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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
The inferior rectal nerve carries what type of information?
Sensory and motor
26
The inferior rectal nerve carries sensory information from where?
Skin around angus | Inferior 2/3 of anal canal
27
The inferior rectal nerve carries motor supply to what muscle?
External anal sphincter
28
The perineal nerve (off the pudendal nerve) divides into what?
Deep and superficial branches
29
The deep branches of the perineal nerve supply what muscles? (4)
External anal sphincter bulbospongiosis ischiocavernosus Superficial transverse perineum
30
The superficial branches of the perineal nerve carries sensory fibers from what area in males?
Posterior scrotum, Urethral mucosa Bulb of penis
31
The superficial branches of the perineal nerve carries sensory fibers from what are in females?
Labium majorum External urethral orifice vestibule
32
The terminal branch of the pudendal nerve, the dorsal nerve of the clitoris/penis, supplies what muscles?
Deep transverse perineum | Urethral sphincter muscles
33
The dorsal nerve of the penis carries sensory information from where?
Corpus cavernosum glans penis Skin covering the penis
34
The dorsal nerve of the clitoris carries sensory information from where?
Corpus cavernosum | clitoris
35
Individual muscular fibers off of the sacral plexus contain fibers from S4 supply what muscles?
levator and | coccygeus muscles
36
The pelvic splanchnic nerves contain fibers from what?
S2, S3, and S4
37
Which nerves are off of the anterior division of the sacral plexus?
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
What nerves come off of the posterior division of the sacral plexus?
Nerve to piriformis Superior gluteal nerve Inferior gluteal nerve Perforating cutaneous nerve
39
What two nerves are formed by branches of BOTH the anterior and posterior divisions?
Posterior cutaneous nerve of the thigh Sciatic nerve Common fibular nerve
40
The nerve to the piriformis carries fibers from what?
S1 and S2
41
The nerve to the piriformis supplies what?
Piriformis muscle
42
The superior gluteal nerve is made up of fibers from what?
L4, L5, S1
43
The superior gluteal nerve leaves pelvis through what and superior to what?
Greater sciatic foremen | piriformis
44
The superior gluteal nerve splits into what?
Superior and inferior branches
45
The superior branch of the superior gluteal nerve supplies what muscles?
gluteus medius and minimus
46
The inferior branch of the superior gluteal nerve supplies what muscles?
Gluteus medius, minimus, and tensor fascia lata
47
The inferior gluteal nerve carries fibers from what?
L5, S1, and S2
48
The inferior gluteal nerve leaves the pelvis via the _____ inferior to what?
Greater sciatic foremen | piriformis
49
The inferior gluteal nerve innervates what muscle?
Gluteus maximus

PNS exam III - mine (12 decks)

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