Neuro 9 Major Plexuses And Peripheral Nerves

Front 1

which muscles are innervated by the musculocutaneous nerve?

Back 1

BBC (biceps, brachialis, coracobrachialis)

Front 2

lumbosacral plexus

Back 2

L1-S4

Front 3

what are the motor functions of the radial nerve?

Back 3

extension at all arm, wrist, and finger joints, forearm supination, thumb abduction in plane of palm

Front 4

what are the motor functions of the median nerve?

Back 4

thumb flexion and opposition, flexion of digits 2 and 3, wrist flexion and abduction, forearm pronation

Front 5

what are the motor functions of the ulnar nerve?

Back 5

finger adduction and abduction other than thumb, thumb adduction, flexion of digits 4 and 5, wrist flexion and adduction

Front 6

what is the function of the axillary nerve?

Back 6

abduction of arm at shoulder beyond first 15°

Front 7

what is the function of the musculocutaneous nerve?

Back 7

flexion of arm at elbow, supination of forearm

Front 8

sensory innervation of saphenous nerve

Back 8

medial shin

Front 9

sensory innervation of common peroneal nerve

Back 9

lateral upper half of shin

Front 10

sensory innervation of deep peroneal nerve

Back 10

b/w 1st and 2nd toes

Front 11

sensory innervation of superficial peroneal

Back 11

lower lateral half of shin

Front 12

sensory innervation of posterior tibial nerve

Back 12

lateral foot and sole

Front 13

what are the intrinsic hand muscles?

Back 13

muscles of the thenar and hypothenar eminence, lumbricals, and interossei

Front 14

what nerves and nerve roots innervate the intrinsic hand muscles?

Back 14

ulnar nerve, except for the LOAF muscles which are innervated by the median nerve; C8, T1

Front 15

function of the palmar interossei

Back 15

adduct the fingers

Front 16

function of the dorsal interossei

Back 16

abduct the fingers

Front 17

which muscles are innervated by the sciatic nerve?

Back 17

hamstring muscles (semitendinosus, semimembranosus, biceps femoris)

Front 18

Erb-Duchenne Palsy

Back 18

damage to the upper trunk of the brachial plexus causes weakness of the deltoid, biceps, infraspinatus, and wrist extensors (C5, C6); arm assumes "bellman's" or "waiter's tip" pose

Front 19

what causes Erb-Duchenne Palsy?

Back 19

traction on infant's shoulder during delivery and motorcycle accidents

Front 20

Klumpke's Palsy

Back 20

damage to the lower trunk of the brachial plexus causes hand and finger extension weakness, atrophy of the hypothenar muscles, and sensory loss on the ulnar aspect of the hand and forearm

Front 21

what causes Klumpke's Palsy?

Back 21

upward traction produced by grabbing a branch during fall from a tree, thoracic outlet syndrome, and Pancoast's syndrome

Front 22

thoracic outlet syndrome

Back 22

lower brachial plexus is compressed as it passes b/w the clavicle and 1st rib

Front 23

Pancoast's syndrome

Back 23

apical lung tumor (non-small cell carcinoma) extends into the lower brachial plexus

Front 24

what causes radial neuropathy?

Back 24

sleeping with the arm slung over a park bench ("Saturday night palsy"), compression in the axilla by crutches

Front 25

signs of radial neuropathy?

Back 25

wrist drop (weakness of all extensors of the arm hand, and fingers below the shoulder), loss of triceps reflex

Front 26

what causes median neuropathy?

Back 26

someone sleeping with their head resting on the upper arm ("honeymooner's palsy")

Front 27

which nerve passes through the pronator teres muscle in the forearm?

Back 27

median

Front 28

signs of median neuropathy?

Back 28

preacher's hand (unable to flex first 3 digits when trying to make a fist)

Front 29

what is the best muscle to test carpal tunnel syndrome?

Back 29

abductor pollicis brevis, which abducts the thumb perpendicular to the plane of the palm

Front 30

signs of femoral neuropathy?

Back 30

weakness of thigh flexion and knee extension, loss of patellar reflex, and sensory loss in anterior thigh

Front 31

signs of sciatic neuropathy?

Back 31

weakness of all foot and ankle muscles and of knee flexion, loss of Achilles reflex, and sensory loss in the foot and lateral leg below the knee

Front 32

where is the common peroneal nerve vulnerable to injury?

Back 32

as it passes around the fibular head

Front 33

signs of peroneal nerve palsy?

Back 33

foot drop with weakness of foot dorsiflexion and eversion, and sensory loss over the dorsolateral foot and shin

Front 34

meralgia paresthetica

Back 34

lateral femoral cutaneous nerve (L2,L3) can be entrapped as it passes under the inguinal ligament or fascia lata producing paresthesias and loss of sensation in the lateral thigh

Front 35

Morton's metatarsalgia

Back 35

tight-fitting shoes can compress the nerves of the 3rd and 4th toes, producing numbness and paresthesias

Front 36

what will you see in a nerve conduction study with a lesion proximal to the dorsal root ganglia?

Back 36

SNAPs will be preserved

Front 37

what will you see in a nerve conduction study with a lesion proximal to motor nerve roots?

Back 37

reduced or absent CMAPs

Front 38

decreased SNAP amplitude indicates

Back 38

axonal damage