The vertical part is the central and largest component of longus colli, providing pure cervical flexion. Its attachment to multiple vertebral bodies gives it a long lever arm for cervical flexion force.
| Origin | Bodies of C5-T3 vertebrae |
|---|---|
| Insertion | Bodies of C2-C4 vertebrae above |
| Nerve Supply | Ventral rami of C2-C6 |
| Blood Supply | Vertebral artery muscular branches; Ascending cervical artery |
| Actions | Flexes the cervical spine — primary flexion role of longus colli; Stabilises the cervical spine against extension forces |
|---|
The vertical part is identified in the anterior cervical approach as it lies on the vertebral bodies lateral to the midline. The sympathetic chain lies lateral to longus colli and must be preserved to avoid Horner syndrome.
Not palpable externally.
The vertical fibres serve as the medial reference in anterior cervical discectomy, with their midline raphe being the correct surgical plane to avoid the carotid sheath laterally.
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