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PNS Cervical and Brachial Plexuses > Sacral plexus > Flashcards

Sacral plexus Flashcards

0
Q

L4 and L5 are able to contribute to the sacral plexus due to what

A

the lumbosacral trunk

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1
Q

what forms the sacral plexus

A

anterior primary rami of L4,L5 S1-S3 and part of S4

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2
Q

where does the sacral plexus form

A

on the piriformis muscle

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3
Q

where do the nerve roots that contribute to the sacral plexus divide into anterior and posterior divisions

A

shortly after exiting their IVF/sacral foramina

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4
Q

what roots contribute to quadratus femoris and gemllus inferior nerve

A

L4,L5, and S1

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5
Q

how does the nere to the quadratus femoris and gemellus inferior leave the pelvis

A

through the greater sciatic foramen

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6
Q

what is the action of the quadratus femoris and inferior gemellus

A

lateral rotation and adduction of the femur

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7
Q

what roots contribute to the nerve to the obturator internus and gemellus superior

A

L5, S1 and S2

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8
Q

how does the nerve to the obturator internus and gemellus superior leave the pelvis

A

through the greater sciatic foramen gibing off branches to the gemllus superior

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9
Q

how does the nerve to the obturator internus and gemllus superior supply the obturator internus

A

after exiting the pelvis it reenters the pelvis via the lesser sciatic foramen

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10
Q

what is the action of the obturator internus and gemllus superior

A

lateral rotation and abduction of the femur

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11
Q

what roots contribute to the pudendal nerve

A

S2,S3, and S4

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12
Q

what branches come off of the pudendal nerve within the pudendal cnal

A

the inferior rectal nerves, perineal nerve, and the dorsal nerve of the penis/clitoris

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13
Q

what sensory information does the inferior rectal nerves carry

A

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

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14
Q

what muscles are innervated by the inferior rectal nerves

A

the external anal sphincter

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15
Q

what does the perineal nerve divide into

A

deep and superficial branches

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16
Q

what muscles are supplied by the deep branches of the perineal nerve

A

the external anal sphincter, bulbocavernous , ishiocavernous, superficial transverse perineus

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17
Q

the deep branches of the perineal nerve carry primarily what type of information

A

motor

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18
Q

the superficial branches of the perineal nerve carry primarily what type of information

A

sensory

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19
Q

what does the superficial branches of the perineal nerve supply in males

A

posterior scrotum, urethral mucosa and bulb of the penis

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20
Q

what does the superficial branches of the perineal nerve supply in females

A

labium majus, external urethral orifice and vestibule

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21
Q

what is the terminal branch of the pudendal nerve

A

the dorsal nerve of the penis/clitoris

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22
Q

what muscles does the dorsal nerve of the penis/clitoris supply

A

deep transverse perineus, urethral sphincter muscles

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23
Q

what sensory information is carried in the dorsal nerve of the penis/clitoris

A

in males the corpus cavernosum, glans penis and skin covering the penis

in females the corpus cavernosum, and clitoris

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24
Q

what do individual muscular branches from the anterior division of the sacral plexus that contain S4 fibers supply

A

levator ani and cocygeus muscles

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25
Q

what type of information do pelvic splanchnic nerves carry

A

parasympathetic

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26
Q

what are the nerves that come off the posterior division of the sacral plexus

A

the nerve to the piriformis, superior gluteal nerve, inferior gluteal nerve, and the perforating cutaneous nerve

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27
Q

what fibers contribute to the nerve to the piriformis

A

S1, S2

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28
Q

what roots contribute to the superior gluteal nerve

A

L4,L5, and S1

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29
Q

what does the superior branch of the superior gluteal nerve supply

A

the gluteus medius and gluteus minimus

30
Q

what does the inferior branch of the superior gluteal nerve supply

A

the gluteus medius, gluteus miniumus, and tensor fascia lata

31
Q

what roots contribute to the inferior gluteal nerve

A

L5, S1, and S2

32
Q

what does the inferior gluteal nerve supply

A

the gluteus maximus

33
Q

what roots contribute to the perforating cutaneous nerve

A

S2 and S3

34
Q

what two landmarks can the sacrotuberous ligament be found between

A

the sacrum and ischial tuberocity

35
Q

what nerves are formed by both anterior and posterior divisions of the sacral plexus

A

the posterior cutaneous nerve of the thigh and the sciatic nerve

36
Q

what forms the posterior cutaneous nerve of the thigh

A

fibers from the anterior divisions of S2 and S3 as well as posterior divisions S1 and S2

37
Q

what does the posterior cutaneous nerve of the thigh supply

A

skin on the posterior and medial thigh

38
Q

what is the largest nerve in the human body

A

Sciatic nerve

39
Q

what is the diameter of the sciatic nerve

A

2cm

40
Q

what two nerves combine to from the sciatic nerve

A

tibial nerve (anterior division L4-S3) and common fibular nerve ( posterior division L4-S2)

41
Q

what roots contribute to the fibular nerve

A

anterior division of L4-S2

42
Q

what muscles fibers are given off from the common fibular nerve before the tibal nerve fibers separate from it

A

biceps femoris (short head)

43
Q

what does the lateral sural cutaneous nerve supply

A

skin on the lateral aspect of the leg

44
Q

what does the fibular communicatin branch combine with to form the sural nerve

A

the medial sural cutaneous nerve

45
Q

what two muscles are supplied by the superficial fibular nerve

A

fibularis longus and fibularis brevis

46
Q

what compartment are the fibularis longus and brevis located in

A

lateral compartment

47
Q

what does the medial dorsal cutaneous nerve and the intermediate dorsal cutaneous nerve supply

A

the skin ove the dorsum of the foot, except for the skin between the first two toes

48
Q

what muscles does the deep fibular branch supply

A

tibialis anterior, extensor digitorum longus and brevis, extensor hallicus longus, extensor hallucis brevis, and fibularis tertius

49
Q

what compartment are the following muscles located in and what is the main function as a group:
tibialis anterior, extensor digitorum longus and brevis, extensor hallicus longus, extensor hallucis brevis, and fibularis tertius

A

the anterior compartment functioning to dorsiflex the foot

50
Q

what does the terminal branch of the deep fibular nerve supply

A

the skin between the first two toes

51
Q

what is a clinical consideration with the common fibular nerve

A

steppage gait/foot drop

52
Q

is the common fibular nerve more lateral or medial

A

lateral

53
Q

is the tibial nerve more lateral or medial

A

medial

54
Q

what is larger the common fibular nerve or the tibial nerve

A

tibial

55
Q

what roots contribute to the tibial nerve

A

L4-S3

56
Q

while still combined with the common fibular nerve what muscles does the tibial nerve innervate

A

biceps femoris ( long head), semitendinosus, semimembranosus, adductor magnus

57
Q 
what do the following muscles all have in common:
biceps femoris ( long head), semitendinosus, semimembranosus,
A

they are part of the hamstring group and all originate on the ischial tuberocity

58
Q

what is given off in the popliteal fossa by the tibial nerve

A

articular braches that supply the knee joint as well as muscular branches, and a popliteal branch

59
Q

what muscles are supplied by the muscular branches given off in the popliteal fossa by the tibial nerve

A

popliteus, gastrocnemius (both heads), soleus, plantaris

60
Q

what compartment are the following muscles in, and what joints do each of them cross:
popliteus, gastrocnemius (both heads), soleus, plantaris

A

all in the superfiscial-posterior compartment , the popliteus cross the knee joint, the gastrocnemius (both heads) crosses both the knee and ankle joint. soleus and plantaris do not cross a joint

61
Q

what sensory information is carried by the interosseous nerve of the leg

A

from the tibial periosteum, ankle, and tibiofibular joints

62
Q

while in the leg the tibial nerve give off muscular branches to what muscles

A

flexor digitorum longus, and flexor hallucis longus

63
Q

while in the leg the tibial nerve gives off what sensory branch and what does it supply

A

the medial calcaneal branches that supply the skin over the medial heel

64
Q

what are the terminal branches of the tibial nerve

A

the medial plantar nerve and the lateral plantar nerve

65
Q

what muscles does the medial plantar nerve supply before it devides

A

abductor hallucis, flexor digitorum brevis, flexor hallucis brevis

66
Q

what does the medial plantar nerve divide into

A

the common plantar digital nerves

67
Q

what motor supply is from the common plantar digital nerves supply

A

motor supply to lumbercals 1 and 2

68
Q

how is sensory innervation to between the toes accomplished by the common plantar digital nerves

A

by dividing into propler plantar digital nerves

69
Q

what branches does the lateral plantar nerve divide into

A

superficial and deep branches

70
Q

what does the superficial branch of the lateral plantar nerve supply

A

skin around the 5th digit

71
Q

what does the deep branch of the lateral plantar nerve supply

A

adductor hallucis, flexor digiti minimi brevis, lateral lumricals, and interossei muscles

72
Q

what are the clinical considerations associated with the tibial nerve

A

flexor paralysis, hammer toes, “claw foot”

PNS Cervical and Brachial Plexuses (9 decks)

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