Lumbar plexus Flashcards
how does the lumbar plexus receive contribution from T12
by communication with the L1 nerve
what forms the lumbar plexus
anterior primary rami of L1-L3 and part of L4
what muscles are supplied by the muscular branches of the anterior primary rami of the lumbar plexus
quadratus lumborum, psoas major and psoas minor
L1 muscular branches will supply what muscles
quadratus lumborum and psoas minor
L2 muscular branches will supply what muscles
quadratus lumborum and both psoas muscles
L3 and L4 muscular branches will supply what muscles
quadratus lumborum and psoas major
the iliohypogastric nerve contains fibers from what spinal nerves
T12 and L1
after the iliohypogastric nerve gives off the lateral cutaneous branch what does it continue as
the anterior cutaneous branch
what does the anterior cutaneous branch (from the iliohypgsatric nerve) supply
skin of the pubic region
what does the lateral cutaneous branch of the iliohypogastric nerve supply
posterolateral gluteal region
what roots make up the ilioinguinal nerve
T12 and L1
what does the ilioinguinal nerve supply with sensory innervation
skin of the upper medial thigh, base of penis, anterior scrotum (in males), mons pubis and labium majus (in females)
what muscles does the ilioinguinal nerve supply
internal abdominal oblique muscle , and transverse abdominal muscles
what muscles does the iliohypogastric nerve supply
internal abdominal oblique, and transverse abdominal
what roots is the genitofemoral nerve composed of
L1 and L2
what two branches does the genitofemoral nerve divide into
gential branch and femoral branch
what does the genital branch of the genitofemoral nerve supply with motor innervation
cremaster muscle
what does the genital branch of the genitofemoral nerve supply with sensory innervation
skin of the superior-anterior scrotum(in males), skin of the mons pubs and labium majus(in females)
what does the femoral branch of the genitofemoral nerve supply
skin of the upper anterior thigh
what roots is the lateral cutaneous nerve of the thigh composed of
L2 and L3
what does the lateral cutaneous nerve of the thigh supply
skin of the lateral thigh, superior to the knee
what is the largest branch of the lumbar plexus
femoral nerve
what roots is the femoral nerve composed of
L2,L3, and L4
what branches does the femoral nerve give off in the abdomen
muscular branches to the iliacus and the pectineus as well as a few fibers to the femoral A.
what are the 3 nerves that arise from the anterior division of the femoral nerve
the intermediate cutaneous nerve of the thigh, the medial cutaneous nerve of the thigh, and the nerve to the sartorius
what does the intermediate cutaneous nerve of the thigh supply
skin on the anterior thigh down to the knee
what will the lateral branch of the intermediate cutaneous nerve of the thigh communicate with
the femoral branch of the genitofemoral nerve
what does the medial cutaneous nerve of the thigh supply
skin of the medial thigh, medial knee, and knee across to the lateral side of the patella
the medial cutaneous nerve of the thigh communicates with the saphenous nerve to supply what?
skin of the medial leg through communications with the saphenous nerve
what muscle does the nerve to the sartorius supply
the sartorius
what muscles does the posterior division of the femoral nerve innervate
sartorius, and quadriceps (rectus femoris, vastus lateralis, vastus medialis, vastus intermedialis)
what does the vascular branches of the posterior division supply
the femoral artery and its branches
what does the saphenous nerve supply
skin medial and anterior to the patella, skin of the medial leg and foot
what nerve is the patellar reflex testing
femoral nerve
in most cases what do sensory dificits in the lumbars going to relate back to
disc issues
what roots make up the obturator nerve
L2,L3, an L4
what is the principal contributor to the obturator nerve
L3
after the obturator nerve splits into an anterior and posterior branch what separates them
initially the obturator externus and then the adductor brevis
branches that are sent from the obturator nerve to communicate with the femoral nerve form what?
the subsartorial plexus
what does the subsartorial plexus contribute to
the skin on the medial thigh
what does the terminal portion of the anterior branch of the obturator nerve supply
the femoral artery
the anterior branch of the obturator nerves sends articular branches to what joint
the hip joint
the anterior branch of the obturator nerves sends muscular branches to what muscles
adductor longus, gracilis, pectineus (usually), adductor brevis(usually)
if the accessory obturator nerve is present what may send fibers to connect with it
the anterior branch of the obturator nerve
if the anterior branch of the obturator nerves sends fibers to communicate with the medial cutaneous nerve of the thigh and the saphenous nerve what will it contribute supply to
the skin on the upper medial side of the leg
what muscles does the posterior branch of the obturator nerve supply
obturator externus and adductor magnus as well as the adductor brevis if it is not already supplied by the anterior branch
what joint does the posterior branch of the obturator n send articular fibers to
the knee joint
what are clinical considerations associated with the lumbar plexus
muscular weakness, and sensory deficits
