Lumbosacral plexus

Question 1

where is the lumbosacral plexus located?

Answer 1

posterior abdominal wall

Question 2

What makes up the lumbar plexus? sacral plexus? and the important cross over with innervation of the perineum and pelvic parasympathetic?

Answer 2

Lumbar = T12 - L5
Sacral = L4 - S3
Pudendal and splanchnic = S2-S4

Question 3

Spinal segment of genitofemoral nerve

Answer 3

L1 and L2

Question 4

Motor/sensory function of genitofemoral nerve

Answer 4

-Cutaneous: femoral triangle

Question 5

Spinal segment of lateral femoral cutaneous nerve

Answer 5

L2, L3

Question 6

Motor/Cutaneous function of lateral femoral cutaneous nerve

Answer 6

Cutaneous: lateral thigh

Question 7

Spinal segment of femoral nerve

Answer 7

L2, L3, L4 (posterior segments)

Question 8

Motor/cutaneous function of femoral nerve

Answer 8

All anterior compartment of the thigh

Question 9

Anterior femoral cutaneous nerve (from femoral) spinal segments

Answer 9

L2, L3

Question 10

Motor/cutaneous function of anterior femoral cutaneous nerve

Answer 10

Cutaneous: anterior and medial thigh

Question 11

Saphenous nerve (from femoral nerve) spinal segments

Answer 11

L4

Question 12

Motor/cutaneous function of saphenous nerve

Answer 12

Cutaneous: Anterior medial leg and medial foot

Question 13

Obturator nerve spinal segments

Answer 13

L2, L3, L4 (anterior divisions)

Question 14

Motor/Cutaneous function of obturator nerve

Answer 14

Motor: Medial thigh
Cutaneous: small distribution to distal medial thigh

Question 15

Lumbosacral trunk spinal segment

Answer 15

L4, L5 - contribution of the lumbar plexus to the sacral plexus

Question 16

Spinal segment of superior gluteal nerve

Answer 16

L4, L5, S1 (posterior divisions)

Question 17

Motor/ cutaneous function of superior gluteal nerve

Answer 17

Motor: gluteus medius, gluteus minimus, tensor fascia latae

Question 18

Nerve to quadratus femoris spinal segments

Answer 18

L4, L5, S1 (anterior division)

Question 19

Motor/cutaneous function of nerve to quadratus femoris

Answer 19

Motor: quadratus femoris and inferior gemellus

Question 20

Spinal segments of inferior gluteal nerve

Answer 20

L5, S1. S2 (posterior division)

Question 21

Motor/cutaneous function of inferior gluteal nerve

Answer 21

Motor: Gluteus maximus

Question 22

Spinal segments of nerve to obturator internus

Answer 22

L5, S1, S2 (anterior divison)

Question 23

Motor/cutaneous function of nerve to obturator internus

Answer 23

Motor: obturator internus, superior gemellus

Question 24

Spinal segments of posterior femoral cutaneous nerve

Answer 24

S1, S2, S3

Question 25

Motor/cutaneous function of posterior femoral cutaneous nerve

Answer 25

Cutaneous: Posterior thigh

Question 26

Spinal segments of sciatic nerve

Answer 26

L4, L5, S1, S2, S3 | -Made of common fibular nerve and tibial nerve

Question 27

Spinal segments of common fibular nerve

Answer 27

L4, L5, S1, S2 (posterior division)

Question 28

Motor/cutaneous function of common fibular nerve

Answer 28

Cutaneous: posterior leg and lateral leg | Dorsal and lateral foot

Question 29

Motor/cutaneous function of deep fibular nerve (from common fibular nerve)

Answer 29

Motor: Anterior leg, Dorsal foot

Question 30

Motor/cutaneous function of superficial fibular nerve

Answer 30

Motor: lateral leg Cutaneous: Distal lateral leg and dorsal foot

Question 31

Spinal segments of tibial nerve

Answer 31

L4, L5, S1, S2, S3 (anterior divisions)

Question 32

Motor/cutaneous function of tibial nerve

Answer 32

Motor: posterior compartments of thigh and leg and sole of foot Cutaneous: posterior leg and sole of foot