Anatomy of Lumbar Plexus and Implications to Regional Anaesthesiologist

Lumbar plexus is one of the two nerve plexuses which supply the lower limb. It is formed in the posterior abdominal wall within the psoas major muscle. The branches of the plexus exit via the medial and lateral borders as well as its ventral surface. It is a complex plexus which gives a branch to complete the formation of lumbo sacral plexus. The branches mainly supply the groin, anterior and medial compartments of thigh. They also supply the hip and knee joints. The cutaneous innervation by the branches of lumbar plexus is limited to the anterior, lateral and medial parts of the thigh, medial side of the leg and foot and also the lower part of anterior abdominal wall and perineum. Regional anaesthesia is a highly skilled and precise technique used widely in the patients to reduce the drug usage and decrease the intra and post operative complications. Lumbar plexus block can be used in surgeries related to hip joint and anterior part of thigh and groin. To execute the procedure successfully, sound knowledge in anatomy of lumbar plexus is required. Keywords: Lumbar plexus, Branches, Regional anaesthesia.