lower extremity blocks

Question 1

what nerve roots make up the lumbar plexus

Answer 1

L1 - L4 (L1 - L5 vertebra)
primarily innervates the front of the leg

Question 2

what nerve roots make up the sacral plexus

Answer 2

L4 - S4
primarily innervates that back of the leg

Question 3

what nerves does the lumbar plexus give rise to

Answer 3

• iliohypogastric
• ilioinguinal
• genitofemoral
• lateral femoral cutaneous
• obturator
• femoral

Question 4

what nerves does the sacral plexus give rise to

Answer 4

• superior gluteal
• inferior gluteal
• posterior cutaneous
• pudendal
• sciatic

Question 5

the foot and ankle are innervated by what nerves

Answer 5

• saphenous
• sural
• superficial peroneal
• deep peroneal
• posterior tibial

Question 6

what 3 nerves innervate the lower extremity

Answer 6

• lateral femoral cutaneous
• obturator
• femoral

Question 7

lateral femoral cutaneous arises from what roots

Answer 7

L2 - L3

Question 8

femoral arises from what roots

Answer 8

L2 - L4

Question 9

obturator arises from what nerve roots

Answer 9

L2 - L4

Question 10

sciatic nerve arises from what nerve roots

Answer 10

L4 - S3

Question 11

tibial nerve arises from what nerve roots

Answer 11

L4 - S3

Question 12

common fibular arises from what nerve roots

Answer 12

L4 - S3

Question 13

pathway of lateral femoral cutaneous nerve

Answer 13

• emerges from lateral border of posas major
• transverses the iliac muscle toward iliac spine
• passes under inguinal ligament
• provides sensory to the lateral aspect of the thigh

Question 14

pathway of the obturator nerve

Answer 14

• emerges from medial border of psoas major at the sacroiliac joint, covered by the iliac artery and vein
• passes in the pelvis and runs to obturator canal

Question 15

what nerve is frequently in pelvic surgery

Answer 15

• obturator nerve

Question 16

area anterior femoral nerve innervates

Answer 16

• anterior provides innervation to anterior surface of the thigh and sartorius muscle

Question 17

area posterior femoral nerve innervates

Answer 17

• posterior provides innervation to the quads, knee joint, and medial ligament

Question 18

how to confirm needle placement with psoas compartment block

Answer 18

• stimulation of the quads via nerve stimulation

Question 19

where to inject a femoral nerve block

Answer 19

• 1 cm lateral to femoral artery and 1 cm inferior to inguinal ligament

Question 20

combination of what blocks complete analgesia for the lower extremity

Answer 20

• sciatic and femoral block

Question 21

what area does the sciatic nerve innervate

Answer 21

• skin of back of the thigh, skin of leg, muscles of lower leg and foot