Manual 119-121: Nerves of Pelvis and Gluteal Region

Question 1

lumbar plexus

Answer 1

anterior primary rami

T12-part L4

Question 2

iliohypogastric n

Answer 2

T12/L1
- located at cranial end of lateral psoas major, crosses quadratus lumborus, passes iliac crest, enters internal surface of transversus abdominis and internal oblique

Question 3

branches off iliohypogastric n

Answer 3

• lateral cutaneous branches [posterior gluteal area]
• anterior cutaneous branches [hypogastic region]
• muschel branches to transversus abdominus and internal oblique

Question 4

ilioinguinal n

Answer 4

L1
- located lateral border psoas major, caudal to the iliohypogastric n, running parallel with the iliohypogastric n across quadratus lumborum to iliac crest and pierces transversus abdominis

Question 5

where do ilioinguinal n and iliohypogastric n communicate?

Answer 5

between tansversus abdominis and internal oblique

Question 6

what n goes with sperm cord through superficial inguinal ring

Answer 6

ilioinguinal

- supplies medial thigh, root of penis and anterior scrotum

Question 7

genitofemoral n

Answer 7

L1,2

- passes through psoas major to ventral surface

Question 8

genital branch of genitofemoral n

Answer 8

• joins spermatic cord/round ligament

- supplies lateral scrotum and adjacent thigh

Question 9

femoral branch of genitofemoral n

Answer 9

• lateral to genital branch
• deep to inguinal ligament in LATERAL FEMORAL SHEATH
• supplies skin over anterior thigh

Question 10

nerves off anterior division of L2-L4

Answer 10

obturator n L2-4

accessory obturator L3-4

Question 11

obturator n

Answer 11

L2-4

-located medial to psoas major, enters pelvis under iliac vessels, exits through obturator canal

Question 12

how often is accessory obturator n present

Answer 12

10%

Question 13

accessory obturator n

Answer 13

L3-4

• medial to psoas, leaves pelvis by passing superior to pubic ramis
• deep to pectineus in thigh giving off a muscular branch
• hip articular joint brnach

Question 14

nerves off the posterior division of L2-4

Answer 14

femoral L2-4

lateral femoral cutaneous L2-3

Question 15

femoral n

Answer 15

L2-4

• through the psoas major, distal b/w psoas major and iliacus
• leaves pelvis deep to inguinal ligament running with lateral femoral a

Question 16

lateral femoral cutaneous n L2-3

Answer 16

L2-3

• middle/lateral border psoas major, over iliacus, to ASIS
• inferior to inguinal ligament, over the sartorius

Question 17

supply of anterior and posterior branches of lateral femoral cutaneous n

Answer 17

anterior: skin over lateral/anterior thigh
posterior: skin lateral thigh from greater trochanter distally to mid-thigh

Question 18

if ilioinguinal n absent, what takes over its innervation

Answer 18

genitofemoral n

Question 19

sacral plexus

Answer 19

part L4-part S4

Question 20

location sacral plexus

Answer 20

medial to pififormis, converging at the greater sciatic foramen

Question 21

L4 =

Answer 21

nervus furcalis

part of both plexuses

Question 22

what branches of sacral plexus divide into anterior and posterior divisions?

Answer 22

all branches except S4 branch into anterior and posterior divisions

Question 23

nn off anterior division of sacral plexus

Answer 23

n to quadratus femoris/inferior gemellus L4-S1

n to obturator internus/superior gemellus L5-S2

Question 24

nn off posterior division of sacral plexus

Answer 24

n to piriformis
superior gluteal n
inferior gluteal n

Question 25

n to quadratus femoris

Answer 25

L4-S1

• supplies quadratus femoris and inferior gemellus
• goes through sciatic foramen ventral to the sciatic n
• sends articular branch to hip joint

Question 26

n to obturator internus

Answer 26

L5-S2

• supplies obturator internus and superior gemellus
• goes through greater sciatic foramen and reenters through less sciatic foramen to get to obturator internus

Question 27

n to piriformis

Answer 27

S2 or S1/2

Question 28

superior gluteal n

Answer 28

L4-S1

• goes through greater sciatic foramen superior to piriformis
• superior branch to gluteus minimus
• inferior branch to gluteus medius/minimus, tensor fascia latae

Question 29

inferior gluteal n

Answer 29

L5-S2

• goes through greater sciatic foramen, inferior to piriformis
• supplies gluteus maximus

Question 30

composition of sciatic n

Answer 30

anterior division L4-S3

posterior division L4-S2

Question 31

largest branch sacral plexus

Answer 31

sciatic n

also largest n in body

Question 32

what is supplied by sciatic n

Answer 32

posterior leg M
all M leg, foot, skin foot
most skin leg
all joints in LE

Question 33

what a accompanies the sciatic n in gluteal region

Answer 33

inferior gluteal a

also the posterior femoral cutaneous n

Question 34

2 phsyiologic n of sciatic (1 anatomic n)

Answer 34

tibial - anteiror L4-S3

common peroneal L4-S2

Question 35

posterior femoral cutaneous (off sciatic n)

Answer 35

S2-3A or S1/2 P

Question 36

branches off the posterior femoral cutaneous

Answer 36

gluteal branches -- inferior cluneal [lateral gluteus maximus]
perineal branches (medial to proximal thigh, perineusm. scrotum, base penis/labia majora)
femoral branches (skin posterior/medial thigh and popliteal fossa)
sural branches (skin distal popliteal fossa)

Question 37

coccygeal plexus

Answer 37

part S4, S5 and coccygeal anterior rami