Lumbar/Sacral Plexus

Question 1

L1

Answer 1

Spinal Nerve -iliohypogastric -ilioinguinal

-Sensory to groin

Question 2

L1+L2

Answer 2

Genitofemoral -Sensory to genitals

Question 3

L2+L3

Answer 3

Lateral cutaneous nerve of the thigh
lateral femoral cutaneous
=Sensory to lateral thigh

Question 4

L2, L3, L4

Answer 4

Femoral nerve -anterior thigh
=Rectus femoris
=vastus (medialis, lateralis, intermedialis)
=Sortorious =Pectinous =Iliopsoas

Question 5

L2, L3, L4 part 2

Answer 5

Obturator nerve

- Innervates obturator externus, and medial thigh

Question 6

L5, S1, S2

Answer 6

Inferior gluteal nerve =gluteus maximus

- Leaves the pelvis through the greater sciatic foramen below the piriformis.

Question 7

S1, S2

Answer 7

Nerve to piriformis

-Piriformis

Question 8

L4-S3

Answer 8

Sciatic =Posterior thigh
>semimembranosus >biceps femoris
>semitendinosus >adductor magnus

Question 9

S1,S2,S3

Answer 9

Posterior cutaneous nerve of the thigh

-Sensory to posterior thigh

Question 10

S2,S3,S4

Answer 10

Pudental (Pelvic mm)
=ischiocavernosus =Bulbospongiosus
=superior/deep transverse perineal mm
=levator ani

Question 11

L4-S1

Answer 11

Superior Gluteal Nerve

• Leaves pelvis through greater sciatic foramen above the piriformis.
• Innervates the gluteus medius, gluteus minimus, and the TFL.

Question 12

L5-S2

Answer 12

Nerve to the obturator internus muscles

• Leaves pelvis through greater sciatic foramen below piriformis and enters perineum through lesser sciatic foramen.
• Innervates the obturator internus and superior gemellus muscles.