Lumbar Plexus Part 2

Question 1

What branch of the lumbar plexus supplies the sartorius muscle?

Answer 1

the nerve to the sartorius of the anterior division of the femoral nerve

Question 2

What nerve has a lateral branch that communicates with the femoral branch of the genitofemoral nerve?

Answer 2

intermediate cutaneous nerve of the thigh

Question 3

What skin is supplied by the intermediate cutaneous nerve of the thigh?

Answer 3

skin on the anterior thigh down to the knee

Question 4

What skin is supplied by the medial cutaneous nerve of the thigh?

Answer 4

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

Question 5

Some branches of the medial cutaneous nerve of the thigh will supply the skin of the medial leg through communications with what nerve?

Answer 5

saphenous nerve

Question 6

What does the posterior division of the femoral nerve continue as after giving off its branches?

Answer 6

the saphenous nerve

Question 7

Before continuing as the saphenous nerve, what types of branches are given off by the posterior division of the femoral nerve?

Answer 7

muscular branches and vascular branches

Question 8

What muscles are supplied by the muscular branches of the posterior division of the femoral nerve given off before it becomes the saphenous nerve?

Answer 8

quadriceps and sartorius (sartorius, rectus femoris, vastus lateralis, vastus medialis, and vastus intermedialis)

Question 9

What major blood vessel is supplied by the vascular branches of the posterior division of the femoral nerve (before it becomes the saphenous nerve)?

Answer 9

femoral artery

Question 10

T/F: the saphenous nerve is transmitted through the adductor canal.

Answer 10

true

Question 11

T/F: the saphenous nerve lies lateral to the femoral artery when they exit the adductor canal.

Answer 11

False; the saphenous nerve crosses the artery in the canal and lies medial to the artery upon exiting.

Question 12

What skin of the thigh is supplied by the saphenous nerve?

Answer 12

the skin medial and anterior to the patella

Question 13

What skin in the leg is supplied by the saphenous nerve?

Answer 13

skin of the medial leg and foot

Question 14

What vessel does the saphenous nerve travel with in the leg?

Answer 14

great saphenous vein

Question 15

What reflex mentioned in class is associated with the femoral nerve?

Answer 15

patellar reflex

Question 16

What levels contribute to the obturator nerve?

Answer 16

L2, L3, and L4 (primarily L3)

Question 17

If the prinicpal contributor to the obturator nerve is L3, what is the minimal contributor?

Answer 17

L2

Question 18

T/F: the obturator nerve travels lateral to the psoas major, posterior to the common iliac vesels and descends into the pelvis, traveling on the obturator externus.

Answer 18

False; travels medial to the psoas major, and travels on the obturator internus not externus.

Question 19

Where does the obturator nerve leave the pelvis?

Answer 19

obturator foramen

Question 20

What does the obturator nerve divide into once it exits the pelvis?

Answer 20

anterior and posterior branches

Question 21

What separates the anterior and posterior branches of the obturator nerve?

Answer 21

initially the obturator externus and then by the adductor brevis (Torgerud said this tends to be an exam question)

Question 22

T/F: the obturator nerve branches anteriorly and posteriorly around the obturator internus.

Answer 22

False; should say obturator externus

Question 23

Which adductor muscle separates the branches of the obturator nerve?

Answer 23

adductor brevis

Question 24

The anterior branch of the obturator nerve passes anterior to the obturator externus and the adductor brevis, what muscles does it pass posterior to?

Answer 24

pectineus and adductor longus

Question 25

The anterior branch of the obturator nerve sends some fibers to communcate with the femoral nerve. What does this form?

Answer 25

the subsartorial plexus

Question 26

What does the subsartorial plexus contribute to the supply of?

Answer 26

skin on the medial thigh

Question 27

What is supplied by the termination of the anterior branch of the obturator nerve?

Answer 27

femoral artery

Question 28

Where does the anterior branch of the obturator nerve send articular branches?

Answer 28

the hip joint

Question 29

What four muscles are supplied by the anterior branch of the obturator nerve?

Answer 29

(AGAP between the legs) Adductor longus, Gracillis, Adductor brevis (usually), and Pectineus (usually)

Question 30

What nerve (if present) will the anterior branch (maybe) send fibers to connect with?

Answer 30

accessory obturator nerve

Question 31

If the anterior branch of the obtruator nerve sends fibers to communicate with the medial cutaneous nerve of the thigh and the saphenous nerve, what skin will the obturator nerve then help contribute to?

Answer 31

the skin on the upper medial side of the leg

Question 32

T/F: the posterior branch of the obturator nerve travels through the obturator internus, posterior to the adductor brevis, and anterior to the adductor magnus.

Answer 32

False; travels through the obturator externus NOT internus

Question 33

What muscles are supplied by the posterior division of the obturator nerve?

Answer 33

obturator externus, adductor magnus and the adductor brevis (if not supplied by the anterior branch)

Question 34

Where does the posterior branch of the obturator nerve send articular fibers?

Answer 34

knee joint

Question 35

How would one test muscular weakness of the muscles supplied by the obturator nerve?

Answer 35

have patient adduct leg against resistance and rate strength on a scale of 0-4 (0 being no strength 4 being very strong)