Lumbar plexus

Question 1

The lumbar plexus is created by
spinal nerves

Answer 1

T12-L4.

Question 2

The lumbar plexus is housed within
the

Answer 2

psoas major; Between the two heads of origin

Question 3

Primary Nerves

Answer 3

 Femoral Nerve
 Obturator nerve

Question 4

Secondary nerves

Answer 4

 Iliohypogastric nerve
 Ilioinguinal nerve

Question 5

Femoral Nerve Pathway

Answer 5

 Leaves plexus
 Travels anterior/inferior
 Exits pelvis deep to inguinal ligament
 Travels through femoral triangle as lateral
neurovascular structure
 Travels distally down anterior thigh
 Terminates proximal to patello-femoral joint

Question 6

Femoral Nerve Innervates

Answer 6

 Psoas
 Iliacus
 Sartorius
 Quadriceps group

Question 7

Obturator Nerve Pathway

Answer 7

 Leaves plexus
 Travels inferior/medial
 Exits pelvis through obturator foramen
 Travels distally down medial thigh
 Terminates proximal to tibiofemoral joint

Question 8

Obturator Nerve Innervates

Answer 8

 Gracillis
 Adductors magnus, longus, brevis
 Pectineus
 Obturator externus

Question 9

Iliohypogastric Nerve Innervates

Answer 9

 Psoas
 Abdominal wall
 Pelvic floor

Question 10

Ilioinguinal Nerve Innervates

Answer 10

 Psoas
 Abdominal wall
 Pelvic floor

Question 11

Femoral Triangle
Structures creating the borders:

Answer 11

 Inguinal ligament - superior border
 Sartorius - lateral border
 Adductor longus - medial border

Question 12

Femoral Triangle
Structures within:

Answer 12

 Femoral nerve - lateral
 Femoral artery - intermediate
 Femoral vein - medial

Question 13

Femoral Nerve Origin

Answer 13

L2-L4

Question 14

Obturator Nerve Origin

Answer 14

L2-L4

Question 15

Myotome N. Hip Flexion

Answer 15

L1-L2

Question 16

Myotome N. Knee extension

Answer 16

L3

Question 17

Myotome N. Ankle Dorsi Flexion

Answer 17

L4

Question 18

Myotome N. Toe Extension

Answer 18

L5

Question 19

Myotome N. Ankle plantar Flexion

Answer 19

S1

Question 20

Myotome N. Knee Flexion

Answer 20

S2