Manual 69-71: Nerves of Thigh Flashcards Preview

Anatomy Lower Limb > Manual 69-71: Nerves of Thigh > Flashcards

Flashcards in Manual 69-71: Nerves of Thigh Deck (43):
1

roots femoral branch of genitofemoral n

L1-2

2

the femoral branch of genitofemoral n passes ______ to the genital branch

lateral

3

the femoral branch of genitofermoral n travels with ...

- external iliac/femoral a deep to the inguinal ligament in the lateral compartment of the femoral sheath
- lays on top of psoas major

4

femoral branch of genitofemoral n supplies...

skin on proximal, anterior surface of thigh

5

roots lateral femoral cutaneous n

L2-3

6

how does the lateral femoral cutaneous n travel

- first appears over lateral border of psoas major
- passes over iliacus toward ASIS and goes under inguinal ligament
- goes over the sartorius m

7

which branch of the lateral femoral cutaneous n supplies skin over lateral and anterior thigh?

- anterior branch
- posterior branch supplies skin of lateral thigh (greater trochanter to mid-thigh)

8

roots obturator n

L2-4

9

how does the obturator n enter the thigh?

- into medial compartment of thigh through obturator canal

10

which branch of the obturator n is more superficial

anterior brnach

11

where is the anterior branch of obturator n located in relation to muscles

- anterior to adductor brevis
- passes over the obturator externus
- deep to pectineus and adductor longus
- superficial to adductor brevis

12

what branches come off the anterior branch of obturator n.?

- communication with accessory obturator if present
- articular branch to hip joint
- muscular branches to adductor longus, gracilis, adductor brevis, rarely pectineus
- cutaneous branches to akin on medial thigh just above knee

13

where is the posterior branch of obturator n located in relation to muscles

- posterior to adductor brevis
- anterior to adductor magnus

14

which branch of the obturator n give an articular branch to knee joint

posterior/deep branch
- anterior gives branch to hip joint

15

which m does the posterior branch of obturator n supplly

- obturator externus (goes through it)
- adductor magnus
- adductor brevis sometimes

16

how often is the accessory obturator n present

10%

17

roots accessory obturator

L3-4

18

what does the accesssory obturator supply if present

- passes deep to pectineus and supplys muscular branches to it
- articular branch to hip joint

19

roots femoral n.

L2-4

20

is the femoral n in the femoral sheath

NO
- passes under inguinal ligament lateral to femoral a and lies OUtSIDE the femoral sheath

21

immediately after entering the thigh the femoral n divides into...

cutaneous and muscular branches

22

the anterior femoral cutaneous off of the femoral n divides into..

medial femoral cutaneous = skin of medial thigh distally to leg
intermediate femoral cutaneous branch = skin of anteiror thigh

23

what m are supplied by femoral n.

all muscles of anterior compartment (sartorius, quadratus femorus, articularis genu)
sometimes pectineus

24

longest branch of femoral n

saphenous n

25

how does the femoral n travel

- enters adductor canal with femoral a
- crosses lateral to medial in canal over the a
- leaves canal and passes to medial side of knee

26

does the femoral n pass through the adductor hiatus

NO
passes between tendons of sartorius and gracilis musclesa and runs down leg with great saphenous v

27

at the proximal 1/3 of the leg the saphenous n divides into

- subsartorial n plexus contribution
- infrapatellar branch (cutaneous innervation to skin over patella)

28

at the distal 1/3 of leg the saphenous n divides into terminal branches which ...

supply skin at anterior and medial side of leg and foot as far as the ball of the foot

29

what forms the subsartorial n plexus

- communications from anterior branch of obturator, spahenous n, and medial femoral cutaneous n

30

where is the subsartorial n plexus located

- inferior margin of adductor longus
- deep to sartorius m

31

largest branch of sacral plexus

sciatic n
also the largest n in body

32

roots sciatic n

L4-S3
(anterior division of all, posterior divisions up to S2)

33

what does the sciatic n supply

- posterior compartment muscles
- ALL muscles of leg and foot
- skin of foot
- most of the skin of leg
- ALL joints of lower extremity

34

how many nerves comprise the sciatic n

anatomically one nerve, physiologically two nerves wrapped together in single connective tissue sheath
- both nerves have separate origins from sacral plexus. fibers do not mix while traveling together

35

when does the sciatic n split into tibial and common peroneal n

split as passes into distal 1/3 of posterior thigh (emerging from beneath long head of biceps femoris)

36

roots tibial n

anterior division L4-S3

37

roots common peoneal n

posterior divisions L4-S2

38

before it splits the sciatic n gives off what branches

- articular branches to hip joint
- muscular branches to hamstrings (tibial- all posterior compartment m of thigh - and common peroenal portion - short head biceps femoris)

39

the posterior compartment muscles of thigh are supplied by what?

tibial portion of sciatic n EXCEPT for the short head of biceps femoris which is innervated by common peroneal poriton

40

if the sciatic n divides early, which part leaves pelvis inferior to piriformis

tibial n
common peroneal n will pierce piriformis

41

the posterior cutaneous n may arise in two parts ...

- ventral part accompanying the tibial n and giving rise to peroneal n and medial cutaneous n
- dorsal branch passing through piriformis with common peroneal n giving a gluteal branch and femoral branch

42

what n might peirce sacrotuberous ligament

inferior pudendal branch

43

how often is the perforating cutaneous n missing

1/3 to 1/2 bodies
- may arise in common with pudendal n