Exam 3: Lumbar Plexus

Question 1

Lumbar plexus formed by

Answer 1

Anterior primary rami of L1-3, part of L4, part of T12

Question 2

Muscular branches from anterior rami supply

Answer 2

Quadratus lumborum
Psoas major
Psoas minor

Question 3

Muscular branch of L1 supplies

Answer 3

Quadratus lumborum

Psoas minor

Question 4

Muscular branch of L2 supplies

Answer 4

Quadratus lumborum

Both psoas

Question 5

L3 and L4 muscular branches supply

Answer 5

Quadratus lumborum

Psoas major

Question 6

Iliohypogastric N contains fibers from

Answer 6

T12 and L1

Question 7

Iliohypogastric N travels ant/inf between

Answer 7

Quadratus lumborum and kidney

Question 8

Iliohypogastric N travels through ____ and travels between it and ___

Answer 8

Transverse abdominal muscle; internal oblique

Question 9

Iliohypogastric gives off a ____ which supplies the posteriorlateral gluteal region

Answer 9

Lateral cutaneous branch

Question 10

Iliohypogastric N continues as ___ which supplies skin of pubic region

Answer 10

Anterior cutaneous branch

Question 11

Iliohypogastric N supplies these muscles

Answer 11

Internal oblique

Transverse abdominal

Question 12

Ilioinguinal N contains fibers from

Answer 12

T12 and L1

Question 13

Ilioinguinal N is transmitted through ___ and travels w/ ___

Answer 13

Inguinal canal; spermatic cord (round lig)

Question 14

Ilioinguinal N supplies these muscles

Answer 14

Internal oblique

Transverse abdominal

Question 15

Genitofemoral N contains fibers from

Answer 15

L1 and L2

Question 16

Genitofemoral N passes anteriorward through ___ and divides into ___

Answer 16

Psoas major

Genital and femoral branches

Question 17

Genital branch enters and travels through

Answer 17

Inguinal canal

Question 18

After leaving canal genital branch provides motor supply to ___ and sensory to ___

Answer 18

Cremaster

Skin of sup/ant scrotum - males
Skin of mons pubis/labia majus - females

Question 19

Femoral branch of genitofemoral passes into the thigh ___ to inguinal lig

Answer 19

Posterior

Question 20

Femoral branch of genitofemoral supplies

Answer 20

Skin of upper anterior thigh

Question 21

Lateral cutaneous N of thigh contains fibers from

Answer 21

L2 and L3

Question 22

Lateral cutaneous N of thigh supply

Answer 22

Skin of lateral thigh (superior to knee)

Question 23

Lateral cutaneous N of thigh leave ab cavity by passing _____, travels anterior to ___ and through ____

Answer 23

Under inguinal lig; sartorius; fascia lata

Question 24

Largest branch in lumbar plexus ____ contains fibers from _____

Answer 24

Femoral N

L2, 3, 4

Question 25

Femoral N forms posterior to ___ and emerges lateral to ___/anterior to ___

Answer 25

Psoas major; psoas; iliacus

Question 26

Femoral N passes posterior to inguinal lig and enters femoral triangle lateral to

Answer 26

Femoral artery

Question 27

Femoral N runs inferior/medial through ___ and into leg, ___ to knee

Answer 27

Adductor canal; medial

Question 28

W/in abdomen, femoral N gives off muscular branches to

Answer 28

Iliacus and pectineus Also some to femoral artery

Question 29

Beyond the inguinal lig, femoral N divides into

Answer 29

Anterior and posterior division

Question 30

Anterior division of femoral N gives rise to 3 nerves:

Answer 30

Intermediate cutaneous N of thigh Medial cutaneous N of thigh Nerve to sartorius

Question 31

Intermediate cutaneous N of thigh supplies skin on

Answer 31

Anterior thigh down to knee

Question 32

Medial cutaneous N of thigh crosses ___ to femoral artery

Answer 32

Anterior

Question 33

Medial cutaneous N of thigh supply

Answer 33

Skin of medial thigh, medial knee, knee across to lateral patella

Question 34

Nerve to sartorius supplies

Answer 34

Sartorius

Question 35

Posterior division of femoral N muscular branches

Answer 35

``` Sartorius Rectus femoris Vastus lateralis Vastus medialis Vastus intermedialis ```

Question 36

Vascular branches of posterior division of femoral N supply

Answer 36

Femoral artery and its branches

Question 37

Femoral N continues into leg as

Answer 37

Saphenous N

Question 38

Saphenous N is transmitted through

Answer 38

Adductor canal

Question 39

Saphenous N in the adductor canal crosses the ____ so that the N lies ___ to the artery

Answer 39

Femoral artery; medial

Question 40

Saphenous N supplies the skin

Answer 40

Medial and anterior to patella

Question 41

In the leg, the saphenous N travels w/ the ____ and supplies ____

Answer 41

Great saphenous vein; skin of medial leg/foot

Question 42

Obturator N contains fibers from

Answer 42

L2, 3, 4

Question 43

Principal contributor to obturator N

Answer 43

L3

Question 44

Obturator N travels medial to ___, posterior to ___ and descends into pelvis on the ____

Answer 44

Psoas major; common iliac vessels; obturator internus

Question 45

Obturator N leaves pelvis through

Answer 45

Obturator foramen

Question 46

After leaving obturator foramen obturator N splits into

Answer 46

Anterior and posterior branches

Question 47

Anterior and posterior branches of obturator N separated initially by

Answer 47

Obturator externus then by adductor brevis

Question 48

Anterior branch of obturator N travels anterior to

Answer 48

Obturator externus and adductor brevis

Question 49

Anterior branch of obturator N travels posterior to

Answer 49

Pectineus and adductor longus

Question 50

Anterior branch of obturator N sends some branches to femoral N forming the

Answer 50

Subsartorial plexus

Question 51

Subsartorial plexus contributes to supply of

Answer 51

Skin on medial thigh

Question 52

Anterior branch of obturator N sends articular branches to

Answer 52

Hip joint

Question 53

Anterior branch of obturator N sends muscular branches to

Answer 53

Adductor longus Gracilis Pectineus Adductor brevis

Question 54

Anterior branch of obturator N may send fibers to connect w/

Answer 54

Accessory obturator N

Question 55

Anterior branch of obturator N may send fibers to communicate w/

Answer 55

Medial cutaneous N of thigh | Saphenous N

Question 56

Posterior branch of obturator N travels through

Answer 56

Obturator externus

Question 57

Posterior branch of obturator N travels posterior to ____ and anterior to ____

Answer 57

Adductor brevis; adductor magnus

Question 58

Posterior branch of obturator N sends muscular branches to

Answer 58

Obturator externus | Adductor magnus

Question 59

Posterior branch of obturator N will supply this muscle if the anterior branch doesn’t

Answer 59

Adductor brevis

Question 60

Posterior branch of obturator N sends articular fibers to

Answer 60

Knee