during movement and the abduction of the forelegs.
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The trapezius muscle in horses is responsible for various movements, in particular:

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• The presentation and abduction of the front legs, i.e. the lifting and lateral spreading of the front legs.
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• The forward and backward movement of the shoulder blade, which is crucial for the smooth and flowing movement of the horse during canter and trot.
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• Supports neck movement by fixing the shoulder blade and allowing elastic suspension of the shoulder.
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The trapezius muscle and its role in shoulder stabilization

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Since horses, unlike humans, do not have a collarbone, the horse's shoulder is stabilized solely by muscles, tendons, and ligaments. The trapezius muscle plays a crucial role here, externally securing the shoulder blade and thus ensuring the horse's free mobility and power transmission from the forequarters to the torso.

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In optimal condition and with good equipment, the trapezius muscle is no wider than one or two fingers in cross-section. Nevertheless, its function should not be underestimated, as it is responsible for the coordination of the forelegs and the mobility of the entire upper body.

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Problems in the trapezius muscle: causes and symptoms

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A poorly functioning or tight trapezius muscle can lead to several movement problems in horses. One of the most common causes of problems in the trapezius muscle is improperly fitting equipment, such as an ill-fitting saddle. This can lead to muscle overload and tension, significantly impairing the horse's mobility.

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Symptoms that indicate problems in the trapezius muscle may include the following:

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1. Difficulty with lateral movement: Since the trapezius muscle is also responsible for the mobility of the shoulder, a blockage or tension can lead to difficulties with lateral movements such as shoulder-in or traverses.
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2. Limited mobility of the foreleg: The horse may have difficulty fully leading or lifting the foreleg, which can be particularly problematic when working with fences or jumping.
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3. Tension and muscle wasting: If the trapezius muscle is tense for an extended period, this can lead to visible dimpling or muscle wasting in the trapezius area. These changes are often an indication that the muscle is overworked or that the horse has suffered from inappropriate equipment or loading in the past.
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4. More difficult movement coordination: A tight shoulder blade and limited mobility of the trapezius muscle can lead to a general lack of coordination in the horse, causing it to walk unevenly or have difficulty cantering.
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How to relieve tension and fascial adhesions in your horse's trapezius muscle

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With the NeedleyRoll fascia and massage roller for horses, the entire trapezius muscle can be worked evenly on both sides. Start with little to no pressure and work your way up carefully. Pay close attention to your horse's reactions to find out what works for him. Stay mindful and try different pressure levels and movements to gently release tension and adhesions and relax the muscle.

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