Lumbosacral Plexus

Question 1

The lumbar plexus is comprised of the anterior rami of which spinal nerves?

Answer 1

T12, L1-L4

Question 2

The sacral plexus is comprised of the anterior rami of which spinal nerves?

Answer 2

L4-S4

Question 3

Name the nerves that comprise the lumbar plexus

Answer 3

Iliohypogastric nerve (T12-L1)
Ilioinguinal nerve (L1)
Genitofemoral nerve (L1-L2)
Obturator nerve (L2-L4)
Lateral femoral cutaneous nerve (L2-L3)
Femoral nerve (L2-L4)

Question 4

Name the nerves that comprise the sacral plexus

Answer 4

Superior (L4-S1) and inferior (L5-S2) gluteal nerves
Pudendal nerve (S2-S4)
Posterior femoral cutaneous nerve (S1-S3)
Sciatic nerve (L4-S3)

Question 5

What are the spaces in the inguinal region?

Answer 5

Muscular (lateral femoral cutaneous nerve, femoral nerve)
Vascular (genitofemoral nerve)
Inguinal canal (ilioinguinal nerve, genitofemoral nerve)

Question 6

IH and IL nerves are motor to which structures?

Answer 6

Lower internal obliques and transversus abdominis

Question 7

GF nerves are motor to which structures?

Answer 7

Cremaster in spermatic cord

Question 8

IH, IL and GF nerves are sensory to ________

Answer 8

Skin over upper lateral thigh and inguinal region, anterior and medial thigh

Question 9

Where does the IH nerve pass through?

Answer 9

Above psoas major

Question 10

Where does IL nerve pass through?

Answer 10

Above psoas major and in inguinal canal

Question 11

Where does GF nerve pass from?

Answer 11

Pierces psoas major and travels under inguinal ligament into inguinal canal

Question 12

Where does LFC pass from?

Answer 12

Between psoas and iliacus

Question 13

LFC is sensory to _________

Answer 13

Skin over antero-lateral thigh, down to knee

Question 14

What is meralgia paresthetica?

Answer 14

LFC entrapment under the inguinal ligament that causes pain in lateral thigh

Question 15

Where does the obturator nerve travel?

Answer 15

Between psoas and iliacus through obturator foramen into medial thigh

Question 16

The obturator nerve is motor to ____________ and sensory from ___________

Answer 16

Medial compartment of the thigh; skin of medial thigh and hip joint capsule

Question 17

Where does the femoral nerve travel?

Answer 17

Between psoas and iliacus, under inguinal ligament into thigh

Question 18

The femoral nerve is motor to ___________

Answer 18

Anterior thigh

Question 19

The femoral nerve is sensory from skin of anterior thigh as ____________

Answer 19

Anterior femoral cutaneous nerve

Question 20

The femoral nerve is sensory from skin of medial leg as _____________

Answer 20

Saphenous nerve

Question 21

The sciatic nerve is motor to ________ and sensory to _________________

Answer 21

Hamstrings and distal muscles below the knee; distal limb below knee, except region covered by saphenous nerve

Question 22

The PFC is sensory only to ___________

Answer 22

Posterior thigh, ends in popliteal region

Question 23

The inferior cluneal nerve is sensory only to ____________

Answer 23

Inferior buttocks