## Overview The brachiocephalicus is the large muscle that runs from the poll and cranial neck to the humerus and is a major protractor of the forelimb. Strain or chronic hypertonicity of this muscle produces neck stiffness, resistance to lateral flexion, shortened forelimb stride, and sometimes a mild head-bobbing lameness. Compensatory overuse is common when other forelimb or thoracic-sling problems exist. ## Causes Trauma from falls or being cast, swimming (which strongly stretches the muscle), repetitive protraction under fatigue, and compensatory overload from lower-limb pain are typical triggers. Psychological tension can also maintain chronic tightness. ## Diagnosis Palpation reveals pain, heat, or hypertonicity along the muscle, especially near its humeral insertion. Observation under saddle shows reluctance to stretch the neck forward or bend laterally. Ultrasound can confirm acute fiber tearing when present. ## Treatment Rest from aggravating work, anti-inflammatory medication, manual therapy, and gradual stretching and strengthening restore function. Addressing any primary forelimb lameness is essential to prevent recurrence. ## Recovery and Prognosis Most strains heal well with appropriate rest and rehabilitation. Chronic hypertonicity may require ongoing management of saddle fit, dentistry, and training. ## Prevention Balanced training, proper warm-up, and prompt treatment of forelimb pain reduce compensatory strain on the brachiocephalicus.
neck stiffness or resistance to bending; pain on palpation of the lower neck or shoulder; shortened forelimb protraction; mild head bob
## Overview The brachiocephalicus is the large muscle that runs from the poll and cranial neck to the humerus and is a major protractor of the forelimb. Strain or chronic hypertonicity of this muscle produces neck stiffness, resistance to lateral flexion, shortened forelimb stride, and sometimes a mild head-bobbing lameness. Compensatory overuse is common when other forelimb or thoracic-sling problems exist. ## Causes Trauma from falls or being cast, swimming (which strongly stretches the muscle), repetitive protraction under fatigue, and compensatory overload from lower-limb pain are typical triggers. Psychological tension can also maintain chronic tightness. ## Diagnosis Palpation reveals pain, heat, or hypertonicity along the muscle, especially near its humeral insertion. Observation under saddle shows reluctance to stretch the neck forward or bend laterally. Ultrasound can confirm acute fiber tearing when present. ## Treatment Rest from aggravating work, anti-inflammatory medication, manual therapy, and gradual stretching and strengthening restore function. Addressing any primary forelimb lameness is essential to prevent recurrence. ## Recovery and Prognosis Most strains heal well with appropriate rest and rehabilitation. Chronic hypertonicity may require ongoing management of saddle fit, dentistry, and training. ## Prevention Balanced training, proper warm-up, and prompt treatment of forelimb pain reduce compensatory strain on the brachiocephalicus.
neck stiffness or resistance to bending; pain on palpation of the lower neck or shoulder; shortened forelimb protraction; mild head bob