The Formation Of Lateral Cord Of Brachial Plexus And Its Branches – A Cadaveric Study

ABSTRACT

Introduction: The lateral cord of brachial plexus is formed from the anterior divisions of upper and middletrunks, formed from roots C5, C6 and C7. Variations in the formation and branching of lateral cord are notuncommon. Considering its variations, a detailed knowledge is necessary to neurosurgeons, anaesthetists andorthopedicians to avoid complications.Materials and Methods: The present study was conducted in the Department of Anatomy, Mamata MedicalCollege, Khammam. 70 formalin fixed upper limbs [35 cadavers] were dissected for a period of 5 years. Formationand branching of lateral cord of brachial plexus were observed and variations are taken into consideration.Observations Out of 70 limbs dissected, we observed communication between the lateral cord and medial rootof median nerve in 10 limbs. In 2 limbs musculo-cutaneous nerve was not formed. In 3 limbs musculo-cutaneousnerve did not pierce the coracobrachialis. In 7 limbs low union of medial and lateral roots of median nerve wasobserved. In 2 limbs, lateral pectoral nerve arises from upper trunkConclusion: The lateral cord and its branches show variations more frequently than medial and posterior cordsof brachial plexus