Superficial Cervical Plexus Block: Defined by a Fascial Plane

The superficial cervical plexus block is one of the simplest blocks in practice — a single subcutaneous injection along the posterior border of sternocleidomastoid — and one of the best supported for the specific operations it covers. It anaesthetises the skin of the anterolateral neck, the angle of the jaw, the ear and the upper chest wall.

Its value is that it achieves this without touching the deep cervical structures, which is precisely what the deep block does touch. This reference sets out the anatomy, the evidence in the procedures where it is used, and why the superficial approach is usually the right one. It sits under our clinical reference to nerve blocks in outpatient pain practice.

Four nerves at one point

The superficial cervical plexus arises from the C2 to C4 ventral rami and emerges at the posterior border of sternocleidomastoid, roughly at its midpoint, where four terminal branches become subcutaneous together:

• Lesser occipital — the skin behind the ear.
• Great auricular — the angle of the jaw, the parotid region and much of the ear.
• Transverse cervical — the anterior neck.
• Supraclavicular — the lower neck and the upper chest wall to about the second rib.

Because all four converge at that point, a single subcutaneous deposit covers a wide territory. The injection is deliberately kept superficial to the prevertebral fascia. That plane is the whole distinction between this block and the deep cervical plexus block, which carries risks — phrenic nerve palsy, vertebral artery injection, epidural spread — that the superficial block does not.

Thyroid and parathyroid surgery

This is the best-evidenced indication. A 2025 systematic review and meta-analysis examined bilateral superficial cervical plexus block for postoperative pain in thyroid and parathyroid surgery, and a 2024 systematic review reached the same conclusion for post-thyroidectomy pain: the bilateral block relieves pain after these operations.

Bilateral blockade is acceptable here precisely because the block is superficial. The same could not be said of bilateral deep cervical plexus blocks, where bilateral phrenic involvement would be a genuine hazard. That asymmetry is the practical argument for the superficial approach in midline neck surgery.

Ear, mandible and clavicle

Three further uses appear in the recent literature at varying evidential strength.

A 2026 systematic review with GRADE assessment examined regional nerve blocks for middle ear surgery, an area where the great auricular and lesser occipital contributions matter. A 2026 systematic review assessed the superficial cervical plexus block as an alternative to general anaesthesia for mandibular and perimandibular procedures — a meaningful option in patients for whom general anaesthesia is a risk rather than a convenience. And the clavicle, straddling the supraclavicular nerves and the brachial plexus, is the region where this block is most often combined with another, a question a 2026 meta-analysis of clavipectoral fascial plane block addresses directly.

Clavicular analgesia is the useful illustration: the skin over the clavicle is supplied by the supraclavicular branches of the cervical plexus while the bone is supplied elsewhere, so a block that covers one and not the other produces a partial and confusing result. Knowing which structure hurts determines which block is needed.

Safety

The superficial block is among the safest in regional practice, and its safety is a direct consequence of staying in the subcutaneous plane. The failure mode that matters is injecting too deep, through the prevertebral fascia, which converts it into a deep cervical plexus block with that block’s risks.

The external jugular vein crosses the field and is the vessel most likely to be encountered. Total dose still matters, particularly when the block is bilateral and combined with other techniques; local anaesthetic systemic toxicity is covered in the nerve blocks reference.

Patients should be warned to expect numbness of the ear and the angle of the jaw, which is disconcerting if unannounced.

For clinicians

This block can be performed by landmark, and ultrasound is used mainly to confirm the plane and identify the vessels rather than to find the nerves. That makes it a good early block to learn and a poor one to assume mastery of, because the consequences of the needle going a few millimetres too deep are entirely different from the block intended.

This reference carries no needle depths or volumes. Empire teaches the superficial cervical plexus block within Advanced Musculoskeletal Ultrasound Guided Injections, alongside the other head, neck and sympathetic blocks in the pain management academy.