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OS 203 MSK > Lumbosacral Plexus > Flashcards

Lumbosacral Plexus Flashcards

1
Q

Largest nerve of the body

A

sciatic nerve

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2
Q

roots of sciatic nerve

A

L4, L5, S1, S2, S3

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3
Q

sciatic nerve innervates what muscles

A 
Posterior thigh muscles:
Innervated by tibial nerve:
Long head of Biceps femoris
Semimembranosus
Semitendinosus
hamstring portion of adductor magnus

innervated by common fibular nerve
short head of biceps femoris

all leg and foot muscles
skin of most leg and foot
articular branches to all joints of the lower limb

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4
Q

what muscles does sciatic nerve supply in gluteal region

A

sciatic nerve supplies no gluteal muscles

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5
Q

tibial nerve innervates what muscles

A

Superficial component (PSG):
Plantaris - flexes ankle
Soleus - flexes ankle
Gastrocnemius - flexes ankle and knee

Deep compartment (PFFT):
Popliteus - lateral rotation of femur on tibia to unlock knee
Flexor Hallucis Longus - flexes big toe and ankle flexion
Flexor digitorum longus - flexes other digits
tibialis posterior - inverts foot and flexes ankle

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6
Q

tibial nerve supplies foot soles via what branches

A

Medial calcaneal branch - supplies skin of heel
Medial plantar nerve - supplies medial 3 1/2 digits
Lateral plantar nerve - innervates lateral 1 1/2 digits

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7
Q

tibial nerve damage results in what symptoms

A

Loss of:
plantar flexion
flexion of toes
weakened inversion

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8
Q

variations of sciatic nerve

A

common fibular nerve pierces piriformis
common fibular nerve goes superior to piriformis
tibial and cfn both emerge from inferior part of piriformis

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9
Q

sciatic nerve derivatives

A

tibular nerve and common fibular nerve

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10
Q

common fibular nerve innervates what muscles

A

short head of biceps femoris

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11
Q

cfn branches into what nerves (terminal branches)

A

superficial fibular nerve

deep fibular nerve

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12
Q

superficial fibular nerve innervation

A

innervates:
fibularis longus
fibularis brevis
(both to evert foot)

skin of anterolateral leg and dorsum of foot

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13
Q

deep fibular nerve innervation

A

innervates:
tibialis anterior - dorsiflex and invert foot
extensor digitorum longus - extend digits
extensor hallucis longus - extend big toe

skin between first and second toe

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14
Q

cutaneous branches of cfn

A

sural communicating nerve

lateral sural cutaneous nerve

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15
Q

lateral sural communicating nerve innervation

A

skin over upper lateral leg

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16
Q

sural nerve innervation

A

skin over lower posterolateral leg

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17
Q

sural communicating nerve + tibial nerve

A

sural nerve

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18
Q

Fibular nerve damage leads to

A

Fibular Nerve Injury and foot drop

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19
Q

Iliohypogastric nerve innervation

A

skin of anterior part of abdominal wall

20
Q

ilioinguinal nerve innervation

A

skin of groin, scrotum / labius majorus

abdominal muscles and skin of inguinal and pubic regions

21
Q

what is palpated in ilioinguinal nerve block

A

anterior superior iliac spine (ASIS) - 2cm medial and 2 cm superior from ASIS

22
Q

does ilioinguinal nerve provide visceral anesthesia?

A

no

23
Q

genitofemoral nerve branches into?

A

genital branch

femoral branch

24
Q

femoral branch innervation

A

skin of lateral femoral triangle (upper anterior thigh)

25
Q

genital branch innervation

A

sensory fxn:
skin of anterior scrotum
skin over mons pubis and labia majora

motor fxn:
cremastic muscle

26
Q

lateral femoral cutaneous nerve innervation

A

skin of anterolateral surface of thigh

27
Q

nerves with no motor function

A

lateral femoral cutaneous nerve

posterior femoral cutaneous nerve

28
Q

nerves with no sensory fxn

A

superior gluteal nerve

29
Q

femoral nerve innervation

A

innervates iliacus

flexors of hip and extensors of knee

30
Q

femoral nerve block location

A

2cm inferior of inguinal ligament (attached to ASIS)

31
Q

obturator nerve branches into

A

anterior and posterior branches

32
Q

obturator nerve (anterior branch) innervation

A 
motor fibers to:
adductor longus
adductor brevis
gracilis
pectineus muscles (rare cases)
33
Q

posterior branch of obturator innervation

A

obturator externus and adductor magnus

34
Q

cutaneous branch of obturator innervation

A

skin in middle of medial part of the thigh

35
Q

obturator nerve damage symptoms

A

numbness and paraesthesis on medial aspect of thigh

weakness in thigh adduction

36
Q

What nerves constitutes lumbar plexus

A 
I^2 Got Lunch on Friday Afternoons 
iliohypogastric
ilioinguinal 
genitofemoral
lateral femoral cutaneous thigh 
obturator nerve
femoral nerve
accessory obturator nerve
37
Q

what nerves comprises sacral plexus?

A 
Superior gluteal nerve
Inferior gluteal nerve
Posterior femoral cutaneous nerve
Pudendal nerve
Sciatic nerve
38
Q

superior gluteal nerve innervation

A

primary hip abductors:
gluteus medius
gluteus minimus
tensor fascia latae

39
Q

superior gluteal nerve damage results into

A

tredelenburg gait
weakened abduction of thigh
COG over supporting lower limb

40
Q

inferior gluteal nerve innervation

A

gluteus maximus

41
Q

ign injury leads into

A

gluteus maximus gait

42
Q

posterior femoral cutaneous nerve innervation

A

skin of inferior half of buttocks
skin over posterior thigh and popliteal fossa
skin of lateral perineum and upper medial thigh

43
Q

what nerve supplies more skin than any other cutaneous nerve

A

posterior femoral cutaneous nerve

44
Q

Pudendal nerve innervation

A

motor: perineum muscles
sensory: majority of perineal region via inferior rectal and perineal nerves and dorsal nerve of clitoris or penis

45
Q

pudendal nerve branches into

A

inferior rectal nerve
perineal nerve
dorsal nerve of penis or clitoris

46
Q

perineal nerve innervation

A

muscles of perineum and pelvic floor
bulbospongiosus
ischiocavernosus
Levator ani (puborectalis, pubococcygeus, iliococcygeus)

OS 203 MSK (5 decks)

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