- long thoracic nerve is derived from ventral rami of C5, C6, & C7 - close to their emergence from intervertebral foramina;
- it runs downward & pases either in front of or behind middle scalene muscle;
- it reaches upper slip of serratius anterior muscle & descends on outer surface of this muscle, giving branches into it;
- Winging of Scapula:
- most often associated with Parsonage-Turner syndrome, a condition thought to be due to an inflammatory or immune-mediated mechanism;
- may occur from long thoracic nerve injury (most common) or from spinal accessory nerve injury (which deinnervates the trapezius) or a dorsal scapular nerve injury
Long Thoracic Nerve: Anatomy and Functional Assessment.