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APMLE LEA > Manual 69-71: Nerves of Thigh > Flashcards

Manual 69-71: Nerves of Thigh Flashcards

1
Q

roots femoral branch of genitofemoral n

A

L1-2

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2
Q

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

A

lateral

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3
Q

the femoral branch of genitofermoral n travels with …

A
  • external iliac/femoral a deep to the inguinal ligament in the lateral compartment of the femoral sheath
  • lays on top of psoas major
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4
Q

femoral branch of genitofemoral n supplies…

A

skin on proximal, anterior surface of thigh

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5
Q

roots lateral femoral cutaneous n

A

L2-3

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6
Q

how does the lateral femoral cutaneous n travel

A
  • first appears over lateral border of psoas major
  • passes over iliacus toward ASIS and goes under inguinal ligament
  • goes over the sartorius m
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7
Q

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

A
  • anterior branch

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

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8
Q

roots obturator n

A

L2-4

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9
Q

how does the obturator n enter the thigh?

A
  • into medial compartment of thigh through obturator canal
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10
Q

which branch of the obturator n is more superficial

A

anterior brnach

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11
Q

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

A
  • anterior to adductor brevis
  • passes over the obturator externus
  • deep to pectineus and adductor longus
  • superficial to adductor brevis
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12
Q

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

A
  • 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
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13
Q

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

A
  • posterior to adductor brevis

- anterior to adductor magnus

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14
Q

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

A

posterior/deep branch

- anterior gives branch to hip joint

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15
Q

which m does the posterior branch of obturator n supplly

A
  • obturator externus (goes through it)
  • adductor magnus
  • adductor brevis sometimes
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16
Q

how often is the accessory obturator n present

A

10%

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17
Q

roots accessory obturator

A

L3-4

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18
Q

what does the accesssory obturator supply if present

A
  • passes deep to pectineus and supplys muscular branches to it
  • articular branch to hip joint
19
Q

roots femoral n.

A

L2-4

20
Q

is the femoral n in the femoral sheath

A

NO

- passes under inguinal ligament lateral to femoral a and lies OUtSIDE the femoral sheath

21
Q

immediately after entering the thigh the femoral n divides into…

A

cutaneous and muscular branches

22
Q

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

A

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

23
Q

what m are supplied by femoral n.

A

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

24
Q

longest branch of femoral n

A

saphenous n

25
Q

how does the saphenous n travel

A
  • 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
Q

does the saphenous n pass through the adductor hiatus

A

NO

passes between tendons of sartorius and gracilis musclesa and runs down leg with great saphenous v

27
Q

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

A
  • subsartorial n plexus contribution

- infrapatellar branch (cutaneous innervation to skin over patella)

28
Q

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

A

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

29
Q

what forms the subsartorial n plexus

A
  • communications from anterior branch of obturator, spahenous n, and medial femoral cutaneous n
30
Q

where is the subsartorial n plexus located

A
  • inferior margin of adductor longus

- deep to sartorius m

31
Q

largest branch of sacral plexus

A

sciatic n

also the largest n in body

32
Q

roots sciatic n

A

L4-S3

anterior division of all, posterior divisions up to S2

33
Q

what does the sciatic n supply

A
  • posterior compartment muscles
  • ALL muscles of leg and foot
  • skin of foot
  • most of the skin of leg
  • ALL joints of lower extremity
34
Q

how many nerves comprise the sciatic n

A

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
Q

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

A

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

36
Q

roots tibial n

A

anterior division L4-S3

37
Q

roots common peoneal n

A

posterior divisions L4-S2

38
Q

before it splits the sciatic n gives off what branches

A
  • 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
Q

the posterior compartment muscles of thigh are supplied by what?

A

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

40
Q

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

A

tibial n

common peroneal n will pierce piriformis

41
Q

the posterior cutaneous n may arise in two parts …

A
  • 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
Q

what n might peirce sacrotuberous ligament

A

inferior pudendal branch

43
Q

how often is the perforating cutaneous n missing

A

1/3 to 1/2 bodies

- may arise in common with pudendal n

APMLE LEA (23 decks)

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