Sacral Plexus

Question 1

What spinal nerves form the sacral plexus?

Answer 1

anterior primary rami of L4,L5,S1-3 and part of S4

Question 2

How do L4 and L5 contribute to the plexus?

Answer 2

the lumbo sacral trunk

Question 3

where does the sacral plexus form?

Answer 3

anterior surface of the piriformis muscle

Question 4

what do the sacral nerve roots divide into after leaving the sacral foramen?

Answer 4

anterior and posterior divisions

Question 5

What are the branches off the anterior divisions?

Answer 5

Nerve to the quadrates femoris & Gemellus inferior
Nerve to the obturator interns and gemellus superior
pudendal nerve
pelvic splanchnic nerves

Question 6

What nerves from the nerve to the quadrates femurs and gemellus inferior?

Answer 6

L4, L5, and S1

Question 7

How does the nerve to the Quadratus femurs and Gemellus Inferior leave the pelvis?

Answer 7

Greater sciatic foramen

Question 8

What motion fdoes the Nerve to the Quadratus Femoris and Gemellus Inferior contribute to?

Answer 8

lateral rotation and adduction of the thigh

Question 9

What spinal nerves form the Obturator Internus and Gemellus superior?

Answer 9

L5, S1, S2

Question 10

How does the nerve to the obturator internus an gemellus superior leave the pelvis?

Answer 10

the greater sciatic foramen

Question 11

What does the nerve to the obturator internus and gemellus superior give off after leaving the pelvis?

Answer 11

branches to te gemellus superior

Question 12

What does the nerve to the obturator internus and gemellus superior re-enter the pelvis?

Answer 12

the lesser sciatic foramen

Question 13

Once the nerve to the obturator interns and gemellus superior re-enters the pelvis, what muscle does it supply?

Answer 13

the obturator internus

Question 14

The muscle supplies by the nerve to the obturator interns and gemelus superior contribute to what motion?

Answer 14

lateral rotation and abduction of the thigh

Question 15

Which spinal nerves make up the pudendal nerve?

Answer 15

S2, S3, S4

Question 16

How does the pudendal nerve exit the pelvis?

Answer 16

the greater sciatic foramen

Question 17

Where does the pudendal nerve travel through to the penis and clitoris?

Answer 17

the pudendal canal

Question 18

How does the pudendal nerve get into the periosteum?

Answer 18

the lesser sciatic foramen

Question 19

what beaches come off of the pudendal nerve within the pudendal canal?

Answer 19

inferior rectal nerve
perineal nerve
terminal branch of the pudendal nerve

Question 20

Where do the inferior rectal nerves carry sensory information from?

Answer 20

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

Question 21

What muscle does the inferior rectal nerve supply?

Answer 21

external anal sphincter

Question 22

What are two branches of the perineal nerve (pudendal branch)?

Answer 22

deep (motor) and superficial (sensory) branches

Question 23

What muscle do the deep branches of the perineal nerve supply?

Answer 23

external anal sphincter
bulbospongeosum
ischiocavernosum
superficial transverse perenius

Question 24

Where does the superficial branch of the perineal nerve bring sensory info from?

Answer 24

posterior scrotum
urethral mucosa
bulb of penis
labium malus
external urethral orifice
vistibule

Question 25

What is the terminal branch of the pudendal nerve?

Answer 25

the dorsal nerve of the penis/clitoris

Question 26

What does the dorsal nerve supply?

Answer 26

deep transverse perineum and urethral sphincter muscles

Question 27

Where does the dorsal nerve carry fibers from in males?

Answer 27

corpus cavernosum glans penis skin covering penis

Question 28

Where does the dorsal nerve carry fibers from in females?

Answer 28

corpus cavernosum and clitoris

Question 29

What do the individual muscle fibers of the anterior division supply?

Answer 29

levator ani and coccygeal muscles

Question 30

What fibers are in the Pelvic Splachnic Nerve?

Answer 30

S2, S3, S4,

Question 31

What are the branches of the posterior division of the Sacral Plexus?

Answer 31

Nerve to the piriformis superior gluteal nerve inferior gluteal nerve perferating cutaneous nerve

Question 32

What does the nerve to the piriformis supply?

Answer 32

the piriformis

Question 33

What spinal nerves contribute to the nerve to the piriformis?

Answer 33

S1 and S2

Question 34

What spinal nerves make up the superior gluteal nerve?

Answer 34

L4, L5, S1

Question 35

How does the superior gluteal nerve leave the plexus?

Answer 35

The greater sciatic foramen

Question 36

What two branches does the superior gluteal nerve become after leaving the pelvis?

Answer 36

superior and inferior branches

Question 37

What does the superior branch of the superior gluteal nerve supply?

Answer 37

Gluteus Medius and minimus

Question 38

What does the inferior branch of the Superior Gluteal Nerve supply?

Answer 38

Gluteus medius, gluteaus minimus, and tensor fascia lata

Question 39

The inferior gluteal nerve caries which spinal nerves?

Answer 39

L5, S1, S2

Question 40

How does the inferior gluteal nerve leave the pelvis?

Answer 40

the Greater Sciatic foramen

Question 41

What muscle does the inferior gluteal nerve innervate?

Answer 41

Gluteus maximus

Question 42

What fibers are in the perforating cutaneous nerve?

Answer 42

S2 and S3

Question 43

What structure does the perforating cutaneous nerve travel through to reach the lower medial aspects of the buttocks?

Answer 43

sacrotuberous ligament

Question 44

The Perferating Cutaneous Nerve is ALWAYS present.

Answer 44

False; sometimes it is absent, sometimes it is a branch off of the pudendal nerve

Question 45

What spinal nerves does the posterior cutaneous nerve of the thigh carry?

Answer 45

anterior divisions of S2 and S3 | posterior divisions of S1 and S2

Question 46

How does the posterior cutaneous nerve of he thigh leave the pelvis?

Answer 46

the greater sciatic foramen

Question 47

What nerve will the posterior cutaneous nerve of the thigh communicate with while descending the posterior thigh and inferior leg?

Answer 47

Sural nerve

Question 48

What does the Posterior Cutaneous nerve of the thigh supply?

Answer 48

skin on the posterior and medial thigh

Question 49

What is the largest nerve in the human body?

Answer 49

the Sciatic nerve

Question 50

How large is the sciatic nerve?

Answer 50

2 cm diameter

Question 51

How does the sciatic nerve leave the pelvis?

Answer 51

Through the greater sciatic foramen (below the piriformis)

Question 52

The sciatic nerve plits 2/3 the way down before the knee into which two nerves?

Answer 52

tibial and common fibular

Question 53

Which of the two sciatic nerve branches is medial?

Answer 53

Tibial nerve

Question 54

Before separating, where does the sciatic nerve branch to supply a muscle?

Answer 54

biceps femoris (short head)

Question 55

What is ter nerve course of the common fibular nerve?

Answer 55

around the lateral aspect of the fibula

Question 56

What two branches are given off the common fibular nerve at the lateral popliteal fossa?

Answer 56

lateral sural cutaneous nerve and fibular communicating branch

Question 57

What does the lateral sural cutaneous nerve supply?

Answer 57

the skin on the lateral aspect of the leg

Question 58

what happens to the fibular communicating branch?

Answer 58

it becomes the aural nerve after combining with the medial sural cutaneous

Question 59

After leaving the popliteal fossa, the common fibular nerve splits into what two nerves?

Answer 59

superficial and deep fibular nerves

Question 60

What two muscles does the superficial fibular nerve supply?

Answer 60

fibularis longus and fibularis brevis

Question 61

Superficial fibular nerve splits into what two nerves in the foot?

Answer 61

medial and intermediate dorsal cutaneous nerve

Question 62

What does the medial an intermediate dorsal cutaneous nerve of the foot combine to supply?

Answer 62

sensory from the skin on the dorsum of the food

Question 63

What muscles does the deep fibular nerve supply?

Answer 63

``` Tibialis anterior extensor digitorum longus extensor digitorum brevis extensor hllicus longus extensor hallicus brevis fibularis tertius ```

Question 64

What branch of the common fibular nerve supplies the extensor muscles of the foot and toes?

Answer 64

deep fibular nerve

Question 65

which nerve off the common fibular nerve has a terminal sensory branch that supplies the skin between the first two toes?

Answer 65

Deep fibular nerve

Question 66

What is a clinical aspect of the common fibular nerve?

Answer 66

steppage gate

Question 67

What nerve is larger than the common fibular nerve?

Answer 67

Tibial nerve

Question 68

Before leaving the common fibular nerve, what muscle does the tibial nerve supply?

Answer 68

biceps femoris (long head) semitendinosus semimembranosis adductor magnus

Question 69

In the popliteal fossa, what branches are given off of the tibial nerve?

Answer 69

articular branches muscular branches popliteal branch

Question 70

What does the articular branch of the tibial nerve supply?

Answer 70

knee joint

Question 71

What do the muscular branches of the tibial nerve supply?

Answer 71

popliteus gastrocnemius soleus plantaris

Question 72

What does the popliteal branch of the tibial nerve become as id travels inferior?

Answer 72

interosseous nerve of the leg

Question 73

What information does the interosseous nerve of the leg carry?

Answer 73

sensory from the tibial periosteum | also from the ankle and tibiofibular joints

Question 74

In the leg, the tibial nerve gives rise to what sensory branches?

Answer 74

medial calcaneal branches

Question 75

What information does the medial calcaneal branches carry?

Answer 75

sensory for the skin over the medial heel

Question 76

The tibial nerve travels around the medial malleolus to what part of the foot?

Answer 76

dorsal plantar

Question 77

At the plantar portion of the foot, the tibial nerve terminates into which two nerves?

Answer 77

the medial plantar nerve and the lateral plantar nerve

Question 78

What muscles do the medial plantar nerves supply?

Answer 78

abductor hallicuces flexor digitorum brevis flexor hallucis brevis

Question 79

the medial plantar nerve divides into what secondary nerves?

Answer 79

common plantar digital nerves

Question 80

What do the common plantar nerves supply?

Answer 80

motor to lumbercals 1 &2 | sensory to skin between toes by way of the prober plantar digital nerves

Question 81

What two branches do the lateral plantar nerves split into?

Answer 81

superficial and deep branches

Question 82

What does the superficial branch of the lateral plantar nerves supply?

Answer 82

sensory to the skin around the 5th digit

Question 83

What does the deep branch of the lateral plantar nerves supply?

Answer 83

adductor allicuses flexor digiti minimi brevis lateral lumbercles interossei muscles

Question 84

What are the clinical considerations of the tibial nerve?

Answer 84

flexor paralysis hammer toes "claw foot"