lumbosacral plexus

Question 1

which roots does the iliohypogastric nerve consist of?

Answer 1

(T12), L1

Question 2

which nerve roots does the ilioinguinal nerve consist of?

Answer 2

L1

Question 3

which muscles are innervated by the iliohypogastric and the ilioinguinal nerve?

Answer 3

internal oblique
transversus abdominis

Question 4

which nerve roots does the genitofemoral nerve consist of?

Answer 4

L1, L2

Question 5

which muscles are innervated by the genitofemoral nerve?

Answer 5

cremasteric muscle

Question 6

which nerve roots does the lateral cutaneous nerve consist of?

Answer 6

L2, L3

Question 7

what is the sensory innervation of the lateral cutaneous nerve?

Answer 7

anterior and lateral thigh down to the level of the knee

Question 8

which nerve roots does the obturator nerve consist of?

Answer 8

L2, L3, L4

Question 9

which muscles does the obturator nerve innervate?

Answer 9

obturator externus
adductor longus, brevis and magnus
gracilis

Question 10

which nerve roots does the femoral nerve consist of?

Answer 10

L2, L3, L4

Question 11

which muscles does the femoral nerve innervate?

Answer 11

iliacus
pectineus
sartorius
vastus lateralis, medialis and intermedius
rectus femoris

Question 12

which nerve roots does the superior gluteal nerve consist of?

Answer 12

L4, L5, S1

Question 13

which muscles are innervated by the superior gluteal nerve?

Answer 13

gluteus minimus
gluteus medius
TFL

Question 14

which nerve roots does the inferior gluteal nerve consist of?

Answer 14

L5, S1, S2

Question 15

which muscles are innervated by the inferior gluteal nerve?

Answer 15

gluteus maximus

Question 16

which nerve roots does the sciatic nerve consist of?

Answer 16

L4, L5, S1, S2, S3

Question 17

in which branches does the sciatic nerve devide?

Answer 17

tibial nerve
common peroneal nerve

Question 18

which muscles does the sciatic nerve innervate?

Answer 18

biceps femoris
semimebranosus
semitendinosus
adductor magnus

Question 19

which muscles does the tibial nerve innervate?

Answer 19

gastrocnemius
soleus
tibialis posterior
popliteus
plantaris
flexor digitorum longus
flexor hallucis longus

Question 20

which muscles does the common peroneal nerve innervate?

Answer 20

tibialis anterior
extensor digitorum longus and brevis
peroneus/fibularis longus and brevis
peroneus/fibularis tertius

Question 21

which nerve roots does the posterior femoral cutaneous nerve consist of?

Answer 21

S1, S2, S3

Question 22

what sensory innervation does the posterior femoral cutaneous nerve have?

Answer 22

skin of the posterior thigh and leg
skin of the perineum

Question 23

which nerve roots does the pudendal nerve consist of?

Answer 23

S2, S3, S4

Question 24

which muscles does the pudendal nerve innervate?

Answer 24

skeletal muscles in the perineum
external and internal urethral spinchter
levator ani

Question 25

which reflexes and motor tests are performed for L1?

Answer 25

reflex: none
motor: hip flexion

Question 26

which reflexes and motor tests are performed for L2?

Answer 26

reflex: none
motor: iliopsoas muscle

Question 27

which reflexes and motor tests are performed for L3?

Answer 27

reflex: femoral nerve (patellar reflex)
motor: hip flexion, knee extension

Question 28

which reflexes and motor tests are performed for L4?

Answer 28

reflex: femoral nerve (patella reflex)
motor: ankle dorsiflexion (tibialis anterior), quadriceps and hip adductors

Question 29

which reflexes and motor tests are performed for L5?

Answer 29

reflex: internal hamstring
motor: great toe extension ankle dorsiflexion

Question 30

which reflexes and motor tests are performed for S1?

Answer 30

reflex: tibial nerve (achilles)
motor: ankle plantar flexion (reach for the sun)

Question 31

which reflex and motor tests are performed for S2-S5?

Answer 31

reflex: anal ‘wink’
motor: clawing of toes