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PNS > Exam 3- Sacral Plexus > Flashcards

Exam 3- Sacral Plexus Flashcards

1
Q

What branch of the sacral plexus travels through the sacral hiatus

A

Posterior ramus of S5

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2
Q

Which way does the posterior sacral rami decrease in size?

A

Superior to Inferior

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3
Q

The posterior rami of S1-S3 divide into what two branches

A

Medial and lateral branches

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4
Q

What branch of the posterior rami of S1-S3 is motor?

A

The medial branch is motor, supplies the adjacent Multifidus

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5
Q

The lateral posterior branches of S1-S3 supply the

A

Skin over the buttocks and combine with L5 and S4

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6
Q

What branches of the sacral plexus combine with the coccygeal posterior rami to supply the skin over the coccyx

A

S4 and S5

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7
Q

How many sacral sympathetic ganglia are there

A

Three or four

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8
Q

The anterior primary of each sacral nerve receives postganglionic fibers via

A

A gray ramus communicans

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9
Q

The gray ramus communicans sends what kind of fibers to the anterior primary rami of each sacral nerve?

A

Postganglionic sympathetic fibers

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10
Q

The sacral plexus is formed by the anterior primary rami of

A

L4,L5, S1-S3, and part of S4

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11
Q

How does L4, L5 contribute to the Sacral plexus

A

Via the lumbosacral trunk

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12
Q

Where is the sacral plexus formed?

A

On the anterior surface of the piriformis muscle

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13
Q

What fibers make up the nerve to the quadratus femoral and gemellus inferior

A

L4,L5,S1 nerves

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14
Q

The nerve to the quadratus femoris and gemellus inferior exit the pelvis through

A

The greater sciatic foramen

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15
Q

What muscles contribute to the lateral rotation and adduction of the thigh

A

Nerve to the quadratus femoris and gemellus inferior

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16
Q

The nerve to obturator internus and gemellus superior is fibers from

A

L5, S1,S2

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17
Q

THe nerve to the obturator internus and gemellus superior exits the pelvis through the

A

Greater sciatic foramen

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18
Q

The nerve to obturator internus re enters the pelvis via the

A

Lesser sciatic foramen to supply obturator internus

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19
Q

What muscles contribute to lateral rotation and abduction of the thigh

A

Nerve to obturator internus and gemellus superior

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20
Q

The pudendal nerve contains fibers from

A

S2,S3,S4

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21
Q

The pudendal nerves course is

A

Leaves pelvis via greater sciatic foramen, arches around the ischial spine, and into the perineum via the lesser sciatic foramen

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22
Q

The pudendal nerve travels in the

A

Pudendal canal, inferior to the pubic symphysis to reach the dorsal side of the Penis or Clitoris

23
Q

The inferior rectal nerves are a branch of

A

The pudendal nerve

24
Q

The inferior rectal nerves carries sensory info from

A

The skin around the anus and the inferior 2/3 of the anal canal

25
Q

The inferior rectal nerves is the motor supply to

A

External anal sphincter

26
Q

The perineal nerve is a branch of the

A

Pudendal nerve

27
Q

The deep branches of the perineal nerve supply what four muscles

A

External anal sphincter
Bulbosponsiosus
Ischiocavernosus
Superficial transverse perineus

28
Q

The superficial branches of the perineal nerve supplies

A

Sensory fibers

Males- posterior sacrum, urethral mucosa, bulb of penis

Females- labium majus, external urethral orifice, vestibule

29
Q

What is the terminal branch of the pudendal nerve

A

The dorsal nerve of the penis/clitoris

30
Q

What does the dorsal nerve of the penis/clitoris motor supply

A

Deep transverse perineus

Urethral sphincter muscles

31
Q

The dorsal nerve sensory fibers supply

A

Males- corpus cavernosum, glans penis, skin covering the penis

Females- corpus cavernosum, clitoris

32
Q

What supplies the levator ani and coccygeus muscles

A

Muscular branches of S4

33
Q

The pelvic splanchnic nerve contains fibers from

A

S2,S3,S4

34
Q

The nerve to piriformis contains fibers from

A

S1,S2

35
Q

The superior gluteal nerve is made up of fibers

A

L4,L5,S1

36
Q

The superior gluteal nerve leaves the pelvis via

A

Greater sciatic foramen, superior to the piriformis and splits into superior and inferior branches

37
Q

The superior gluteal nerve superior branches supply

A

Gluteus medius and minimus

38
Q

The inferior branches of the superior gluteal nerve supply

A

Gluteus medius, gluteus minimus, tensor fascia late

39
Q

The inferior gluteal nerve fibers are from

A

L5,S1,S2

40
Q

The inferior gluteal nerve leaves the pelvis via the

A

Greater sciatic foramen inferior to piriformis,

41
Q

What muscles does the inferior gluteal nerve supply

A

Gluteus Maximus

42
Q

The perforating cutaneous nerve contains fibers from

A

S2,S3

43
Q

The perforating cutaneous nerve travels

A

Through the sacrotuberous ligament, ultimately reaching lower medial aspects of the buttocks

44
Q

The perforating cutaneous nerve may also be formed by a branch off of

A

The pudendal nerve or be absent

45
Q

The posterior cutaneous nerve of the thigh is made up of

A

Anterior division of S2,S3

Posterior divisions of S1,S2

46
Q

The posterior cutaneous nerve of the thigh travels

A

Exits pelvis through greater sciatic foramen, descends through posterior thigh and inferior to the leg where it will communicate with the SURAL NERVE

47
Q

The posterior cutaneous nerve of the thigh supplies the skin on the

A

Posterior and medial thigh

48
Q

What is the largest nerve in the human body

A

Sciatic nerve

49
Q

What is the size of the sciatic nerve

A

2 cm in diameter

50
Q

What are the two nerves that combine to make up the sciatic nerve

A

Tibial nerve and common fibular nerve

51
Q

The tibial nerve is formed by the

A

Anterior divisions of L4-S3

Is located medial

52
Q

The common fibular nerve is made up of

A

Posterior divisions L4-S2

53
Q

The sciatic nerve exits the pelvis in a common shealth through the

A

Greater sciatic foramen, below the piriformis

54
Q

The sciatic nerve travels posterior aspect of the

A

Adductor Magnus, approx. 2/3 of the way to the knee, where it splits into common fibular and tibial

PNS (11 decks)

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