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BMSC Regional Gross Anatomy 2 > Pelvic nerves > Flashcards

Pelvic nerves Flashcards

1
Q

what is the lumbosacral trunk

A

L4 and L5 nerve roots form a lumbosacral trunk which carry nerve fibres to join S1 nerve root at the start of the sacral plexus

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2
Q

what is the sacral component of the sacral plexus

A

S1-S4

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3
Q

what is the largest nerve from the sacral plexus

A

sciatic nerve

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4
Q

what are the roots of the sciatic nerve

A

L4,L5,S1-3 (L4-S3)

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5
Q

the sciatic nerve forms on the anterior surface of what muscle

A

piriformis

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6
Q

where does the sciatic nerve form

A

anterior surface of piriformis muscle on the lateral internal wall of the pelvis

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7
Q

the sciatic nerve passes out of the pelvis via what to reach the gluteal region

A

greater sciatic notch

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8
Q

how is the sciatic nerve identified in the gluteal region

A

very large nerve passing from beneath piriformis to then pass down the posterior surface of the thigh

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9
Q

what does the sciatic nerve supply

A

posterior compartment of the thigh (hamstring muscles) and then divides into branches that supply all of the muscles of the leg and foot
it also carries sensory fibres

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10
Q

what are the roots of the superior gluteal nerve

A

L4, L5, S1

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11
Q

what are the roots of the inferior gluteal nerve

A

L5, S1, S2

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12
Q

what does the superior gluteal nerve supply

A

gluteus medius and minimus

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13
Q

what does the inferior gluteal nerve supply

A

gluteus maximus

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14
Q

how are the superior and inferior gluteal nerves identified in the gluteal region

A

pass through the greater sciatic foramen immediately above and below piriformis

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15
Q

what are the roots of the nerve to the obturator internus

A

direct L5 - S1

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16
Q

what does the nerve to obturator internus supply

A

obturator internus

may also supply superior gemellus muscle

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17
Q

what are the roots of the nerve to piriformis

A

direct from S1 - S2

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18
Q

what does nerve to piriformis supply

A

piriformis

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19
Q

levator ani and coccygeus both receive fibres from what nerve root

A

S4

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20
Q

levator ani receives direct fibres from S4 nerve root and also

A

pudendal nerve

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21
Q

what are the roots of the pudendal nerve

A

S2-4

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22
Q

why is the pudendal nerve important in maintaining continence

A

supplies both the external (voluntary) sphincters of the urethra and anal canal

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23
Q

the pudendal nerve forms from nerve roots ____ in the pelvis close to the ____ ____

A

S2-4, close to the pelvic floor

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24
Q

pudendal nerve passes through the ____, goes around the ____ and then through the ____ to reach the _____ and then the ____

A

pudendal nerve passes through the greater sciatic foramen, goes around the ischial spine and then through the lesser sciatic foramen to reach the anal triangle and then the perineum

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25
what is used as a landmark in pudendal nerve block
ischial spine
26
what muscles does the pudendal nerve suppply
levator ani external anal and external urethral sphincters bulbospongiosus ischiocavernosus
27
the pudendal nerve provides what kind of innervation
motor and sensory
28
the internal organs of the pelvis and the erectile tissues of the perineum are supplied by
ANS
29
where is the superior hypogastric plexus found
sits at the bifurcation of the aorta into the common iliac arteries
30
the superior hypogastric plexus carries what
sympathetic nerve fibres
31
where is the inferior hypogastric plexus found
internal lateral wall of the pelvis (one on each side)
32
the inferior hypogastric plexus carries what
mix of sympathetic and parasympathetic fibres
33
the vagus nerve supplies the abdominal viscera with parasympathetic innervation up until
2/3 transverse colon
34
the hindgut was supplied with parasympathetic innervation from
pelvic splanchnic nerves S2-4
35
the sympathetic supply to the pelvic organs is from
lumbar and sacral splanchnic nerves derived from the sympathetic chains
36
the pelvic organs receive parasympathetic supply from
pelvic splanchnic nerves from roots S2-4
37
sympathetic stimulation does what to the rectum
decrease movement
38
sympathetic stimulation does what to the internal anal and urethral sphincters
contract
39
sympathetic stimulation does what to the bladder detrusor muscle
relax
40
sympathetic stimulation does what to the male reproductive organs
ejaculation - contracts ductus deferens and seminal vesicles
41
sympathetic stimulation does what to the uterus
relax/contract - modified by hormonal pathways
42
sympathetic stimulation does what to the arteries
vasoconstriction
43
Parasympathetic stimulation does what to the rectum and anal canal
increase motility
44
Parasympathetic stimulation does what to the internal anal sphincter
relax
45
Parasympathetic stimulation does what to the bladder
contracts detrusor and inhibits contraction of the internal sphincter
46
Parasympathetic stimulation does what to the seminal vesicles, ductus deferens and uterus
no effect
47
Parasympathetic stimulation does what to the arteries
vasodilation
48
Parasympathetic stimulation causing vasodilation allows what
erection
49
parasympathetic supply to the pelvis comes from
pelvic splanchnic nerves S2-4
50
what nerves supply the penis
dorsal nerve of the penis | cavernous nerves
51
the dorsal nerve of the penis originates from what
pudendal nerve
52
the cavernous nerves originate from what
prostatic nerve plexus
53
the dorsal nerve of the penis is what type of nerve
somatic sensory and sympathetic
54
the cavernous nerves carry what type of innervation
parasympathetic
55
the penis gets somatic sensory and sympathetic innervation from what nerve
dorsal nerve of penis from pudendal nerve (S2-4)
56
what nerve supplies the male perineal muscles e.g. bulbospongiosus and ischiocavernosus
perienal branch from the pudendal nerve
57
the perineal branch of the pudendal nerve carries what type of innervation
somatic motor
58
what nerves supply the scrotum
anterior and posterior scrotal nerves
59
the anterior scrotal nerve originates from what
ilioinguinal and genitofemoral
60
the posterior scrotal nerve originates from what
perineal branch of the pudendal nerve
61
the anterior and posterior scrotal nerves carry what type of innervation
somatic sensory
62
what nerve supplies the anterior perineum in females
anterior labial nerve
63
the anterior labial nerve originates from what
ilioinguinal and genitofemoral nerves
64
the anterior labial nerve carries what innervation
somatic sensory
65
what nerve supplies the posterior perineum in females
perineal branch
66
the perineal branch that supplies the posterior perineum in females originates from what
pudendal nerve and posterior cutaneous nerve of the thigh
67
the perineal branch that supplies the posterior perineum in females carries what type of innervation
somatic sensory
68
what nerve supplies the labia
posterior labial nerve
69
where does the posterior labial nerve originate
pudendal nerve
70
what kind of innervation does the posterior labial nerve carry
somatic sensory
71
what nerve supplies the orifice of the vagina
deep branch of the pudendal nerve
72
what kind of innervation does the deep branch of the pudendal nerve carry
somatic sensory
73
what nerves innervate the superficial perineal muscles in the female
muscular branches of the pudendal nerve
74
what innervation do the muscular branches of the pudendal nerve carry
somatic motor
75
what is the innervation of the clitoris and deep perineal muscles
dorsal nerve of the clitoris
76
where does the dorsal nerve of the clitoris originate
pudendal nerve
77
what kind of innervation does the dorsal nerve of the clitoris carry
somatic motor and sensory
78
what is the innervation of the bulb of the vestibule and clitoris
cavernous nerves
79
where do the cavernous nerves originate
utero-vaginal plexus
80
what kind of innervation do the cavernous nerves carry
parasympathetic
81
what nerves supply the dermatomes of the perineum
sacral nerves
82
sensory innervation to the genitalia
pudendal nerve
83
sensory innervation to the anterior skin of the pelvis
ilioinguinal, genitofemoral and pudendal nerves

BMSC Regional Gross Anatomy 2 (36 decks)

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