Supraclavicular Nerve, Lateral View

Description

Emerging from the cervical plexus at the nerve point of the neck (punctum nervosum) along the posterior border of the sternocleidomastoid, the supraclavicular nerve group is traced in lateral profile as it courses inferolaterally across the posterior triangle. Fine cutaneous branches fan anterior to the trapezius and descend superficial to the prevertebral fascia, crossing the inferior neck toward the clavicle and the acromial region. The relationship to the external jugular vein as it traverses superficial to sternocleidomastoid is apparent, as are the adjacent fascial planes overlying the scalene muscles. Orientation is clear. Superior and posterior landmarks anchor the branching pattern. Clinically, this lateral view is the one you want for planning a superficial cervical plexus block and for teaching why injections placed just deep to the investing fascia at the midpoint of the sternocleidomastoid anesthetize the supraclavicular distribution over the clavicle, shoulder, and upper pectoral region. It also supports discussions of iatrogenic sensory loss and neuroma after clavicular fracture fixation, neck dissection, or central line placement where traction or transection of these superficial branches can produce persistent dysesthesia over the deltoid and anterior chest wall. The posterior triangle matters because this is where the nerves are exposed and vulnerable. Anatomy faculty can drop this into head and neck blocks (gross anatomy, regional anesthesia, and surgical anatomy) to reinforce the surface landmark of Erb’s point and to differentiate supraclavicular cutaneous innervation from the suprascapular nerve and brachial plexus trunks deep to the scalene interval. Medical publishers will find it suited to chapters on cervical plexus, posterior triangle dissections, and complications of clavicle and neck procedures. Anatomical accuracy verified by SciePro's Medical Advisory Board.