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R - anatomy > sacral plexus > Flashcards

sacral plexus Flashcards

1
Q

what is the spinal root value of the sacral plexus

A

anterior fibres of S1-S4

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2
Q

what nerves originate from the sacral plexus

A 
superior gluteal 
inferior gluteal 
sciatic 
posterior femoral cutaneous 
pudendal nerve
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3
Q

what muscle does the sacral plexus sit on

A

piriformis

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4
Q

what foramen do most of the nerves pass through

A

greater sciatic

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5
Q

root value of superior gluteal nerve

A

L4-S1

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6
Q

what muscles does the superior gluteal nerve innervate

A

gluteus minimus
gluteus medius
tensor fascia lata

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7
Q

what is the root value for the inferior gluteal nerve

A

L5-S2

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8
Q

what muscle does the inferior gluteal nerve innervate

A

gluteus maximus

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9
Q

what is the root value for the sciatic nerve

A

L4-S3

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10
Q

what muscles does the sciatic nerve innervate

A

all muscles in posterior compartment of thigh, leg and sole of foot

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11
Q

what areas of skin does the sciatic nerve supply

A

tibial branch - posterolateral leg, lateral foot, sole of foot
common fibular - lateral leg, dorsum of foot

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12
Q

what is the root value of the posterior femoral cutaneous nerve

A

S1-S3

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13
Q

what area of skin does the posterior femoral cutaneous nerve innervate

A

posterior surface of thigh and leg

perineal branch innervates most skin of perineum

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14
Q

root value of pudendal nerve

A

S2-S4

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15
Q

what muscles does the pudendal nerve innervate

A

skeletal muscles in perineum
external anal sphincter
external urethral sphincter
levator ani

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16
Q

what area of skin does the pudendal nerve innervate

A

penis
clitoris
skin around anus
anal canal

17
Q

what foramina does the pudendal nerve pass through

A

greater sciatic foramen

lesser sciatic foramen

18
Q

what ligament does the pudendal nerve cross to go from the greater to lesser sciatic foramen

A

sacrospinous ligament

19
Q

what forms the pudendal canal

A

the fascia of the obturator internus

20
Q

where is the pudendal canal

A

inner aspect of ischium
below obturator foramen
moves posterior to anterior

21
Q

what are the contents of the pudendal canal

A

internal pudendal artery and veins

pudendal nerve

22
Q

what branches does the pudendal nerve give off in the pudendal canal

A

inferior rectal

perineal nerve

23
Q

what does the pudendal nerve continue as in the pudendal canal

A

dorsal nerve of penis or clitoris

24
Q

what muscles does the perineal nerve inervate

A

levator ani muscles
bulbospongiosus
ischiocavernosus

25
Q

what does the dorsal nerve innervate

A

skin of penis or clitoris

26
Q

what anatomical pathway does the pudendal nerve take

A

goes through greater sciatic foramen anterior to piriformis

follows ischial spine to enter pelvis again through the lesser sciatic foramen and supplies the perineum

27
Q

describe the anatomical pathway of the superior gluteal nerve

A

passes through greater sciatic foramen over piriformis to supply gluteus medius and minimus

28
Q

describe the anatomical pathway of the inferior gluteal nerve

A

passes under piriformis through greater sciatic foramen to supply gluteus maximus

29
Q

describe the anatomical pathway of the obturator nerve

A

from lumbar plexus
runs along lateral wall of pelvis
enters obturator canal over the top of psoas major and exists the pelvis to supply the medial thigh

30
Q

obturator nerve route

A

L2-4

31
Q

superior and inferior gluteal nerve routes

A

L4-S1 sup

L5-S2 inf

32
Q

where does autonomic innervation of the pelvis come from

A

sacral and lumbar sympathetic trunks (located medial to spinal nerves)

33
Q

what nerve innervates the skin of the external genitalia

A

ilioinguinal

34
Q

what effect do parasympathetic nerves have on bladder, rectum and penis

A

contracts bladder
contracts rectum
erection

35
Q

what nerves cause ejaculation

A

sympathetic
point and shoot
para for erection, symp for ejaculation

R - anatomy (9 decks)

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