Abstract
The lumbar plexus (LP) (Fig. 6.1a) participates in innervation of the abdominal wall, the external genitalia and the lower limb (Fig. 6.1b). It consists at origin of the union of the ventral branches of the spinal nerves L1, L2, L3 and L4 (a branch of the ventral branch of T12 frequently joins it with L1). It is located between the two heads of the psoas major muscle laterally in relation to the lumbar vertebral column, in a cleaved, aponeurotic space, demarcated dorsally by muscle fibres which insert on the transverse process (TP) and ventrally by fibres which insert on the lateral aspects of the vertebral bodies and on the corresponding discs. In this space, the ascending lumbar vein also passes. Anastomoses and interconnections of these different branches eventually form the terminal branches of the lumbar plexus (Fig. 6.2) which are the iliohypogastric (L1), ilioinguinal (L1), genitofemoral (L1-L2), lateral cutaneous of the thigh (L2-L3), femoral (L2-L3-L4) and obturator nerves (L2-L3-L4) as follows [1]:
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05 November 2023
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Eisenberg, E., Gaertner, E., Clavert, P. (2023). Lumbar Plexus Blocks. In: Eisenberg, E., Gaertner, E. (eds) Ultrasound in Peripheral, Neuraxial and Perineuraxial Regional Anaesthesia. Springer, Cham. https://doi.org/10.1007/978-3-031-08804-9_6
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