Among the joints of the foreleg the horse has the greatest freedom of movement the shoulder joint (artic. scapulo-humeralis), but due to extremely pronounced specialization foreleg the horse and this joint, characterized by known limitations of movements:
Already acquaintance with articular surfaces scapula and humeral head horse is sufficient to establish, first, a slight predominance of the area of the articular surface of the head itself - scapula (caput humeri - cavitas tfleoioidalis) and, secondly, the predominance of the anterior-posterior sounding these surfaces over the other (the predominance of the transverse axis of movement, allowing greater excursions in the direction of flexion and extension).

All the same, and in the shoulder joint horses approaching the spherical joint, there may be traffic around three mutually perpendicular axes: the dominant transverse (flexio, extensio) and allow only limited motion: vertical (rgonatio, supinatio) and sagittal (adductio, abductio) axes.
Among the muscles, which are applicable to the shoulder joint is a horse, we should distinguish two groups:
a) muscles, changing the spatial position of the shoulder angle and limb as a whole (the muscles of the foreleg belt) and
b) the muscles that change the relative position of the scapula and shoulder (limb muscles are actually allowing relative displacement of the humerus relative to the shoulder blade)