El nervio pectoral medial es un nervio motor que se origina en el cordón medial del plexo braquial. Proporciona inervación motora al músculo pectoral menor y a la cabeza esternocostal del pectoral mayor. Característica Pro - Modelo en 3D You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Trayecto El nervio pectoral medial se origina en el cordón medial del plexo braquial y contiene fibras procedentes de C8 y T1. Surge posteriormente a la primera porción de la arteria axilar, antes de pasar medialmente a la segunda porción de la arteria. Luego discurre anteriormente entre la arteria y la vena axilares, donde comúnmente recibe una rama del nervio pectoral lateral para formar un asa nerviosa (asa pectoral). Desde aquí, penetra en el músculo pectoral menor y le aporta inervación motora. Algunas fibras continúan su recorrido a través del músculo para inervar la porción inferior de la cabeza esternocostal del pectoral mayor. By TeachMeSeries Ltd (2026) Fig. 1: nervios pectoral medial y lateral. Característica Pro - Atlas de disección You've Discovered a Pro Feature Access our Dissection Image Library Enhance your understanding with high-resolution dissection images showcasing real-life anatomy. Learn More Funciones motoras El nervio pectoral medial proporciona inervación motora a los dos siguientes: Pectoral menor. Pectoral mayor (cabeza esternocostal). By TeachMeSeries Ltd (2026) Fig. 2: las cabezas esternal y clavicular del músculo pectoral mayor. By TeachMeSeries Ltd (2026) Fig. 3: los músculos serrato anterior y pectoral menor. Frequent questions What is the medial pectoral nerve? The medial pectoral nerve is a motor nerve that originates from the medial cord of the brachial plexus. It innervates the pectoralis minor muscle and the sternocostal head of the pectoralis major muscle. What muscles are innervated by the medial pectoral nerve? The medial pectoral nerve provides motor innervation to the pectoralis minor and the sternocostal head of the pectoralis major. This innervation is crucial for the movement and function of these chest muscles. Where does the medial pectoral nerve originate? The medial pectoral nerve originates from the medial cord of the brachial plexus, specifically containing fibres from the C8 and T1 spinal nerves. It emerges posterior to the first part of the axillary artery. How does the medial pectoral nerve travel in the body? After its origin, the medial pectoral nerve travels medially to the second part of the axillary artery and runs anteriorly between the axillary artery and vein. It typically receives a branch from the lateral pectoral nerve to form a nervous loop before penetrating the pectoralis minor. What is the clinical significance of the medial pectoral nerve? The medial pectoral nerve is clinically significant due to its role in innervating key muscles in the chest, which are essential for arm movement and stability. Injury to this nerve can lead to weakness in shoulder and arm function. Valora este artículo