Musculus longus colli
The longus colli is the deepest ventral neck muscle, lying directly on the cervical vertebrae. It originates from the bodies and transverse processes of the first several thoracic vertebrae and inserts on the ventral surfaces of the cervical vertebral bodies and the ventral tubercle of the atlas. The longus capitis is more cranial, originating from the transverse processes of C3–C6 and inserting on the basisphenoid of the skull. Together they flex the cervical spine, stabilize the neck, and facilitate the telescoping gesture during proper engagement. They are innervated by the ventral branches of the cervical spinal nerves.
Origin: Bodies and transverse processes of the first 6 thoracic vertebrae
Insertion: Ventral surfaces of cervical vertebral bodies C2-C6 and the ventral tubercle of the atlas
Action: Flexes the cervical spine; stabilizes the neck; facilitates the telescoping gesture
Innervation: Ventral branches of cervical spinal nerves (C2-C7)
Rarely a primary clinical problem. Dysfunction can occur with neck trauma or as part of broader cervical issues. Relevant in evaluations of neck flexibility and collection.
## Overview Deep cervical instability refers to reduced segmental stability in the neck, often linked to weakness or atrophy of the longus colli and multifidus muscles. It can contribute to poor post
## Overview Cervical arthritis pain referral describes forelimb lameness or gait abnormality that originates from osteoarthritis of the cervical facet joints rather than from the limb itself. Nerve-r
Persistent neck stiffness or reluctance to flex at the poll should be evaluated. These deep muscles are part of the overall neck stabilization system.
## Overview Deep cervical instability refers to reduced segmental stability in the neck, often linked to weakness or atrophy of the longus colli and multifidus muscles. It can contribute to poor posture, inconsistent head carriage, and, in more severe cases, may be associated with dynamic components of cervical vertebral stenotic myelopathy. ## Causes Muscle weakness, joint pathology, or developmental factors affecting vertebral stability. ## Diagnosis Clinical palpation of instability or abnormal motion, neurologic examination, and imaging (radiographs, myelography, or computed tomography) when myelopathy is suspected. ## Treatment Rehabilitation to strengthen deep stabilizers, plus medical or surgical management if significant stenosis or ataxia is present. ## Recovery and Prognosis Variable. Mild instability may improve with therapy; cases with neurologic deficits have a more guarded outlook. ## Prevention Early attention to neck strength and posture in young horses. Signs include: inconsistent head carriage; palpable instability; difficulty maintaining poll flexion; possible ataxia if myelopathy is present
## Overview Cervical arthritis pain referral describes forelimb lameness or gait abnormality that originates from osteoarthritis of the cervical facet joints rather than from the limb itself. Nerve-root irritation or referred pain pathways produce signs that can mimic shoulder, elbow, or foot pain. The lameness is typically not abolished by distal limb nerve blocks. ## Causes Facet joint osteoarthritis with osteophyte formation and synovial inflammation irritates adjacent nerve roots or generates referred pain. Caudal cervical joints are most often implicated. ## Diagnosis Failure of sequential distal limb blocks to abolish the lameness, combined with neck stiffness or positive response to cervical facet analgesia, supports the diagnosis. Imaging confirms arthropathy. ## Treatment Ultrasound-guided facet injections, systemic anti-inflammatories, and physiotherapy address the primary neck pathology. Treating only the limb is ineffective. ## Recovery and Prognosis Many horses improve once the cervical joints are treated. Recurrence is possible as the arthritis progresses. ## Prevention Same as for cervical facet osteoarthritis; early recognition of neck-related lameness prevents unnecessary limb treatments. Signs include: forelimb lameness not improved by distal nerve blocks; neck stiffness; positive response to cervical facet injection; variable muscle atrophy
Rarely a primary clinical problem. Dysfunction can occur with neck trauma or as part of broader cervical issues. Relevant in evaluations of neck flexibility and collection.
Persistent neck stiffness or reluctance to flex at the poll should be evaluated. These deep muscles are part of the overall neck stabilization system.
See the Longus Colli on our interactive 3D horse model. Open 3D Model