Nerve supply: lower limb

Question 1

nerve supply of the lower limb: general

Answer 1

• lumbar plexus
• sacral plexus

lumbosacral plexus

Question 2

specific: lumbar plexus

Answer 2

• anterior (ventral) rami of L1-4

Question 3

specific: sacral plexus

Answer 3

• anterior (ventral) rami of L 4-5 (lumbosacral trunk)

- S1-4

Question 4

major branches: lumbar plexus (4)

Answer 4

• femoral n (L2-4)
• saphenous n
• obturator n (L2-4)
• lateral cutaneous n of the thigh (L2-3)

Question 5

major branches: sacral plexus (8)

Answer 5

• superior gluteal n
• inferior gluteal n
• n to quadratus femoris
• n to obturator internus
• post femoral cutaneous n of the thigh
• sciatic n
• tibial n and common peroneal n
• pudendal n

Question 6

motor distribution areas: femoral n

Answer 6

ant com thigh

- majority of ant com of thigh and leg medially

Question 7

motor distribution areas: obturator

Answer 7

medial com thigh

- inner thigh

Question 8

sciatic n variations: (3)

Answer 8

most common:
- non split inf to piriformis

early split:

• btw piriformis and inferiorly
• superior and inferiorly
• both btw the piriformis

Question 9

safe injection sites in the buttocks:

Answer 9

• from highest point of iliac crest
• plane through ischial tuberosity
• halfway draw line
• upper lateral quadrant best place

Question 10

peroneal nerve damage:

Answer 10

• from broken fibula

- drop foot -> affects gait

Question 11

arterial supply: from descending aorta superficial structures (3)

Answer 11

descending aorta - common iliac artery - external iliac a - femoral artery

Question 12

arterial supply: from descending aorta deeper structures

Answer 12

descending aorta - internal iliac a - pelvic/perineal structures/ obturator a, superior and inferior gluteal arteries

Question 13

arterial supply: from femoral artery anterior side

Answer 13

femoral a

• profunda femoris a
• popliteal a - ant tibial artery - dorsalis pedis a - tarsal/ arcuate/ 1st dorsal metatarsal a - deep plantar arch

Question 14

arterial supply: from femoral artery post side

Answer 14

femoral artery

• profundis femoris artery
• popliteal a - post tibial a - circumflex fibular a/ peroneal (fibular) a - lateral plantar a (- deep plantar arch - digital branch) / medial plantar a (- 4 plantar metatarsal a)

Question 15

major branches: femoral artery (5)

Answer 15

• profunda femoris
• superficial epigastric
• superficial circumflex iliac a
• superficial external pudendal a
• deep external pudendal a

Question 16

major branches: profunda femoris (3)

Answer 16

• perforating branches (4)

- medial and lateral circumflex

Question 17

major branches: obturator a (2)

Answer 17

• anterior branch

- post branch

Question 18

major branches: popliteal artery

Answer 18

• muscular branches
• genicular a
• ant tibial a
• post tibial a

Question 19

major branches: anterior tibial a

Answer 19

• ant medial malleolar a
• ant lateral malleolar a
• recurrent branch
• muscular branches
• continues as dorsalis pedis a

Question 20

major branches: post tibial artery

Answer 20

• circumflex fibular a
• fibular (peroneal) a
• perforating branch
• medial plantar a
• lateral plantar a

Question 21

major branches: lateral plantar a

Answer 21

continues as deep plantar arch

Question 22

major branches: deep plantar arch

Answer 22

• 4 plantar metatarsal aa
• 3 perforating branches
• digital branch

Question 23

major branches: dorsalis pedis artery

Answer 23

• tarsal arteries
• arcuate a
• 1st dorsal metatarsal a

Question 24

contents in femoral triangle:

Answer 24

• femoral nerve
• femoral sheath
• lymphatics in femoral canal
• femoral a
• femoral vein

Question 25

tendons and vessels at ankle:

Answer 25

- flexor digitorum longus tendon - tibialis post tendon - post tibial a - tibial n - flexor hallucis longus tendon

Question 26

venous drainage: from dorsal digital vein

Answer 26

dorsal digital - dorsal metatarsal - dorsal venous arch - small saphenous (- popliteal v)/ great saphenous (- femoral v) - external iliac - common iliac - vena cava

Question 27

venous drainage: from plantar digital

Answer 27

plantar digital - plantar metatarsal - deep plantar venous arch - medial and lateral plantar - post tibial - popliteal - femoral - external iliac - common iliac - inferior vena cava

Question 28

list lymphatic nodes:

Answer 28

- popliteal lymph nodes - superficial inguinal lymph nodes - deep inguinal lymph nodes

Question 29

areas drained: popliteal

Answer 29

- knee | - parts of leg and foot

Question 30

venous drainage: superficial inguinal

Answer 30

- lower part of anterolateral abdominal wall - gluteal region - external genitalia - perineum - all superficial lymphatics of lower limb

Question 31

venous drainage: deep inguinal

Answer 31

- penis - clitoris - deep lymphatics of lower limb