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BMS 301 (47)

Nerve plexus, lumbosacral plexus, nerves of lower limb, collateral circulation, veins of limbs

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Biomedical Science
BMS 301
Mark Frasier

29 August Nerve plexus Ventral rami of spinal nn Network – join together to innervate skin and muscle of body wall and limbs with sensory, motor, and autonomic nn Cervical – neck/brachial – upper limb/lumbar/sacral Lumbosacral plexus Ventral rami of spinal nn L1- S4(9 spinal nn together) Supplies motor, sensory, and autonomic nerves to Inferior/lateral/anterior abdominal wall Pelvic viscera – S – S 2 4 Perineum Gluteal region Entire lower limb System is somewhat redundant Paresis – weakening of movement Lumbar plexus – L – 1 4 Sacral plexus – L -4S 4 Femoral nerve Anterior thigh Hip flexors Knee extensors Obturator nerve Medial thigh Hip adductors Sciatic nerve Posterior thigh & leg Hip extensors Knee flexors Split from sciatic Common fibular n Doris flexors of ankle Tibial n Plantar flexors of ankle Tibial n & branches Posterior leg & sole of foot Medial & lateral plantar nn Sole of foot Common fibular n & branches Lateral & anterior leg & dorsum of foot Superficial fibular n Deep fibular n Heart → aorta → abdominal aorta → common iliac artery on right and left → each split into external and internal iliac arteries Internal iliac arteries take care of pelvic viscera and gluteal region External iliac arteries take care of lower limb Becomes femoral artery Collateral circulation Arteries come off main artery and join together If main artery is obstructed, collateral arteries compensate Cannot
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