ANAT 2647 Lower Extremity Study Guide - Detailed

ANAT 2647 Lower Extremity Study Guide - Detailed -...

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Lumbosacral Plexus
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Lumbar Plexus formed from the ventral rami of nerves L1­L4 and some fibers from T12, forming iliohypogastric nerves ilioinguinal nerve genitofemoral nerve lateral femoral cutaneous nerve femoral nerve saphenous nerve obturator nerve next slide
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Cutaneous Innervation of Lumbar Plexus
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Lateral Femoral Cutaneous Nerve lateral femoral cutaneous nerve­ somatosensory only to skin of lateral aspect of thigh. Femoral nerve •largest branch of lumbar plexus •motor and somatosensroy •skin of anterior and lateral thigh, medial leg and foot •anterior muscles of thigh and extensors of leg; iliacus , psoas major , pectineus , quadriceps femoris (rectus femoris, vastus intermedius, vastus lateralis and vastus medialis), and sartorius
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It is in the femoral triangle where the femoral nerve, over lying the iliacus muscel, that the nerve divides into its muscular and sensory branches. Only the saphenous nerve branch enters the adductor canal , along with a branch to the vastus medialis muscle. adductor longus rectus femoris sartorius iliacus psoas pectineus Femoral Nerve (cont)
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Femoral Nerve Innervates muscles of the Anterior Thigh Action: Flex hip, extend knee adductor canal adductor hiatus Injury to nerve: Weakness of hip flexion, loss of knee extension (no patellar reflex), sensory loss on anteromedial thigh, knee, leg, and foot
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Anterior thigh compartment muscles innervated by the femoral nerve
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Saphenous Nerve formed from the posterior division of the femoral nerve is the largest cutaneous branch of the femoral nerve. innervates skin of medial aspects of leg and foot: knee joint
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Obturator Nerve • sensory innervations­ skin of superior medial thigh • motor innervation­ adductor muscles of leg: external oblique, pectineus, adductor longus, adductor brevis, adductor magnus, and gracilis
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iliohypogastric nerve formed by fibres from L1 , with some contribution from T12. runs obliquely across the quadratus lumborum muscle behind the kidney sensory innervation­ skin of anterior abd wall Motor innervation­ internal and external obliques and transversus abdominis 1. Subcostal nerve 2. Iliohypogastric nerve 3. Ilioinguinal nerve 4. Lateral cutaneous nerve of the thigh 5. Femoral nerve 6. Genitofemoral nerve 7. Obturator nerve
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ilioinguinal nerve • formed in common with the iliohypogastric nerve.
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