lumbar plexus

Question 1

L1 anterior rami

Answer 1

supplies quadratus lumborum and psoas major

Question 2

L2 anterior rami

Answer 2

supplies quadratus lumborum and both psoas muscles

Question 3

L3 and L4 anterior rami

Answer 3

supplies quadratus lumborum and psoas major

Question 4

iliohypogastric nerve

Answer 4

fibers from T12 and L1
supplies internal abdominal oblique, and transverseabdominal. also gives off two branches
lateral cutaneous branch which supplies skin of the posterolateral gluteal region
anterior cutaneous branch supplies skin of the pubic region

Question 5

ilioinguinal nerve

Answer 5

fibers from T12 and L1
supplies internal abdominal oblique, and transverse abdominal
cutaneous supply to the skin of the upper medial thigh, also supplies the base of the penis and anterior scrotum in men, and the mons pubis and labium majus in women

Question 6

genitofemoral nerve

Answer 6

fibers from L1 and L2
passes through psoas major muscleand divides into genital branch and femoral branch
genital branch - motor supply to the cremaster muscle and sensory to the skin of the superior anterior scrotumin men, and mons pubis and labium majus in women
femoral - supplies skin of the upper anterior thigh

Question 7

lateral cutaneous nerve of the thigh

Answer 7

fibers from L2 and L3

supplies skin of the lateral thigh superior to the knee

Question 8

Femoral nerve (abdominal)

Answer 8

fibers from L2 L3 and L4

supplies iliacus, and pectineus, also sends fibers to the femoral artery

Question 9

femoral (anterior division)

Answer 9

gives rise to three nerves
Intermediate cutaneous nerve of the thigh - supplies the anterior thigh down to the knee, also communicates with the femoral branch of the genitofemoral nerve
medial cutaneous nerve of the thigh - supplies the skin of the medial thigh, medial knee, and knee across to the lateral side of the patella
nerve to the sartorius - supplies sartorius muscle

Question 10

femoral (posterior division)

Answer 10

muscular branches - sartorius, rectus femoris, vastus lateralis, vastus medialis, vastus intermedialis
also sends vascular branches to femoral artery and saphenous nerve

Question 11

femoral nerve clinical considerations

Answer 11

patellar reflex and sensory deficits

Question 12

obturator nerve (anterior branch)

Answer 12

fibers from L2 L3 and L4
communicates with the femoral nerve forming subsartorial plexus which contributes to the skin of the medial thigh
supplies - adductor longus gracilis, pectinius, and adductor brevis
also sends articular branches to the hip joint

Question 13

obturator nerve (posterior branch)

Answer 13

supplies obturator externus, adductor magnus and possibly adductor brevis
sends articular fibers to the knee joint

Question 14

obturator clinical considerations

Answer 14

muscular weakness and sensory deficits