Lower Limb Nerves

Question 1

Lumbar plexus Ventral rami consists of which ones?

Answer 1

L1-4

Question 2

Lumbar plexus contained within?

Answer 2

psoas major

Question 3

Lateral border of Lumbar plexus, what 3 branches?

Answer 3

Ilioinguinal/iliohypogastric
lateral cuaneous nerve of thigh
femoral nerve

Question 4

which nerve roots for:
Ilioinguinal/iliohypogastric
lateral cuaneous nerve of thigh
femoral nerve

Answer 4

(L1) Ilioinguinal/iliohypogastric
(L2,3) lateral cuaneous nerve of thigh
(L2,3,4)femoral nerve

Question 5

Anterior surface of Lumbar plexus has which nerve?

Answer 5

genitofemoral nerve (L1,2)

Question 6

Medial border of Lumbar plexus has which nerve?

Answer 6

Obturator nerve

Question 7

why more likely to have herniation post-appendectomy?

Answer 7

ilioinguinal/iliohypogastric could be cut

Question 8

Lateral cutaneous nerve innervates? tucks near? problem when?

Answer 8

innervates skin down lateral thigh

tucks near ASIS: problem in obese/pregnancy

Question 9

what does femoral branch of genitofemoral nerve innervate?

Answer 9

triangle of skin above inguinal ligament

Question 10

femoral nerve runs where through groin?

Answer 10

in the gutter between iliacus and psoas underneath inguinal ligament

Question 11

sacral plexus is which roots? where do they come on to?

Answer 11

S1-4
lumbosacral (L4,5)
joins on piriformis

Question 12

when does femoral nerve divide?

Answer 12

just distal (2.5cm) to ligament

Question 13

Femoral nerve motor?

Answer 13

quads
sartorius
pectineus

Question 14

Femoral nerve sensory?

Answer 14

medial thigh, knee and ankle

Question 15

Femoral nerve articular branches?

Answer 15

hip and knee

Question 16

Femoral nerve inside or outside of vascular bundle?

Answer 16

outside of sheath

Question 17

Obturator nerve comes from which roots?

Answer 17

L2,3,4 anterior divisions

Question 18

Obturator nerve does which compartment of thigh?

Answer 18

medial

Question 19

Obturator nerve motor to?

Answer 19

pectineus
adductor magnus (hamstring part)

Question 20

Obturator nerve sensory to?

Answer 20

inferomedial thigh

Question 21

Obturator nerve articular branches?

Answer 21

to hip

Question 22

Sciatic nerve comprises of which nerve roots?

Answer 22

L4,5 S1,2,3 anterior and posterior divisions

Question 23

what in leg is not innervated by sciatic nerve?

Answer 23

skin at back of thigh via posterior cutaneous nerve

Question 24

sciatic nerve exits pelvis via?

Answer 24

Greater Sciatic Foramen

Question 25

sciatic motor?

Answer 25

All hamstrings except short head of biceps

Question 26

which nerve innervates Glut Max? Glut Med/Min?

Answer 26

Max: inferior gluteal nerve MedMin: superior gluteal nerve

Question 27

after sciatic nerve exits pelvis, where does it emerge?

Answer 27

beneath piriformis and runs posterior to hip joint so post-dislocation will take out sciatic

Question 28

sciatic nerve divides where?

Answer 28

apex of popliteal fossa

Question 29

how can you get part of sciatic nerve going through piriformis?

Answer 29

if it divides early into tibial and fibular components, fibularis could go through or overtop of piriformis

Question 30

Tibial nerve path?

Answer 30

through popliteal fossa>beneath fibrous soleus arch>follows tib post>post to medial malleolus>sole of foot>planter nerves

Question 31

Tibial nerve motor?

Answer 31

muscles of posterior leg and sole of foot

Question 32

Tibial nerve sensory?

Answer 32

post leg via sural nerve and sole of foot

Question 33

Fibularis longus innervated by?

Answer 33

common fibular nerve

Question 34

Which nerve winds around head of fibula?

Answer 34

common fibular nerve

Question 35

common fibular nerve comes from which nerve roots?

Answer 35

L4,5 S1,2

Question 36

Deep Fibular nerve motor to?

Answer 36

anterior compartment | EDB

Question 37

Deep Fibular nerve sensory?

Answer 37

1st toe cleft

Question 38

superficial fibular nerve motor?

Answer 38

lateral compartment | Fibularis longus and brevis then comes out sensory

Question 39

superficial fibular nerve sensory?

Answer 39

lower lateral leg, dorsum of foot