Learning Point #1 (neuro-brachial plexus)

Question 1

From which spinal cord segments does the suprascapular nerve originate?

Answer 1

C6-C7

Question 2

From which spinal cord segments does the musculocutaneous nerve originate?

Answer 2

C6-C8

Question 3

From which spinal cord segments does the radial nerve originate?

Answer 3

C7-T2

Question 4

From which spinal cord segments do the median and ulnar nerves originate?

Answer 4

C8-T2

Question 5

From which spinal cord segments does the lateral thoracic nerve originate?

Answer 5

C8-T1

Question 6

From which spinal cord segments do the sympathetic nerves to the head and neck originate?

Answer 6

T1-T3

Question 7

From which spinal cord segments does the obturator nerve originate?

Answer 7

L4-L6

Question 8

From which spinal cord segments does the femoral nerve originate?

Answer 8

L4-L6

Question 9

From which spinal cord segments does the sciatic nerve originate?

Answer 9

L6-S2

Question 10

From which spinal cord segments does the peroneal nerve originate?

Answer 10

L6-S2

Question 11

From which spinal cord segments does the tibial nerve originate?

Answer 11

L6-S2

Question 12

Which muscles does the suprascapular nerve innervate?

Answer 12

SupraspinatusInfraspinatus

Question 13

Which muscles does the musculocutaneous nerve innervate?

Answer 13

Biceps brachiiBrachialis

Question 14

Which muscles does the radial nerve innervate?

Answer 14

Triceps brachiiExtensor carpi radialisDigital extensors

Question 15

Which muscles do the median and ulnar nerves innervate?

Answer 15

Superficial and deep digital flexorsCarpal flexors

Question 16

Which muscles does the lateral thoracic nerve innervate?

Answer 16

Cutaneous trunci

Question 17

Which muscles do the sympathetic nerves to the head and neck innervate?

Answer 17

Dilator of pupil

Question 18

Which muscles does the obturator nerve innervate?

Answer 18

PectineusGracilis

Question 19

Which muscles does the femoral nerve innervate?

Answer 19

Quadriceps groupPsoas group

Question 20

Which muscles does the sciatic nerve innervate?

Answer 20

Biceps femorisSemimembranosusSemitendinosusCranial tibialGastrocnemius

Question 21

Which muscles does the peroneal nerve innervate?

Answer 21

Cranial tibial

Question 22

Which muscles does the tibial nerve innervate?

Answer 22

Gastrocnemius

Question 23

Which reflexes are affected with dysfunction of the suprascapular nerve?

Answer 23

None

Question 24

Which reflexes are affected with dysfunction of the musculocutaneous nerve?

Answer 24

BicepsWithdrawal

Question 25

Which reflexes are affected with dysfunction of the radial nerve?

Answer 25

TricepsExtensor carpi radialis

Question 26

Which reflexes are affected with dysfunction of the median and ulnar nerves?

Answer 26

Withdrawal

Question 27

Which reflexes are affected with dysfunction of the lateral thoracic nerve?

Answer 27

Cutaneous trunci

Question 28

Which reflexes are affected with dysfunction of the sympathetic nerves to the head and the neck?

Answer 28

Pupillary light reflex

Question 29

Which reflexes are affected with dysfunction of the obturator nerve?

Answer 29

None

Question 30

Which reflexes are affected with dysfunction of the femoral nerve?

Answer 30

Patellar

Question 31

Which reflexes are affected with dysfunction of the sciatic nerve?

Answer 31

WithdrawalCranial tibialGastrocnemius

Question 32

Which reflexes are affected with dysfunction of the peroneal nerve?

Answer 32

Cranial tibial

Question 33

Which reflexes are affected with dysfunction of the tibial nerve?

Answer 33

Gastrocnemius

Question 34

What muscle function is lost with dysfunction of the suprascapular nerve?

Answer 34

Shoulder extension

Question 35

What muscle function is lost with dysfunction of the musculocutaneous nerve?

Answer 35

Elbow flexion

Question 36

What muscle function is lost with dysfunction of the radial nerve?

Answer 36

Elbow extensionCarpus extensionDigit extension

Question 37

What muscle function is lost with dysfunction of the median and ulnar nerves?

Answer 37

Carpus flexionDigit flexion

Question 38

What muscle function is lost with dysfunction of the lateral thoracic nerve?

Answer 38

Cutaneous trunci

Question 39

What muscle function is lost with dysfunction of the sympathetic nerves to the head and the neck?

Answer 39

Pupil dilation

Question 40

What muscle function is lost with dysfunction of the obturator nerve?

Answer 40

Hip adduction

Question 41

What muscle function is lost with dysfunction of the femoral nerve?

Answer 41

Stifle extensionHip flexion

Question 42

What muscle function is lost with dysfunction of the sciatic nerve?

Answer 42

Hip extensionStifle flexionHock flexion and extensionDigits flexion and extension

Question 43

What muscle function is lost with dysfunction of the peroneal nerve?

Answer 43

Hock flexionDigit extension

Question 44

What muscle function is lost with dysfunction of the tibial nerve?

Answer 44

Hock extensionDigit flexion

Question 45

What cutaneous sensation is lost with dysfunction of the suprascapular nerve?

Answer 45

Shoulder sensation

Question 46

What cutaneous sensation is lost with dysfunction of the musculocutaneous nerve?

Answer 46

Medial antebrachium and first digit sensation

Question 47

What cutaneous sensation is lost with dysfunction of the radial nerve?

Answer 47

Cranial antebrachium and foot sensation

Question 48

What cutaneous sensation is lost with dysfunction of the median and ulnar nerve?

Answer 48

Caudal antebrachium and foot Lateral aspect of 5th digit

Question 49

What cutaneous sensation is lost with dysfunction of the lateral thoracic nerve?

Answer 49

None

Question 50

What cutaneous sensation is lost with dysfunction of the sympathetic nerves of the head and the neck?

Answer 50

None

Question 51

What cutaneous sensation is lost with dysfunction of the obturator nerve?

Answer 51

None

Question 52

What cutaneous sensation is lost with dysfunction of the femoral nerve?

Answer 52

Medial surface of limb and first digit

Question 53

What cutaneous sensation is lost with dysfunction of the sciatic nerve?

Answer 53

Entire limb, except medial aspect and first digit

Question 54

What cutaneous sensation is lost with dysfunction of the peroneal nerve?

Answer 54

Craniolateral surface of limb, distal to stifle

Question 55

What cutaneous sensation is lost with dysfunction of the tibial nerve?

Answer 55

Caudal surface of limb, distal to stifle

Question 56

What signs of dysfunction are seen when the suprascapular nerve is affected?

Answer 56

Little/limited gait abnormality +/- shoulder abduction

Question 57

What signs of dysfunction are seen when the musculocutaneous nerve is affected?

Answer 57

Little/limited gait abnormality, weak elbow flexion

Question 58

What signs of dysfunction are seen when the radial nerve is affected?

Answer 58

Loss of weight bearing, knuckling

Question 59

What signs of dysfunction are seen when the median and ulnar nerves are affected?

Answer 59

Little/limited gait abnormality, mild carpus hyperextension

Question 60

What signs of dysfunction are seen when the lateral thoracic nerve is affected?

Answer 60

None

Question 61

What signs of dysfunction are seen when the sympathetic nerves to the head and the neck are affected?

Answer 61

Miosis (partial horners), ipsilateral peripheral vasodilation causing elevated skin temperature

Question 62

What signs of dysfunction are seen when the obturator nerve is affected?

Answer 62

Little/limited gait abnormality

Question 63

What signs of dysfunction are seen when the femoral nerve is affected?

Answer 63

Loss of weight bearing

Question 64

What signs of dysfunction are seen when the sciatic nerve is affected?

Answer 64

Knuckling of paws but weight bearing present

Question 65

What signs of dysfunction are seen when the peroneal nerve is affected?

Answer 65

Hyperextended hockKnuckled paw

Question 66

What signs of dysfunction are seen when the tibial nerve is affected?

Answer 66

Dropped hock