Sacral plexus

Question 0

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

Answer 0

the lumbosacral trunk

Question 1

what forms the sacral plexus

Answer 1

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

Question 2

where does the sacral plexus form

Answer 2

on the piriformis muscle

Question 3

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

Answer 3

shortly after exiting their IVF/sacral foramina

Question 4

what roots contribute to quadratus femoris and gemllus inferior nerve

Answer 4

L4,L5, and S1

Question 5

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

Answer 5

through the greater sciatic foramen

Question 6

what is the action of the quadratus femoris and inferior gemellus

Answer 6

lateral rotation and adduction of the femur

Question 7

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

Answer 7

L5, S1 and S2

Question 8

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

Answer 8

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

Question 9

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

Answer 9

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

Question 10

what is the action of the obturator internus and gemllus superior

Answer 10

lateral rotation and abduction of the femur

Question 11

what roots contribute to the pudendal nerve

Answer 11

S2,S3, and S4

Question 12

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

Answer 12

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

Question 13

what sensory information does the inferior rectal nerves carry

Answer 13

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

Question 14

what muscles are innervated by the inferior rectal nerves

Answer 14

the external anal sphincter

Question 15

what does the perineal nerve divide into

Answer 15

deep and superficial branches

Question 16

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

Answer 16

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

Question 17

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

Answer 17

motor

Question 18

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

Answer 18

sensory

Question 19

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

Answer 19

posterior scrotum, urethral mucosa and bulb of the penis

Question 20

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

Answer 20

labium majus, external urethral orifice and vestibule

Question 21

what is the terminal branch of the pudendal nerve

Answer 21

the dorsal nerve of the penis/clitoris

Question 22

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

Answer 22

deep transverse perineus, urethral sphincter muscles

Question 23

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

Answer 23

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

in females the corpus cavernosum, and clitoris

Question 24

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

Answer 24

levator ani and cocygeus muscles

Question 25

what type of information do pelvic splanchnic nerves carry

Answer 25

parasympathetic

Question 26

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

Answer 26

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

Question 27

what fibers contribute to the nerve to the piriformis

Answer 27

S1, S2

Question 28

what roots contribute to the superior gluteal nerve

Answer 28

L4,L5, and S1

Question 29

what does the superior branch of the superior gluteal nerve supply

Answer 29

the gluteus medius and gluteus minimus

Question 30

what does the inferior branch of the superior gluteal nerve supply

Answer 30

the gluteus medius, gluteus miniumus, and tensor fascia lata

Question 31

what roots contribute to the inferior gluteal nerve

Answer 31

L5, S1, and S2

Question 32

what does the inferior gluteal nerve supply

Answer 32

the gluteus maximus

Question 33

what roots contribute to the perforating cutaneous nerve

Answer 33

S2 and S3

Question 34

what two landmarks can the sacrotuberous ligament be found between

Answer 34

the sacrum and ischial tuberocity

Question 35

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

Answer 35

the posterior cutaneous nerve of the thigh and the sciatic nerve

Question 36

what forms the posterior cutaneous nerve of the thigh

Answer 36

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

Question 37

what does the posterior cutaneous nerve of the thigh supply

Answer 37

skin on the posterior and medial thigh

Question 38

what is the largest nerve in the human body

Answer 38

Sciatic nerve

Question 39

what is the diameter of the sciatic nerve

Answer 39

2cm

Question 40

what two nerves combine to from the sciatic nerve

Answer 40

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

Question 41

what roots contribute to the fibular nerve

Answer 41

anterior division of L4-S2

Question 42

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

Answer 42

biceps femoris (short head)

Question 43

what does the lateral sural cutaneous nerve supply

Answer 43

skin on the lateral aspect of the leg

Question 44

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

Answer 44

the medial sural cutaneous nerve

Question 45

what two muscles are supplied by the superficial fibular nerve

Answer 45

fibularis longus and fibularis brevis

Question 46

what compartment are the fibularis longus and brevis located in

Answer 46

lateral compartment

Question 47

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

Answer 47

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

Question 48

what muscles does the deep fibular branch supply

Answer 48

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

Question 49

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

Answer 49

the anterior compartment functioning to dorsiflex the foot

Question 50

what does the terminal branch of the deep fibular nerve supply

Answer 50

the skin between the first two toes

Question 51

what is a clinical consideration with the common fibular nerve

Answer 51

steppage gait/foot drop

Question 52

is the common fibular nerve more lateral or medial

Answer 52

lateral

Question 53

is the tibial nerve more lateral or medial

Answer 53

medial

Question 54

what is larger the common fibular nerve or the tibial nerve

Answer 54

tibial

Question 55

what roots contribute to the tibial nerve

Answer 55

L4-S3

Question 56

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

Answer 56

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

Question 57

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

Answer 57

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

Question 58

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

Answer 58

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

Question 59

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

Answer 59

popliteus, gastrocnemius (both heads), soleus, plantaris

Question 60

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

Answer 60

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

Question 61

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

Answer 61

from the tibial periosteum, ankle, and tibiofibular joints

Question 62

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

Answer 62

flexor digitorum longus, and flexor hallucis longus

Question 63

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

Answer 63

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

Question 64

what are the terminal branches of the tibial nerve

Answer 64

the medial plantar nerve and the lateral plantar nerve

Question 65

what muscles does the medial plantar nerve supply before it devides

Answer 65

abductor hallucis, flexor digitorum brevis, flexor hallucis brevis

Question 66

what does the medial plantar nerve divide into

Answer 66

the common plantar digital nerves

Question 67

what motor supply is from the common plantar digital nerves supply

Answer 67

motor supply to lumbercals 1 and 2

Question 68

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

Answer 68

by dividing into propler plantar digital nerves

Question 69

what branches does the lateral plantar nerve divide into

Answer 69

superficial and deep branches

Question 70

what does the superficial branch of the lateral plantar nerve supply

Answer 70

skin around the 5th digit

Question 71

what does the deep branch of the lateral plantar nerve supply

Answer 71

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

Question 72

what are the clinical considerations associated with the tibial nerve

Answer 72

flexor paralysis, hammer toes, "claw foot"