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ANAT315 post midterm > the lumbosacral plexus > Flashcards

the lumbosacral plexus Flashcards

1
Q

what rami of spinal nerves forms the lumbosacral plexus?

A

the anterior rami of spinal nerves

L1-S4

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2
Q

What spinal levels compose the lumbar plexus?

A

L1-L4

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3
Q

What spinal levels compose the Sacral plexus?

A

L5-S4

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4
Q

which plexus is responsible for the cutaneous innervation of the anterior and medial thigh, anterior knee and medial leg and foot?

A

lumbar plexus

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5
Q

which plexus is responsible for the cutaneous innervation to the lower buttocks, posterior thigh, lateral and posterior leg and the majority of the foot?

A

sacral plexus

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6
Q

which plexus is responsible for the motor innervation to the gluteal region, posterior thigh, compartments of the leg and foot?

A

sacral plexus

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7
Q

which plexus is responsible for the motor innervation to anterior and medial compartments of the thigh

A

lumbar plexus

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8
Q

what spinal levels compose the lumbosacral trunk?

A

L4-L5

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9
Q

What is nerve formed by the junction of the L4-L5 junction?

A

lumbosacral trunk

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10
Q

what nerve(s) are responsible for the motor innervation to the lower internal obliques and transversis abdominis muscles?

A

iliohypogastric nerve

ilioinguinal nerve

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11
Q

what is the cutaneous innervation of the iliohypogastric nerve?

A

lateral gluteal region

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12
Q

what si the cutaneous innervation of the ilioinguinal Nerve?

A

upper medial thigh and scrotal/labial branches

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13
Q

what nerve pierces through the obliques and travels superior to the inguinal ligament?

A

iliohypogastic N.

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14
Q

what nerve of the lumbar plexus is associated with T12-L1 spinal levels?

A

iliohypogastic N.

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15
Q

where is the ilioinguinal nerve located?

A

it peak between quadratus lumbarus and psoas major, passes along the iliac crest into the abdominal wall and through the inguinal canal

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16
Q

what is the fascial canal acting as a conduit between the internal and external pelvis?

A

inguinal canal

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17
Q

what nerve of the lumbar plexusis associated with L1 spinal level?

A

ilioinguinal N.

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18
Q

what nerve of the lumbar plexus pierces through the psoas major muscle?

A

genitofemoral

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19
Q

which branch of the genitofemoral N. innervates both sensory and motor?

A

genital branch

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20
Q

what region does the femoral branch of the genitofemoral N. innervate

A

lateral-central innervation of the superior thigh

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21
Q

what muscle gets innervated by the genital branch of the genitofemoral N?

A

cremaster muscle

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22
Q

what gets tested during the cremaster reflex?

A

by touching the region of skin innervated by the genital branch it may stimulate motor innervation and we will see the testes move

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23
Q

what region is cutaneously innervated by the gential branch?

A

medial thigh, shares the same innervation as ilioinguinal N.

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24
Q

what is the nerve responsible for the cutanoeus innervation of the lateral thigh?

A

lateral femoral cutaneous N.

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25
Q

what spinal levels are associated with the Lateral femoral cutanoeus N?

A

L2-L3

26
Q

what nerve of the lumbar plexus is associated with L1-L2 spinal levels?

A

genitofemoral N.

27
Q

what nerve is responsible for the motor innervation of the medial compartments of the thigh (Adductors) and obturator externus?

A

obturator N.

28
Q

what spinal levels are associated to obturator N,

A

L2-L4

29
Q

what region of the thigh is cutanoeusly innervated by obturator N.?

A

medial thigh

30
Q

what nerve splits into branches after passing through the inguinal ligament?

A

femoral N.

31
Q

what spinal levels correspond to the femoral nerve?

A

L2-L4 (like obturator)

32
Q

what is the motor innervation of the femoral nerve?

A

anterior compartment of the thigh (hip flexors, knee extensors)

33
Q

what are the 2 cutaneous branches that originate from the femoral N.?

A

anterior femoral cutanoeus N.

saphenous N.

34
Q

what does the saphenous N. innervate?

A

sensory innervation of the medial leg and foot

35
Q

where does the saphenous N. travel, and along what?

A

it travels down the medial leg along with the greater saphenous vein.

36
Q

what nerves make up the lumbar plexus?

A 
iliohypogastic N.
ilioinguinal N.
Genitofemoral N.
Lateral femoral cutanoeus N.
Obturator N.
femoral N. 
Lumbosacral trunk
37
Q

what does the superior gluteal nerve innervate?

A

gluteus medius and minimum, tensor fascia lata

38
Q

what muscle is an important landmark for inferior/superior gluteal N.

A

piriformis

39
Q

what spinal levels are asssociated with the superior gluteal N.?

A

L4-S1

40
Q

what spinal levels are asssociated with tinferiorgluteal N.?

A

L5-S2

41
Q

what muscle is innervated by the inferior gluteal N?

A

gluteus maximus

42
Q

are the superior and missle cluneal N. part of the lumbosacral plexus? why?

A

no, because they are from the posterior rami of spinal nerves, where as the lumbosacral plexus is composed of the anterior rami of spinal nerves

43
Q

inferior cluneal N. is a branch of which nerve?

A

posterior femoral Cutaneous

44
Q

what nerves sits medially to sciatic nerve?

A

posterior femoral cutaneous n.

45
Q

what spinal level corresponds to the sciatic N?

A

L4-S3

46
Q

what nerve corresponds to the following spinal level S1-S3

A

posterior femoral cutaneous N.

47
Q

what region is innervated by the posterior femoral cutaneous n?

A

the posterior thigh

48
Q

what nerve has a tortuous course but goes through genitalia and controls anal sphincters?

A

pudenal N.

49
Q

what spinal levels correspond to the pudendal n?

A

S2-S4

50
Q

what does the sciatic nerve innervate?

A

posterior compartment of the thigh and its branches will innervate leg and foot

51
Q

what are the 2 branches that originate from the sciatic N?

A

tibial N

Common fibular N.

52
Q

what branch of the sciatic N. runs along the lateral side of the leg?

A

common fibular n.

53
Q

what branch of the sciatic N. runs along the back of the leg?

A

tibial N.

54
Q

what cutaneous branch originates from the tibial N.

A

medial Sural Cutaneous N

55
Q

what spinal levels correspond to the tibial N.

A

L5-S3

56
Q

what spinal levels correspond to the common fibular N?

A

L4-S2

57
Q

what cutaneous branch originates from the common fibular N.

A

Lateral Sural cutaneous N.

58
Q

how id the sural N. formed?

A

the medial and lateral Sural cutaneous branches merge together in the leg

59
Q

what does the sural nerve innervate

A

sensory innervation of the posterior and lateral leg and lateral foot

60
Q

what does the MSC N. innervate?

A

sensory innervation of the middle compartment of the upper posterior leg

61
Q

what does the LSC N. innervate?

A

Lateral knee and lateral side of the upper leg

ANAT315 post midterm (10 decks)

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