Lumbar and Sacral Plexus

Question 1

Nerves of the lumbar plexus?

Answer 1

• iliohypogastric
• ilioinguinal
• genitofemoral
• lateral cutaneous
• obturator
• femoral

Question 2

What nerve roots does the lumbar plexus arise from?

Answer 2

L1-L5 (T12-subcostal)

Question 3

Which 2 nerves arise from L1?

Answer 3

1. iliohypogastric

2. ilioinguinal

Question 4

Which nerve roots does the genitofemoral nerve arise from? (2f2)

Answer 4

L1 and L2

Question 5

L2 and L3 nerve roots give rise to…

Answer 5

lateral cutaneous nerve of the thigh

Question 6

Iliohypogastric; motor and sensory innervation

Answer 6

M; transversus abdominus and internal oblique

S; lateral region of gluteus muscle

Question 7

Ilioinguinal; motor and sensory innervation

Answer 7

M; transversus abdominus and internal oblique

S; skin of scrotum, skin over upper penis, labium majora, mons pubis

Question 8

Functions of the genitofemoral nerve

Answer 8

Genital branch:
M - cremaster muscle
S - skin over scrotum, mons pubis, labia majora

Femoral branch: sensory innervation inner thigh

Question 9

Does the lateral cutaneous nerve have any motor functions? What functions does it have?

Answer 9

• no motor functions

- sensory innervation to lateral thigh

Question 10

What does the femoral nerve supply?

Answer 10

anterior compartment of the thigh

• quadriceps femoris
• iliacus
• sartorius
• pectinius

Question 11

What does the obturator nerve supply?

Answer 11

medial compartment of the thigh

• adductor magnus
• adductor brevis
• adductor longus
• obturator externus
• gracilis

Question 12

Which nerves run under the inguinal ligament?

Answer 12

• lateral femoral cutaneous

- femoral nerve

Question 13

Which nerve roots does the femoral and obturator nerve arise from?

Answer 13

L2, L3, L4

Question 14

Which nerve root connects the lumbar plexus to the sacral plexus?

Answer 14

L4 and L5