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49 Cards in this Set
- Front
- Back
What two plexuses supply the lower limb?
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-lumbar plexus
-sacral plexus |
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The lumbar plexus comes from what spinal nerves?
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L1-L4
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Where is the lumbar plexus located?
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in lower abdominal cavity, against muscles of posterior body wall
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What two nerves are the major motor nerves arising from lumbar plexus?
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femoral and obturator nerves
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What is the lumbosacral trunk?
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where part of L4 spinal nerve also joins with L5 nerve
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Where is the lumosacral trunk?
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passes over pelvic brim into pelvis -- contributes to sacral plexus
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Where is the femoral triangle?
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upper 1/3 of anterior thigh
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What forms the femoral triangle?
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-inguinal ligament -- superior border
-sartorius m. -- lateral border -adductor longus m. -- medial border -iliopsoas and pectineus m. -- floor (underlie femoral vein, artery, and nerve) |
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What runs through the femoral triangle?
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(from medial to lateral) femoral vein, femoral artery, femoral nerve
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What region(s) does the femoral nerve innervate?
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anterior hip and thigh
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The femoral n. comes from what plexus and spinal nerves?
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-lumbar plexus
-L2-L4 |
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Where is the femoral nerve located?
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-runs inferiorly through pelvis in groove between iliacus and psoas major m. (on lateral side of psoas major muscle)
-then passes under inguinal ligament with iliopsoas m. and enters femoral triangle |
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What innervates the iliacus muscle?
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femoral nerve
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Immediately after the femoral nerve enters the femoral triangle, what does it do?
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divides into several branches
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What 3 muscles will the branches of the femoral triangle innervate?
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-sartorius m.
-all 4 parts of quadriceps femoris m. -pectineus m. |
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What innervates the medial thigh?
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obturator nerve
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What plexus does the obturator nerve come from?
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lumbar plexus
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Orientation of obturator nerve?
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-within pelvis, runs inferiorly on medial side of psoas major m.
-exits pelvis through obturator foramen to enter medial thigh |
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Obturator n. supplies all medial thigh muscles except ?
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pectineus and hamstring part of adductor magnus
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What muscles (names) does the obturator nerve supply?
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-gracilis m.
-adductor longus m. -adductor brevis m. -obturator externus m. -adductor part of adductor magnus m. |
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What spinal nerves is the sacral plexus from?
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L4-S4
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Where is the sacral plexus located?
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within true pelvis, lying on surface of piriformis m.
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What 3 nerves does the sacral plexus form?
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-superior gluteal nerve
-inferior gluteal nerve -sciatic nerve |
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What innervates the gluteal region?
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-superior gluteal nerve
-inferior gluteal nerve -several small nerves from sacral plexus |
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Orientation of superior gluteal nerve?
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exits greater sciatic foramen at superior margin of piriformis m.
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What muscles does the superior gluteal nerve supply?
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-gluteus medius
-gluteus minimus -tensor faciae latae |
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Orientation of the inferior gluteal nerve?
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exits greater sciatic foramen at inferior margin of piriformis
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What muscle(s) does the inferior gluteal nerve supply?
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gluteus maximus only!
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What muscles do the several small nerves from sacral plexus supply?
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-piriformis
-quatratus femoris -superior and inferior gemelli -obturator internus |
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What innervates the posterior thigh?
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tibial and common fibular divisions of sciatic nerve
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Sciatic nerve is derived from ____ and is the _____ nerve in the body
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-sacral plexus
-largest |
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Location of sciatic nerve?
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-emerges through greater sciatic foramen at inferior margin of piriformis m.
-then runs inferiorly through posterior thigh, deep to long head of biceps femoris m. |
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The sciatic nerve divides into what?
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-tibial division of sciatic nerve
-common fibular of sciatic nerve |
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The tibial division of sciatic nerve is on what side of the sciatic nerve?
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medial
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What muscles does the tibial division of sciatic nerve supply?
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-semitendinosus
-semimembranosus -long head of biceps femoris -hamstring part of adductor magnus |
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What side is the common fibular division of sciatic nerve on?
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lateral side
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What muscle(s) does the common fibular division of sciatic nerve supply?
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short head of biceps femoris
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The two divisions remain together as sciatic nerve until ?
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they separate in distal 1/3 of thigh (at upper border of popliteal fossa)
-tibial nerve -common fibular nerve |
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What does the politeal fossa contain (not muscles)?
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-popliteal artery and vein
-tibial nerve -common fibular nerve |
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Location of tibial nerve?
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-runs vertically through center of popliteal fossa
-passes deep to gastrocnemius and soleus, then into deep posterior compartment of leg -passes behind medial malleolus and enters medial side of plantar foot |
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Tibial nerve supplies what region(s)?
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all muscles of superficial and deep posterior leg
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What does the tibial nerve divide into?
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medial and lateral plantar nerves of foot
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What supplies the intrinsic muscles of foot?
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medial and lateral plantar nerves
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Location of common fibular nerve?
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-follows tendon of biceps femoris muscle along superior-lateral border of popliteal fossa
-runs laterally around (superficial to) neck of fibula -enters lateral leg |
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What does the common fibular nerve divide into?
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-superficial fibular nerve
-deep fibular nerve |
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Location of superficial fibular nerve?
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runs down leg within lateral compartment
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What does the superficial fibular nerve supply?
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lateral compartment muscles
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Location of deep fibular nerve
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-passes deep - goes through lateral leg compartment and enters anterior leg compartment
-continues down anterior leg compartment -crosses ankle and continues onto dorsum of foot |
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What muscles does the deep fibular nerve supply?
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(all anterior compartment muscles)
-tibialis anterior -extensor digitorum longus -extensor hallucis longus -fibularis tertius -extensor digitorum brevis -extensor hallucis brevis |