Cervical Spine - Anterior Approach

Modern Study Review (AI-Generated)

High-Yield Summary

The anterior cervical spine approach is the gold standard for direct access to cervical vertebral bodies and discs, facilitating decompression, fusion, and tumor resection. It offers excellent visualization with minimal disruption of posterior musculature and neurovascular structures. This approach remains foundational in cervical spine surgery, though minimally invasive and endoscopic techniques are increasingly used for select cases.

Applied Anatomy & Intervals

Internervous Interval

No true superficial internervous plane.
Between the Spinal Accessory Nerve (innervating SCM) and the ansa cervicalis (innervating strap muscles).
Between the longus colli muscles medially and the carotid sheath laterally (segmental branches from C2-C7).

Anatomic Landmarks

Hard palate = Arch of atlas (C1)
Lower border of mandible = C2-3 level
Hyoid bone = C3
Thyroid cartilage = C4-5
Cricoid cartilage = C6
Carotid tubercle (Chassaignac’s tubercle) = C6

Patient Positioning & Setup

Table Type: Standard radiolucent operating table with fluoroscopy capability.
Patient Position: Supine with a sandbag or rolled towel between scapulae to slightly extend the neck. Head turned away from the incision side. Head of bed elevated ~30° to reduce venous congestion.
Specialized Equipment:
Fluoroscopy (C-arm) positioned for lateral cervical imaging.
Head fixation optional; simple headrest usually sufficient.
Retractors designed for soft tissue and carotid sheath protection.

Surgical Technique (The “Vital Steps”)

Incision & Superficial Dissection

Transverse skin incision at the pathology level, extending obliquely from midline to anterior border of SCM.
Incise platysma in line with skin incision; bluntly split platysma fibers longitudinally.
Identify and incise fascia anterior to SCM; retract SCM laterally.

Deep Dissection & Exposure

Retract strap muscles (sternohyoid and sternothyroid) medially along with trachea and esophagus.
Identify and protect carotid sheath laterally.
Develop plane between medial edge of carotid sheath and midline structures by incising pretracheal fascia medially.
Ligate or cauterize superior and inferior thyroid arteries if exposure above C3-4 is limited.
Bluntly dissect medially to expose longus colli muscles.
Split longus colli longitudinally over midline of vertebral bodies; retract laterally to expose anterior cervical spine.
Confirm operative level with intraoperative fluoroscopy or radiopaque marker.

The “Danger Zone”

Structure	Location & Risk	Protection Strategy
Recurrent Laryngeal Nerve	Deep dissection near tracheoesophageal groove	Gentle medial retraction; avoid deep lateral dissection
Sympathetic Chain & Stellate Ganglion	Lateral to longus colli, near transverse processes	Stay close to midline; avoid aggressive lateral dissection
Carotid Sheath (Carotid artery, Jugular vein, Vagus nerve)	Lateral border of exposure	Retract laterally with SCM; avoid excessive traction
Vertebral Artery	In transverse foramina of cervical transverse processes	Limit lateral dissection beyond longus colli; know anatomy

Post-Operative Pearl

Early mobilization is encouraged. Cervical collar use depends on fusion stability and surgeon preference. Avoid hyperextension or rotation for 4-6 weeks to protect the surgical site and graft integrity.

Classic Clinical Notes