This article is about Lumbar and lumbar plexus: formation, topography, networks and innervation fields. The lumbar plexus is one of two nerve plexuses that supply the lower limbs. The psoas major muscle is formed on the back wall of the abdomen. Branches of the plexus go through the medial and lateral borders, as well as through its ventral surface. It is a complex plexus that gives branches to complete the formation of the lumbo-sacral plexus. The branches mainly supply the femoral, anterior and medial sections of the thigh. They also provide hip and knee joints. The innervation of the skin by the branches of the lumbar plexus is limited to the anterior, lateral and medial parts of the thigh, the medial side of the foot and leg, as well as the lower part of the anterior abdominal wall and the perineum. Regional anesthesia is a highly skilled and accurate method that is widely used to reduce the consumption of drugs in patients and to reduce intraoperative and postoperative complications. A lumbar plexus block can be used in operations involving the hip joint and hip and anterior thigh. Proper knowledge of the anatomy of the lumbar plexus is required to perform the procedure successfully.
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