Unit 5 - Lower Limb: Lumbosacral Plexus (Ex. IV)

Question 1

femoral n. (L2-L4)

Answer 1

iliopsoas
pectineus
sartorius
quadriceps femoris
cutaneous: saphenous n.

Question 2

S gluteal n. (L4-S1)

Answer 2

gluteus medius
gluteus minimus
tensor fasciae latae

Question 3

I gluteal n. (L5-S2)

Answer 3

gluteus maximus

Question 4

P femoral cutaneous n. (S1-S3)

Answer 4

P femoral cutaneous n.:

• I clunial nn.
• perineal branches

Question 5

direct branches

Answer 5

n. to piriformis (S1-S2) ==> piriformis
n. to obturator internus (L5-S1) ==> obturator internus; S gemellus
n. to quadratus femoris (L5-S1) ==> quadratus femoris; I gemellus

Question 6

common fibular n. (L4-S2)

Answer 6

direct branches from sciatic n. ==> short head of biceps femoris
superficial fibular n. ==> fibularis brevis and longus
deep fibular n.:
- tibialis A
- extensors digitorum brevis and longus
- extensors hallucis brevis and longus
- fibularis tertius

Question 7

tibial n. (L4-S3)

Answer 7

direct branches from sciatic n.:
  - semitendinosus
  - semimembranosus
  - long head of biceps femoris
  - hamstrings part of adductor magnus
tibial n.:
  - triceps surae
  - plantaris
  - popliteus
  - tibialis P
  - flexor digitorum longus
  - flexor hallucis longus
M plantar n.:
  - abductor hallucis
  - flexor digitorum brevis
  - M head of flexor hallucis brevis
  - 1st and 2nd lumbricals
  ==> proper plantar digital nn.
L plantar n.:
  - L head of flexor hallucis brevis
  - quadratus plantae
  - abductor digiti minimi
  - flexor digiti minimi
  - opponens digiti minimi
  - 3rd and 4th lumbricals
  - 1st-3rd plantar interossei
  - 1st-4th dorsal interossei
  - adductor hallucis
  ==> proper plantar digital nn.

Question 8

obturator n. (L2-L4)

Answer 8

direct: obturator externus
A branch:
  - adductor longus
  - adductor brevis
  - gracilis
  - pectineus
P branch: adductor magnus
cutaneous branch