The deep cervical flexors (longus capitis and longus colli) are the principal anterior stabilisers of the cervical spine, lying directly on the anterior vertebral bodies and discs. Unlike the superficial flexors (SCM, scalenes) which are global mobilisers, the DCF group provides segmental stabilisation essential for cervical posture and injury prevention. DCF weakness is the central finding in chronic neck pain, whiplash, and cervicogenic headache rehabilitation.
| Origin | Longus colli: anterior vertebral bodies and transverse processes of C1-T3; Longus capitis: transverse processes of C3-C6 |
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| Insertion | Longus colli: anterior atlas arch and C2-C4 bodies; Longus capitis: basilar occipital bone (anterior cranial base) |
| Nerve Supply | Ventral rami of C1-C6 (longus colli C2-C6; longus capitis C1-C3) |
| Blood Supply | Ascending cervical artery and vertebral artery branches |
| Actions | Longus colli: cervical spine flexion, stabilisation of the cervical spine by co-contraction with extensors; Longus capitis: head flexion on the neck; together they form the deep cervical flexor (DCF) group providing segmental cervical stability |
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Deep cervical flexor training is the cornerstone of cervical spine physiotherapy. The craniocervical flexion test (CCFT) using a pressure biofeedback unit assesses DCF activation independently of superficial flexors. Chronic neck pain and whiplash consistently demonstrate DCF inhibition and atrophy on MRI. Progressive DCF training (chin tuck exercises targeting longus colli activation) reduces pain and disability in cervical radiculopathy and chronic neck pain. Anterior cervical discectomy and fusion (ACDF) requires retraction of the longus colli to expose the anterior cervical spine.
Whiplash injury produces reflex inhibition of the deep cervical flexors (longus colli and longus capitis) with compensatory over-recruitment of the superficial neck flexors, demonstrated by reduced craniocervical flexion test scores; specific DCF rehabilitation restores segmental cervical stability and reduces chronic whiplash pain and headache.
