Anatomy Notes

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Western University
Anatomy and Cell Biology
Anatomy and Cell Biology 3319
Peter Merrifield

Anatomy NotesJan 3112 The lumbar plexus The lumbar plexus arises from the first 4 lumbar spinal nerveL1L4 It is located within the psoas major muscle Some of its minor branches innervate the abdominal wall but its main branches descend to innervate the anterior thigh via the femoral and obturator nerves The nerves from the lumbar plexus innervate the muscles in the anterior and medial compartments of the thigh and supply cutaneous innervation to anterior and medial portions of the thigh and leg The obturator nerve passes through the obturator foramen of the pelvis and it comes off the anterior division of the plexus It innervates muscles of the medial thigh The femoral nerve runs deep to the inguinal ligament to enter the thigh and it comes off the posterior division of the plexus It innervates muscles of the anterior thigh The sacral plexus The sacral plexus originates from spinal nerves L4S4 and is found directly behind the lumbar plexus About half of the branches of the sacral plexus serve the buttocks superiorinferior gluteal nerves and lower limb but the most important branch for the lower limb is the sciatic nerve which divides into the tibial nerve anterior division and common fibularperoneal nerves posterior division The nerves from the sacral plexus innervate the muscles in the posterior compartment of the thigh and all of the muscles in the leg and supply cutaneous innervation to the lateral and posterior portions of the leg and to the foot Lumbar plexus Femoral nerveanterior compartment of thigh muscles Obturator nervemedial compartment of thigh muscles Sacral plexus Gluteal nerveinferior gluteal nerve gluteus maximus superior gluteal nerve gluteus medius and minimus Sciatic nervetibial nerve posterior compartment of leg intrinsic foot muscles common peroneal nerve superficial branchlateral compartment of leg deep branchanterior compartment of leg Leg muscles The anterior compartment
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