Anatomy: Lumbosacral Plexus

Question 1

What divisions do the internal iliacs give?

Answer 1

anterior and posterior

Question 2

What does the anterior division of the internal iliac vascularize?

Answer 2

pelvic viscera and perineum

Question 3

What does the posterior division of the internal iliac vascularize?

Answer 3

gluteal muscles (superior gluteal)
lower back (iliolumbar)
cauda equina (lateral sacral)

Question 4

What nerve roots make up the lumbosacral plexus?

Answer 4

L1-S4

Question 5

What does the ilioinguinal nerve innervate? Root?

Answer 5

scrotum/labia majora

L1

Question 6

What does the lateral femoral cutaneous nerve innervate? Root?

Answer 6

anterolateral thigh sensation

L2-3

Question 7

What does the femoral nerve innervate? Root?

Answer 7

anterior thigh muscles (quads)

L2-4

Question 8

What does the obturator nerve innervate? Root?

Answer 8

medial thigh muscles (adductors)

L2-4

Question 9

What is the lumbosacral trunk?

Answer 9

joint L4-5 to sacral nerves

Question 10

What is the sciatic nerve? Root?

Answer 10

huge nerve that innervates a ton of muscles

L4-S3

Question 11

What does the superior gluteal nerve innervate?

Answer 11

hip abductors

L4-S1

Question 12

What does the inferior gluteal nerve innervate? Root?

Answer 12

gluteus maximus

L5-S2

Question 13

What does the poterior femoral cutaneous nerve innervate? Root?

Answer 13

posterior thigh sensation

S1-3