Lumbosacral Plexus and Vasculature

Question 1

the aorta divides into what in the lower part of the body?

Answer 1

right and left common iliac arteries

Question 2

what level of spinal column does the aorta divide?

Answer 2

L4

Question 3

common iliac arteries branch into what?

Answer 3

internal and external iliac arteries

Question 4

what does the external iliac artery become? when does the name change?

Answer 4

femoral artery once it passes under the inguinal ligament

Question 5

how does the internal iliac artery branch?

Answer 5

into an anterior and posterior division

Question 6

what does the anterior division of the internal iliac artery provide?

Answer 6

pelvic viscera structures in the perineum

Question 7

what is the perineum?

Answer 7

external genitalia

Question 8

what does the posterior division of the internal iliac artery provide?

Answer 8

gluteal muscles/region
lower back
sacral nerves

Question 9

name the three branches of the posterior division of the internal iliac artery

Answer 9

iliolumbar
lateral sacral
superior gluteal

Question 10

what does the iliolumbar artery provide?

Answer 10

psoas muscle

Question 11

what does the lateral sacral artery provide?

Answer 11

meninges/spinal roots

Question 12

what does the superior gluteal artery provide?

Answer 12

gluteal muscles

Question 13

name the three branches of the internal iliac anterior division to know

Answer 13

obturator
inferior gluteal
internal pudendal

Question 14

what does the obturator artery provide? what is it a branch of?

Answer 14

medial thigh muscles

branch of the anterior division of the internal iliac

Question 15

what does the inferior gluteal artery provide? what is it a branch of?

Answer 15

gluteal muscles

branch of the anterior division of the internal iliac

Question 16

what does the internal pudendal artery provide? what is it a branch of?

Answer 16

perineum

branch of the anterior division of the internal iliac

Question 17

the lumbar portion of the lumbosacral plexus is considered to include ventral rami of what spinal roots?

Answer 17

L1 to L4

Question 18

name the nerve that is a branch of off the L1 ventral rami

Answer 18

ilioinguinal nerve

Question 19

what is the spinal root of the ilioinguinal nerve?

Answer 19

L1

Question 20

what does the ilioinguinal nerve do?

Answer 20

sensation in scrotum/labia majora

Question 21

the lateral femoral cutaneous nerve has what spinal roots?

Answer 21

L2 and L3

Question 22

what is the role of the lateral femoral cutaneous nerve?

Answer 22

sensation to anterolateral thigh

Question 23

what is a common nerve to get impinged in the inguinal ligament area?

Answer 23

lateral femoral cutaneous nerve

Question 24

the genitofemoral nerve has what spinal roots?

Answer 24

L1 and L2

Question 25

name the branches of the genitofemoral nerve

Answer 25

genital and femoral

Question 26

what is the action of the femoral branch of the genitofemoral nerve?

Answer 26

sensation to small area of proximal/anterior thigh

Question 27

what is the action of the genital branch of the genitofemoral nerve?

Answer 27

traverses inguinal canal and innervates the scrotum/ labia majora

Question 28

what two major nerves have spinal roots of L234?

Answer 28

femoral nerve | obturator nerve

Question 29

what is the femoral nerves spinal roots?

Answer 29

L234

Question 30

what is the obturator nerves spinal roots?

Answer 30

L234

Question 31

what is the action of the femoral nerve?

Answer 31

innervates the anterior thigh muscles

Question 32

what is the action of the obturator nerve?

Answer 32

innervates the medial thigh muscles (adductors)

Question 33

where does the obturator nerve pass through?

Answer 33

the obturator canal

Question 34

the sacral plexus is considered to be what nerve roots?

Answer 34

L4 L5 S1234

Question 35

what is the lumbosacral trunk?

Answer 35

nerve branch of the sacral plexus

Question 36

what are the nerve roots of the lumbosacral trunk?

Answer 36

L4 and L5

Question 37

what is the action of the lumbosacral trunk?

Answer 37

joins with the large sacral nerves

Question 38

what is the sciatic nerve roots?

Answer 38

union of L4, L5 S123

Question 39

what is the role of the sciatic nerve?

Answer 39

innervate many lower extremity muscles

Question 40

what is the biggest nerve in the body?

Answer 40

sciatic nerve

Question 41

what are the nerve roots of the superior gluteal nerve?

Answer 41

L45 and S1

Question 42

what are the nerve roots of the inferior gluteal nerve?

Answer 42

L5 S1 S2

Question 43

what is the action of the superior gluteal nerve?

Answer 43

innervates hip abductors

Question 44

what is the action of the inferior gluteal nerve?

Answer 44

innervated gluteus maximus

Question 45

what are the nerve roots of the posterior femoral cutaneous nerve?

Answer 45

S123

Question 46

what is the action of the posterior femoral cutaneous nerve?

Answer 46

sensory innervation to the posterior thigh region

Question 47

what are the nerve roots of the pudendal nerve?

Answer 47

S234

Question 48

what two canals does the pudendal nerve traverse?

Answer 48

exits the greater sciatic foramen and enters the lesser sciatic foramen

Question 49

what is the action of the pudendal nerve?

Answer 49

innervates the perineum

Question 50

name the five nerves of the lumbar plexus

Answer 50

``` ilioinguinal nerve lateral femoral cutaneous nerve genitofemoral nerve femoral nerve obturator nerve ```

Question 51

name the six nerves of the sacral plexus to know

Answer 51

``` sciatic nerve lumbosacral trunk superior gluteal nerve inferior gluteal nerve posterior femoral cutaneous nerve pudendal nerve ```