Lumbar Plexus

Question 1

What nerves form the lumbar plexus?

Answer 1

anterior primary rami of T12-L3, part of L4

Question 2

How does the lumbar plexus receive fibers from T12?

Answer 2

communication with the L1 nerve

Question 3

What muscles do L1 anterior primary rami supply?

Answer 3

quadratus lumborum and psoas minor

Question 4

What muscles do L2 anterior primary rami supply?

Answer 4

quadratus lumborum and both psoas minor and major

Question 5

What muscles do L3 and L4 anterior primary rami supply?

Answer 5

quadratus lumborum and psoas major

Question 6

which nerve contains fibers from T12 and L1

Answer 6

Iliohypogastric nerve and Ilioinguinal Nerve

Question 7

What branch does the iliohypogastric nerve give off?

Answer 7

lateral cutaneous brach

Question 8

What does the lateral cutaneous branch supply?

Answer 8

sensory to the posterolateral gluteal region

Question 9

After the lateral cutaneous branches off, what does the iliohypogastric nerved become?

Answer 9

the anterior cutaneous branch

Question 10

What does the anterior cutaneous branch supply?

Answer 10

sensory to the skin of the pubic region

Question 11

What two muscles does the iliohypogastric nerve supply?

Answer 11

internal abdominal oblique and transverse abdominal

Question 12

What is the sensory function of the ilioinguinal nerve?

Answer 12

skin of the upper medial thigh
base of penis
anterior scrotum
mons pubis and labium majus

Question 13

what muscles do the ilioinguuinal nerve supply?

Answer 13

internal abdominal oblique and transverse abdominal muscle

Question 14

What nerve contains fibers from L1 and L2?

Answer 14

Genitofemoral nerve

Question 15

After passing through the psoas major, the Genitofemoral nerve divides into which two branches?

Answer 15

the genital and femoral branches

Question 16

What does the Genitofemoral nerve pass through before branching off?

Answer 16

the psoas major

Question 17

Which Genitofemoral branch passes through the inguinal ligament?

Answer 17

Genital branch

Question 18

what muscle does the genital branch supply?

Answer 18

Cremaster muscle

Question 19

What is the sensory function of the genital branch?

Answer 19

superior anteriro scrotum

skin of the mons pubis and labium magus

Question 20

What does the femoral branch supply?

Answer 20

sensory to the skin of the anterior upper thigh

Question 21

How does the femoral branch get into the posterior thigh?

Answer 21

passes through the posterior to inguinal ligament

Question 22

Which nerve contains fibers from L2 and L3?

Answer 22

Lateral cutaneous Nerve of the Thigh

Question 23

What does the lateral cutaneous nerve of the thigh supply?

Answer 23

sensory to the skin on the lateral thigh and superior knee

Question 24

How does the lateral cutaneous nerve of the thigh leave the body cavity?

Answer 24

it passes under the inguinal ligament

Question 25

What is the largest nerve of the lumbar plexus?

Answer 25

the femoral nerve

Question 26

What nerve fibers does the femoral nerve contain?

Answer 26

L2, L3, L4

Question 27

Other than the femoral nerve, what other nerve contains nerve fibers L2, L3, L4?

Answer 27

the obturator nerve

Question 28

What artery does the femoral nerve supply?

Answer 28

the femoral artery

Question 29

In the abdomen, what does the femoral nerve supply?

Answer 29

iliacus and pectineus

Question 30

After passing posterior to the inguinal ligament, the femoral nerve divides into which two divisions?

Answer 30

anterior and posterior division

Question 31

What three nerves does the anterior divisions of the femoral nerve give rise to?

Answer 31

Intermediate cutaneous Nerve of the thigh Medial cutaneous nerve of the thigh nerve to the sartorius

Question 32

What does the intermediate nerve of the thigh supply?

Answer 32

sensory to the skin on the anterior thigh down to the knee

Question 33

What nerve does the intermediate nerve of the thigh communicate with?

Answer 33

genitofemoral nerve

Question 34

How does the intermediate nerve of the thigh communicate with the genitofemoral nerve?

Answer 34

the lateral branch of the intermediate nerve of the thigh

Question 35

Where does the medial cutaneous nerve of the thigh cross in relationship to the femoral artery?

Answer 35

anterior

Question 36

What does the medial cutaneous nerve of the thigh supply?

Answer 36

sensory to the skin other the medial thigh, medial one, and knee across the lateral side of the patella

Question 37

The medial cutaneous nerve of the thigh supplies sensory for the skin of the medial leg through communication of what other nerve?

Answer 37

saphenous nerve

Question 38

What muscle does the sartorius supply?

Answer 38

the sartorius muscle

Question 39

What do the muscular branches of the posterior division of the femoral nerve supply?

Answer 39

``` sartorius, rectus femorus, vastus lateralis vastus medialis vastus intermedius ```

Question 40

what do the vascular branches of the posterior division of the femoral nerve supply?

Answer 40

the femoral artery and its branches

Question 41

After the knee joint, what happens to the posterior division of the femoral nerve?

Answer 41

it branches and continues as the saphenous nerve

Question 42

Where does the posterior division of the femoral nerve branch before continuing as the saphenous nerve?

Answer 42

after the adductor canal | `

Question 43

Where does the saphenous nerve lie in relationship to the femoral after?

Answer 43

medial

Question 44

What does the saphenous nerve supply?

Answer 44

sensory to the skin medial and anterior to the patella | and medial leg and foot

Question 45

What does the saphenous nerve travel with in the leg?

Answer 45

the great saphenous vein

Question 46

What are clinical considerations of the femoral nerve?

Answer 46

Patellar reflex and sensory deficits

Question 47

What is the principle contributor to the obturator nerve?

Answer 47

L3; L2 contribution is minimal

Question 48

The obturator muscle travels medial to what muscle and posterior to which vein

Answer 48

psoas major; common iliac vein

Question 49

after descending through the pelvis, what dos the obturator muscle travel along?

Answer 49

obturator internus

Question 50

How does the obturator nerve leave the pelvis?

Answer 50

obturator foramen

Question 51

After leaving the obturator foramen, the obturator splits into?

Answer 51

anterior and posterior branches

Question 52

What are the anterior and posterior branches separated by?

Answer 52

obturator externus and adductor brevis

Question 53

What does the termination of the anterior branch supply?

Answer 53

femoral artery

Question 54

What forms the sub sartorial plexus?

Answer 54

the anterior branch of the obturator nerve and branches of the femoral nerve

Question 55

What does the sub sartorial plexus supply?

Answer 55

sensory to the skin on the medial thigh

Question 56

What does the articular branches of the anterior branch of the obturator nerve supply?

Answer 56

the hip joint

Question 57

What muscles do the anterior branch of the obturator nerve supply?

Answer 57

obturator externus adductor magnus adductor brevis

Question 58

Fibers from the obturator nerve connect with what other nerves to supply the skin of the upper medial side of the leg?

Answer 58

accessory obturator nerve medial cutaneous nerve of the thigh saphenous nerve

Question 59

What muscles does the posterior branch of the obturator nerve supply?

Answer 59

obturator externus adductor magnus adductor brevis

Question 60

What articular fibers of the posterior branch of the obturator nerve supply?

Answer 60

the knee joint

Question 61

What are clinical considerations of the obturator nerve?

Answer 61

muscular weakness and sensory deficit