Musculus longissimus cervicis
The cervical continuation of the longissimus dorsi (the longest muscle in the horse). Extends from the thoracic region into the neck, providing power for neck extension and lateral flexion.
Origin: Transverse processes of the first several thoracic vertebrae
Insertion: Articular and transverse processes of cervical vertebrae C3-C7
Action: Extends and laterally flexes the cervical spine
Innervation: Dorsal branches of cervical spinal nerves
The transition zone where the neck meets the withers (C6-T2) is a common site of pain and stiffness, especially in dressage horses and jumpers.
The transition zone where the neck meets the withers (C6-T2) is a common site of pain and stiffness, especially in dressage horses and jumpers. Signs include: Pain on palpation at the base of the neck/top of withers; stiffness transitioning from trot to canter; resistance to lateral bending at this junction; reduced forelimb stride length.
See the Longissimus Cervicis (Neck) on our interactive 3D horse model. Open 3D Model