Long Thoracic Nerve, Lateral View

Description

Originating from the ventral rami of C5 to C7, the long thoracic nerve descends along the lateral cervical region and continues inferiorly on the superficial aspect of the thoracic wall, tracking close to the midaxillary line as it approaches the serratus anterior. Posteriorly, the thoracic vertebrae and their intervertebral discs define the paravertebral boundary, while the ribs sweep anterolaterally from their costovertebral articulations and frame the intercostal spaces. Segmental intercostal nerves course within these spaces, inferior to each rib along the costal groove, contrasting with the longer, more vertically oriented trajectory of the long thoracic nerve across the rib cage. Spatial relationships read cleanly in lateral profile. Lateral exposure is clinically pragmatic because the long thoracic nerve is vulnerable where it runs on the chest wall without substantial muscular cover. Injury from axillary dissection, mastectomy with lymph node sampling, chest tube placement placed too anteriorly, or traction during overhead athletics can denervate serratus anterior and produce medial scapular winging with impaired upward rotation. This is the nerve you think of when the scapula lifts off the thorax during a wall-push test. The adjacent intercostal nerves also matter, since postoperative thoracotomy pain syndromes and intercostal neuralgia map segmentally and can be confused with longer-tract neuropathic patterns. In teaching, this plate fits well in gross anatomy labs, peripheral nervous system modules, and surgical anatomy primers that cover the brachial plexus branches beyond the neck and axilla. Editorially, it supports figures on scapular winging, axillary surgery risk anatomy, and safe corridors for pleural procedures by clarifying where long thoracic and intercostal nerves travel relative to ribs and vertebral landmarks. Anatomical accuracy verified by SciePro's Medical Advisory Board.