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El cordon lateral y el nervio mediano se asocian a variaciones. Observamos variaciones simultaneas en la formacion del cordon lateral y nervio mediano en treinta y dos cadaveres fijados en formol. En 29,6% de extremidades superiores el cordon lateral se formo por la division anterior del tronco superior solamente. En el 21,8% de estos casos la division anterior del tronco medio formo dos raices adicionales para el nervio mediano y en 7,8% de los casos la division anterior del tronco medio se unio con la raiz medial del nervio mediano. En el 14% de las extremidades superiores no se formo la parte superior del tronco y el cordon lateral se formo por la union de la division anterior de las raices C5, C6 y C7. En 6.2% de esos casos donde no se formo la parte superior del tronco, el nervio mediano recibio una raiz adicional del cordon lateral. Creemos que el conocimiento previo de estas variaciones anatomicas es de interes para el anatomista y medico por igual. Los cirujanos que realizan procedimientos que implican neoplasias o reparar traumatismos necesitan ser conscientes de estas variaciones. Lateral cord and median nerve are associated with variations. We observed concurrent variations in the formation of lateral cord and median nerve in thirty two formalin fixed cadavers. In 29.6% upper limbs Lateral cord was formed by anterior division of upper trunk only. In 21.8% of these cases the anterior division of middle trunk formed two additional roots for the median nerve and in 7.8% cases anterior division of middle trunk joined with medial root of median nerve. In 14% upper limbs the upper trunk was not formed and the lateral cord was formed by union of anterior division of C5, C6 and C7 roots. In 6.2% of such cases where upper trunk was not formed, the median nerve received an additional root from lateral cord. We believe that prior knowledge of such anatomical variations is of interest to the anatomist and clinician alike. Surgeons who perform procedures involving neoplasms or repairing trauma need to be aware of these variations.

revista argentina de anatomía clínica

CONCURRENT VARIATIONS IN THE FORMATION OF LATERAL CORD AND MEDIAN NERVE OF BRACHIAL PLEXUS. 208 Variaciones en la formación del cordón lateral y el nervio mediano del plexo braquial