El iliocostal es un músculo profundo de la espalda. Se localiza lateralmente dentro del complejo muscular erector de la columna y se puede dividir en tres partes: lumbar, torácica y cervical. Inserciones: se origina en las vértebras torácicas inferiores y lumbares, el sacro, la cara posterior de la cresta ilíaca y los ligamentos sacroilíacos y supraespinosos. Se inserta en el ángulo costal de las costillas y en las apófisis transversas cervicales. Acción: actúa unilateralmente para flexionar lateralmente la columna vertebral. Actúa bilateralmente para extender la columna vertebral y la cabeza. Inervación: ramos posteriores de los nervios raquídeos. Irrigación sanguínea: El músculo iliocostal cervical está irrigado por las arterias occipital, cervical profunda y vertebral. El músculo iliocostal torácico está irrigado por las ramas dorsales de las arterias intercostales posteriores y subcostales. El músculo iliocostal lumbar está irrigado por ramas dorsales de las arterias lumbares y sacras. By TeachMeSeries Ltd (2026) Fig. 1: erector de la columna. Pro Feature - 3D Model 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 Frequent questions What is the iliocostal muscle? The iliocostal muscle is a deep muscle of the back that is part of the erector spinae group. It is divided into three sections: lumbar, thoracic, and cervical. Where does the iliocostal muscle originate and insert? The iliocostal muscle originates from the lower thoracic and lumbar vertebrae, the sacrum, the posterior aspect of the iliac crest, and certain ligaments. It inserts at the costal angles of the ribs and the cervical transverse processes. What actions does the iliocostal muscle perform? The iliocostal muscle laterally flexes the vertebral column when acting unilaterally and extends both the spine and the head when acting bilaterally. What is the innervation of the iliocostal muscle? The iliocostal muscle is innervated by the posterior rami of the spinal nerves. This innervation is essential for its motor function and coordination. How is the iliocostal muscle supplied with blood? The cervical part of the iliocostal muscle receives blood from the occipital, deep cervical, and vertebral arteries. The thoracic section is supplied by branches of the posterior intercostal and subcostal arteries, while the lumbar part is vascularised by branches from the lumbar and sacral arteries. Rate This Article