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PNS exam III - mine > Sacral Plexus - Part 1 > Flashcards

Sacral Plexus - Part 1 Flashcards

1
Q

The sacral plexus if formed by what?

A

Anterior primary ram of L4, L5, S1-S3, and part of S4

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2
Q

The contributions of L4 and L5 to the sacral plexus are by way of what?

A

The lumbosacral trunk

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3
Q

The sacral plexus forms on the ______ surface of what muscle?

A

Anterior

piriformis

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4
Q

Shortly after exiting the IVF/sacral foremen the nerve roots contributing to the sacral plexus divide into what?

A

Anterior and posterior divisions

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5
Q

The nerve to the quadratus femoris and gemellus inferior contain fibers from what nerves?

A

L4, L5, and S1

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6
Q

Quadratus femoris and gemellus inferior do what action?

A

Lateral rotation and adduction of thigh

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7
Q

The nerve to the quadratus femoris and gemellus inferior leave the pelvis through what?

A

Greater sciatic foramen

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8
Q

Is the obturator internus inside or outside the pelvis?

A

inside

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9
Q

Is the gemellus superior inside or outside the pelvis?

A

outside

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10
Q

The nerve to the obturator internus and gemellus superior carries fibers from which nerves?

A

L5, S1 and S2

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11
Q

The nerve to the obturator internus and gemellus superior exits the pelvis via what?

A

Greater sciatic foramen

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12
Q

The nerve to the obturator internus and gemellus superior gives off what branches after exiting the pelvis through the greater sciatic foremen?

A

Branches to gemellus superior

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13
Q

After giving off branches to the gemellus superior, the nerve to the obturator internus and gemellus superior does what?

A

Re- enters the pelvis through the lesser sciatic foramen

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14
Q

After re-entering the pelvis via the lesser sciatic foremen, the nerve to the obturator internus and gemellus superior supplies what?

A

Obturator internus

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15
Q

The obturator internus and gemellus superior contribute to what actions?

A

Lateral rotation and abduction of the thigh

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16
Q

The pudendal nerve contains fibers from what?

A

S2, S3, S4

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17
Q

The pudendal nerve leaves the pelvic cavity through what?

A

Greater sciatic foramen

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18
Q

After leaving the greater sciatic foremen, the pudendal nerve arches around what?

A

Ischial spine

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19
Q

After leaving the greater sciatic foremen and arching around the ischial spine, the pudendal nerve enters the perineum via what?

A

Lesser sciatic foramen

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20
Q

Once the pudendal nerve exits the lesser sciatic foremen if enters what?

A

The pudendal canal

21
Q

The pudendal canal is inferior to what?

A

Pubic symphysis

22
Q

The pudendal nerve travels through the pudendal canal in order to reach what in males and females?

A

Penis - males

Clitoris - females

23
Q

What is the terminal branch of the pudendal nerve?

A

Dorsal nerve of the pens/clitoris

24
Q

What branches come off the pudendal nerve within the pudendal canal?

A

Inferior rectal nerve
perineal nerve
Dorsal nerve of the penis/clitoris (terminal)

25
Q

The inferior rectal nerve carries what type of information?

A

Sensory and motor

26
Q

The inferior rectal nerve carries sensory information from where?

A

Skin around angus

Inferior 2/3 of anal canal

27
Q

The inferior rectal nerve carries motor supply to what muscle?

A

External anal sphincter

28
Q

The perineal nerve (off the pudendal nerve) divides into what?

A

Deep and superficial branches

29
Q

The deep branches of the perineal nerve supply what muscles? (4)

A

External anal sphincter
bulbospongiosis
ischiocavernosus
Superficial transverse perineum

30
Q

The superficial branches of the perineal nerve carries sensory fibers from what area in males?

A

Posterior scrotum,
Urethral mucosa
Bulb of penis

31
Q

The superficial branches of the perineal nerve carries sensory fibers from what are in females?

A

Labium majorum
External urethral orifice
vestibule

32
Q

The terminal branch of the pudendal nerve, the dorsal nerve of the clitoris/penis, supplies what muscles?

A

Deep transverse perineum

Urethral sphincter muscles

33
Q

The dorsal nerve of the penis carries sensory information from where?

A

Corpus cavernosum
glans penis
Skin covering the penis

34
Q

The dorsal nerve of the clitoris carries sensory information from where?

A

Corpus cavernosum

clitoris

35
Q

Individual muscular fibers off of the sacral plexus contain fibers from S4 supply what muscles?

A

levator and

coccygeus muscles

36
Q

The pelvic splanchnic nerves contain fibers from what?

A

S2, S3, and S4

37
Q

Which nerves are off of the anterior division of the sacral plexus?

A

Pelvic splanchnic nerves
Muscular fibers of S4
Pudendal nerve
Nerve to the obturator internus and gemellus superior
Nerve to the obturator externus and gemellus inferior

38
Q

What nerves come off of the posterior division of the sacral plexus?

A

Nerve to piriformis
Superior gluteal nerve
Inferior gluteal nerve
Perforating cutaneous nerve

39
Q

What two nerves are formed by branches of BOTH the anterior and posterior divisions?

A

Posterior cutaneous nerve of the thigh
Sciatic nerve
Common fibular nerve

40
Q

The nerve to the piriformis carries fibers from what?

A

S1 and S2

41
Q

The nerve to the piriformis supplies what?

A

Piriformis muscle

42
Q

The superior gluteal nerve is made up of fibers from what?

A

L4, L5, S1

43
Q

The superior gluteal nerve leaves pelvis through what and superior to what?

A

Greater sciatic foremen

piriformis

44
Q

The superior gluteal nerve splits into what?

A

Superior and inferior branches

45
Q

The superior branch of the superior gluteal nerve supplies what muscles?

A

gluteus medius and minimus

46
Q

The inferior branch of the superior gluteal nerve supplies what muscles?

A

Gluteus medius, minimus, and tensor fascia lata

47
Q

The inferior gluteal nerve carries fibers from what?

A

L5, S1, and S2

48
Q

The inferior gluteal nerve leaves the pelvis via the _____ inferior to what?

A

Greater sciatic foremen

piriformis

49
Q

The inferior gluteal nerve innervates what muscle?

A

Gluteus maximus

PNS exam III - mine (12 decks)

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