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Flashcards in Lumbar Plexus Part 1 Deck (34)
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1

The lumbar plexus is formed by the anterior primary rami of what cord levels?

L1-L3 and part of L4 with contribution from T12 via a communication with L1

2

What muscles are supplied by the muscular branches from the anterior rami of the lumbar plexus?

quadratus lumborum, psoas major, and psoas minor (if present)

3

What levels supply the quadratus lumborum?

L1-L4

4

Which levels supply the psoas major?

L2-L4

5

Which levels supply the psoas minor?

L1 and L2

6

What levels contribute to the iliohypogastic nerve?

T12 and L1

7

What are the main branches of the Lumbar plexus? (6)

Iliohypogastric, Ilioinguinal, Genitofermoral, Lateral Cutaneous of the thigh, Femoral, and Obturator (Irate Indian Girls...)

8

Which branch of the lumbar plexus travels between the quadratus lumborum and the kidney then through the transverse abdominal muscle?

Iliohypogastric nerve

9

After traveling through the transverse abdominal muscle and then between it and the internal abdominal oblique, what branch does the iliohypogastric nerve give off?

lateral cutaneous branch

10

What does the lateral cutaneous branch supply?

the posterolateral gluteal region

11

After giving off the lateral cutaneous branch what does the iliohypogastric nerve continue as and what does it supply?

anterior cutaneous branch which supplies the skin of the pubic region

12

What two muscles does the iliohypogastric nerve supply?

internal abdominal oblique and transverse abdominal

13

What levels contribute to the ilioinguinal nerve?

T12 and L1

14

What strucuture does the ilioinguinal nerve travel through before meeting up with the spermatic cord/round ligament?

inguinal canal

15

What area does the ilioinguinal nerve supply sensory innervation to in both sexes? in males? in females?

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

16

What muscles are supplied by the ilioinguinal nerve?

internal abdominal oblique and transverse abdominal

17

What levels contribute to the genitofemoral nerve?

L1 and L2

18

What muscle does the genitofemoral nerve pass through before dividing into the genital and femoral branches?

psoas major

19

Which branch of the genitofemoral nerve passes throught the inguinal canal?

genital branch

20

What does the genital branch of the genitofemoral nerve supply motor info to? sensory?

motor supply to the cremaster muscle;
sensory to skin of the superior anterior scrotum;
sensory to the mons pubis and labium majus

21

What reflex is triggered by stimulating skin of the medial thigh resulting in the ipsilateral testical rising?

cremasteric reflex (tests the genital branch of the genitofemoral nerve)

22

how does the femoral branch of the genitofemoral branch reach its destination? what does it supply?

passes into the thigh posterior to the inguinal ligament;
supplies skin of the upper anterior thigh

23

What levels contribute to the lateral cutaneous nerve of the thigh?

L2 and L3

24

T/F: the lateral cutaneous nerve supplies some motor innervation.

False;l it is purely sensitive.

25

What does the lateral cutaneous nerve of the thigh supply sensory info to?

lateral thigh, superior to the knee

26

Describe the path of the lateral cutaneous nerve of the thigh.

leaves the abdominal cavity by passing under the inguinal ligament, travels anterior to the sartorius and through the fascia lata to reach the skin

27

What is the largest branch of the lumbar plexus? What levels contribute to this nerve?

femoral nerve;
L2, L3, and L4

28

What muscle does the femoral nerve form behind and then emerge lateral to?

psoas major

29

After passing behind the inguinal ligament, what structure does the femoral nerve enter just lateral to the femoral artery?

femoral triangle

30

After leaving the femoral triangle, the femoral nerve travels inferiorly and medially into what structure before reaching the medial aspect of the leg?

adductor canal