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MGA Exam 3 > The Lumbosacral Plexus > Flashcards

The Lumbosacral Plexus Flashcards

1
Q

Lumbar plexus consists of

A

T12-L4

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2
Q

Sacral plexus consists of

A

L4-S4

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3
Q

Coccygeal plexus consists of

A

S4- Co1

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4
Q

Subcostal nerve is

A

T12

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5
Q

T12 includes cutaneous branches that supply

A

supply sensory innervation to anterior and lateral body wall and skin over hip

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6
Q

The cutaneous domain of T12 overlaps with

A

Iliohypogastic nerve

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7
Q

T12 innervates

A

Rectus abdominis

Pyramidalis

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8
Q

Iliohypogastic nerve is

A

T12-L1

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9
Q

Iliohypogastic nerve is closely related to

A

Ilioinguinal nerve

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10
Q

Iliohypogastic nerve provides sensory innervation to

A

Inguinal region and superiormost lateral thigh

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11
Q

Cutaneous domain of the iliohypogastic nerve overlaps with

A

Subcostal nerve

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12
Q

Iliohypogastic nerve innervates

A

Oblique muscles

Transversus abdominis

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13
Q

Ilioinguinal nerve is

A

T12-L1

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14
Q

Ilioinguinal nerve provides sensory innervation to

A

superiormost inner thigh, root of penis and upper scrotal skin (male)

mons pubis and labia majora (female)

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15
Q

Ilioinguinal nerve innervates

A

Internal oblique muscle

Transversus abdominis muscle

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16
Q

What are the main four nerves of the lumbosacral plexus

A

Femoral

Obturator

Tibial

Common fibular

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17
Q

Genitofemoral nerve consits of

A

L1-L2

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18
Q

Femoral branch of genitofemoral nerve exits

A

Pelvis though lacuna vasorum

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19
Q

Femoral branch of genitofemoral provides ___ innervation to ___

A

Sensory innervation ot upper part of femoral triangle

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20
Q

Genital branch of genitofemoral nerve travels through

A

Superficial inguinal ring with spermatic cord

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21
Q

Genital branch of genitofemoral nerve supplies ___ innervation to ___

A

Sensory innervation to lower scrotal skin

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22
Q

Genital branch of genitofemoral nerve innervates ___ in males

A

Innervates cremaster muscle in males

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23
Q

Genital branch of genitofemoral nerve ends in ___

A

Mons pubis

Labia majora in females

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24
Q

Lateral femoral cutaneous nerve consists of

A

L2-L3

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25
Q

Lateral femoral cutaneous exits ___ through ___

A

Exits pelvis at ASIS through the lacuna musculorum

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26
Q

Lateral femoral cutaneous supplies ___ innervation to ___

A

Sensory innervation to skin of lateral thigh

Has NO motor innervation

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27
Q

Obturator consists of

A

L2-L4

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28
Q

Obturator exits __ through__

A

Exits pelvis through obturator canal

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29
Q

Obutrator innervates ___

A

Adductor muscles of the thigh

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30
Q

Femoral nerve consists of

A

L2-L4

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31
Q

Anterior division of the femoral nerve supplies ___ innervation to ___

A

Sensory innervation to anterior thigh

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32
Q

Femoral nerve- anterior division innervates

A

Pectineus

Sartorius

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33
Q

Femoral nerve posterior division is also called

A

Saphenous nerve

34
Q

Posterior division of femoral nerve (Saphenous nerve) supplies ___ innervation to __

A

Sensory innervation to anterior leg

35
Q

Posterior division of femoral nerve (saphenous nerve) innervates

A

Quadriceps muscle

36
Q

Superior gluteal nerve consists of

A

L4-S1

37
Q

Superior gluteal nerve exits pelvis through

A

Suprapiniform foramen

38
Q

Superior gluteal nerve innervates

A

Gluteus medius

Gluetus minimis

Tensor fasciae latae

39
Q

Inferior gluteal nerve consits of

A

L5-S2

40
Q

Inferior gluteal nerve exits pelvis through

A

Infrapiniform foramen

41
Q

Inferior gluteal nerve innervates

A

Gluteus maximus

42
Q

Tibial component of siatic nerve consits of

A

L4-S3

43
Q

Tibial component of siatic nerve exits pelvis through

A

Infrapiriform foramen

44
Q

Is the tibial component of the siatic nerve sensory, motor, or both?

A

Both

45
Q

The common fibular component of siatic nerve is

A

L4-S2

46
Q

Common fibular component exits pelvis through

A

Infrapiriform foramen

47
Q

Is the common fibular component of the siatic nerve sensory, motor, or both?

A

Both

48
Q

Posterior femoral cutaneous nerve consists of

A

S1-S3

49
Q

Posterior femoral cutaneous nerve exits pelvis through

A

Infrapiriform foramen

50
Q

Posterior femoral cutaneous nerve supply ___ innervation to ___

A

Sensory innervation to posterior thigh and popliteal fossa

51
Q

Inferior cluneal branch of the posterior femoral cutaneous nerve supplies

A

Inferior buttock

52
Q

Inferior perineal branch of the posterior femoral cutaneous nerve supplies

A

Perineum

53
Q

Is the posterior femoral cutaneous nerve motor, sensory, or both?

A

Neither

54
Q

Pudendal nerve consists of

A

S2-S4

55
Q

How does the pudendal nerve travel?

A

exits pelvis through infrapiriform foramen

Crosses superficial to ischial spine and sacrospinous ligament

Enters ischioanal fossa through lesser sciatic foramen

56
Q

Coccygeal plexus contains

A

S4-S5

57
Q

Anococcygeal nerve contains

A

S4-S5

58
Q

Coccygeal nerve contains

A

S5

59
Q

The ___ divides the greater sciatic foramen into ___ and ___

A

Piriformis muscle into

Suprapiriform foramen and infrapiriform foramen

60
Q

Generally speaking, structures that pass into the perineum or lower extermity can enter or exit the pelvis by 1 of 4 routes:

A

Through the pelvic outlet

Over the rim of the pelvis

Through one of the paired foramina defined by both bone and soft tissue

Through the paired sacral foramina

61
Q

What exits through the pelvic outlet?

A

Digestive, urinary, and most reproductive organs

62
Q

What exits over the rim of the pelvis and inguinal ligament?

A

A few nerves

Spermatic cord

63
Q

What exits through one of the paired foramina?

A

Arteries

Veins

Lymphatics

Most nerves

64
Q

What exits through the paired sacral foramina?

A

Dorsal rami of sacral spinal nerves

Lateral sacral artery branches

65
Q

What nerves exit through the superior rim of the pelvis and inguinal ligament?

A

Subcostal nerve

Iliohypogastic nerve

66
Q

What nerve exits through the lacuna musculorum?

A

Lateral femoral cutaneous nerve

Femoral nerve

67
Q

What nerve exits through the lacuna vasorum?

A

Femoral branch of genitofemoral nerve

68
Q

What nerve exits through the ilioinguinal canal?

A

Ilioinguinal nerve

Genital branch of genitofemoral nerve

69
Q

What nerve exits through the obturator canal?

A

Obturator nerve

70
Q

What nerve exits through the suprapiriform foramen?

A

Superior gluteal nerve

71
Q

What nerves exits through the infrapiriform foramen?

A

Inferior gluteal nerve

Sciatic nerve

Posterior femoral cutaneous nerve

Pudendal nerve

72
Q

What nerve enters through the lesser sciatic foramen?

A

Pudendal nerve (entering perineum)

73
Q

What big nerves are cranial and part of the lumbar plexus

A

Femoral nerve (and nerves to the iliacus and psoas)

Obturator nerve

74
Q

What big nerves are part of the sacral plexus?

A

Common fibular nerve (and gluteal nerves)

Tibial nerve (and nerves to lateral rotators

75
Q

Standing upright rotated the femur ___ through __ degrees and the body axis (and pelvis) ___ through __ degrees

A

Femur rotates 90 degrees ventrally

Body axis/pelvis dorsally through 90 degrees

76
Q

Combined result of rotation of femur and pelvis is that

A

Innervation domains come to spiral around the lower extermity

77
Q

Muscles innervated by the obturator nerve are __ which originate from ___

A

Adductor muscles

Originate from pubis

78
Q

Muscles innervated by the femoral nerve are ___ and originate from ___

A

Quads and hip flexor muscles

Originate from anterior and medial surfaces of ilium

79
Q

Muscles innervated by the common fibular and gluteal nerves are ___ which originate from ___

A

Gluteal muscles
Muscles of the anterior and lateral leg
Dorsal foot

Gluteal muscles originate from posterior and lateral surfaces of ilium

80
Q

Muscles innervated by the tibial nerve are ___ which originate from ___

A

Hamstring muscles
Most lateral rotator muscles
Muscles of posterior leg
Plantar foot

Hamstring and lateral rotator muscles originate from ischium

MGA Exam 3 (8 decks)

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