Supraclavicular Nerve, Gross Anatomy

Description

Originating from the ventral rami of C3 and C4 at the cervical plexus, the supraclavicular nerves emerge at the posterior border of the sternocleidomastoid and descend inferolaterally toward the clavicle. From this lateral head and neck perspective, their medial, intermediate, and lateral branches course superficial to the clavicle, spreading over the anterosuperior chest wall and toward the acromial region of the shoulder. Nearby landmarks include the mandible and lateral skull, cervical vertebrae, and the shoulder girdle with scapula and clavicle; deeper cervical roots and axons are implied proximally at the spinal level. Sensory territory is the focus. Clinically, this course explains why the supraclavicular nerves are vulnerable during clavicle fixation, central venous access near the base of the neck, and incision placement for shoulder arthroscopy portals and neck dissections. Paresthesia over the clavicle and upper pectoral region after plating or fracture can reflect traction, neuroma formation, or iatrogenic transection of these superficial branches as they cross anterior to the clavicle. For regional anesthesia teaching, the drawing supports the classic “Erb’s point” injection site at the midpoint of the posterior sternocleidomastoid border, where these cutaneous branches become accessible. Use this plate in gross anatomy and neuroanatomy courses when introducing the cervical plexus and mapping cutaneous innervation of the neck and shoulder, or in surgical education material covering clavicular approaches and incision planning to reduce postoperative numbness. It also fits radiology and pain service references discussing sensory distribution patterns and targeted nerve blocks. Anatomical accuracy verified by SciePro's Medical Advisory Board.