Nervous/Cardiovascular system of Lower extremity

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University of Alberta
Physical Education and Sport
Gail Amort- Larson

Nerves of Lower Extremity -Spinal Nerves: 31 pairs of spinal nerves originate from the spinal chord: •all are mixed (m/s) nerves •thousands of fibers per spinal nerve •each pair serves a particular region of the body •each pair also provides some service to the region supplied by the spinal nerve above it and the spinal nerve below it (redundancy) *-Lumbar Plexus: Along side of first four lumbar vertebrae. Anterior rami of spinal nerves L1-L4, some T12 fibers. •Innervate structures of lower abdomen, anterior and medial portions of lower extremity(thigh) •Lumbar trunk made of L3-L5 •Two main nerves: Femoral, obturator -Femoral Nerve: Sensory innervation to anterior and lateral thigh, medial leg and foot. •Motor innervation to anterior muscles of thigh •Includes iliopsoas, sartorius, and quadriceps femoris group -Obturator Nerve: Sensory innervation to medial thigh. Motor innervation to adductor muscles of thigh. Goes through obturator foramen -Sacral Plexus: Immediately inferior to lumbar plexus. Anterior rami of spinal nerves L4, L5, S1-S4 •Innervates lower back, pelvis, perineum, posterior thigh and leg, dorsal and plantar surfaces of foot -Sciatic Nerve(part of sacral plexus): Largest nerve of body. Passes from pelvis through greater sciatic notch to posterior thigh. Composed of tibial and common fibular nerves -Tibial nerve: Forms medial and lateral plantar nerves on sole of foot. sensory innervation to calf of leg, plantar surface of foot. •*Motor innervation to posterior thigh., leg muscles, and intrinsic muscles of foot •Common Fibular Nerve: Branches into deep(anterior) and superficial(posterior) fibular nerves. sensory innervation to anterior and lateral leg and dorsum of foot •wraps around head of fibula •deep to biceps femoris muscle •Motor innervation to anterior and lateral muscles of leg and foot -Posterior
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