Nerves Intercostal-brachial

Intercostal-brachial nerves (lat. n. intercostobrachiales) - branches of the second - sixth intercostal nerves, innervating the muscles and skin of the inner surface of the shoulder.

The intercostal-brachial nerves arise from the corresponding intercostal nerves, pass through the intercostal spaces to the axilla and are divided into anterior (Latin rana anterior) and posterior (Latin rana posterior) branches.

The anterior branches innervate the subcutaneous chest muscle, the pectoralis major muscle, and the anterior portions of the pectoralis minor muscle.

The posterior branches innervate the skin of the inner surface of the shoulder.

The intercostal nerves are the anterior branches of the cervical ganglia and give rise to the intercostal branch (ramus intercostalis) to the intercostal nerves in the intercostal spaces. Within the back, each of these nerves is divided into several trunks corresponding to the vertebrae of the thoracic region. Intercostal nerve VIII begins the branchial branch of the branchial ganglion. Each intercostal trunk ends in a cardiac plexus or node. From here the sensory branches go outward between the ribs and to the organs lying deeper in the lateral chest wall; The intercostal branch joins the spinal nerves of the thoracic and lumbar regions posteriorly.