Nervous System

Question 0

Myotomes of brachial plexus

Answer 0

C5 - shoulder
C6 - elbow
C7 - wrist
C8 & T1 - fingers

Question 1

Brachial plexus

Answer 1

Innervation of the upper limb
C5-T1
Nerves = musculocutaneous, axillary, median, radial, ulnar

Question 2

Myotomes of lumbar plexus

Answer 2

L3 - hip

L4 - knee

Question 3

Myotomes of sacral plexus

Answer 3

L5 & S1 - ankle

Question 4

Rhyme for reflexes

Answer 4

S1-S2 buckle my shoe (Achilles tendon test)
L3-L4 kick the door (patellar tendon test)
C5-C6 pick up sticks (biceps brachii tendon test)
C7-C8 lay them straight (triceps brachii tendon test)

Question 5

A patient presents with weakness in the hand and loss of sensation on the front surface of the Palm on the ulnar side. Muscular testing reveals an inability to firmly hold a piece of paper between the fingers and a weak grip, especially on the ulnar side. The most likely cause would be a lesion to:

a) C8 and T1 spinal levels
b) musculocutaneous nerve at the elbow
c) ulnar nerve at the carpal tunnel
d) ulnar nerve in Guyon’s tunnel
e) ulnar nerve in the Cubital tunnel

Answer 5

e) ulnar nerve in the Cubital tunnel

Since Flexion of the fingers is caused by innervating muscles in the forearm, the lesion has to be at the elbow
Ulnar nerve provides motor and sensory to the ulnar side of forearm and hand

Question 6

Musculocutaneous nerve

Answer 6

Innervates muscles of the arm

Superficial cutaneous distribution of forearm

Question 7

Median nerve

Answer 7

Innervates muscles of the forearm - except flexor digitorium profundus
Superficial cutaneous distribution to medial of hand

Question 8

Ulnar nerve

Answer 8

Innervates the flexor digitorum profundus muscle

Superficial cutaneous distribution to the pinky and third finger

Question 10

deltoid (anterior fibers)

Answer 10

flexion & medial rotation

axillary nerve

Question 11

deltoid (middle fibers)

Answer 11

abduction

axillary nerve

Question 12

deltoid (posterior fibers)

Answer 12

extension & lateral rotation

axillary nerve

Question 13

supraspinatus

Answer 13

abduction

suprascapular nerve

Question 14

infraspinatus

Answer 14

lateral rotation

suprascapular nerve

Question 15

teres minor

Answer 15

extension & lateral rotation

axillary nerve

Question 16

subscapularis

Answer 16

medial rotation

subscapular nerve

Question 17

biceps

Answer 17

flexion

musculocutaneous nerve

Question 18

triceps

Answer 18

extension

radial nerve

Question 19

thenar group

Answer 19

thumb movement

median nerve

Question 20

lumbricals

Answer 20

finger abduction

median & ulnar nerves

Question 21

hypothenar group

Answer 21

pinky movement

ulnar nerve

Question 22

psoas

Answer 22

trunk flexion

L1-L4

Question 23

iliacus

Answer 23

thigh flexion
femoral nerve (L2-L3)

Question 24

gluteus maximus

Answer 24

extension & lateral rotation of hip

inferior gluteal nerve

Question 25

tensor fascia lata

Answer 25

thigh abduction & internal rotation | superior gluteal nerve

Question 26

deep external rotators (piriformis, obturator internus, superior & inferior gernelli)

Answer 26

hip abduction/adduction & external rotation | L5-S1

Question 27

quadriceps

Answer 27

knee extension | femoral nerve

Question 28

sartorius

Answer 28

thigh flexion, abduction & rotation | femoral nerve

Question 29

adductor group (adductor magnus, gracilis)

Answer 29

thigh adduction | obturator nerve

Question 30

popliteus

Answer 30

knee flexion & medial rotation | tibial nerve

Question 31

gastrocnemius & soleus

Answer 31

plantar flexion | tibial nerve

Question 32

tibialis posterior

Answer 32

plantar flexion & inversion | tibial nerve

Question 33

flexor digitorum

Answer 33

plantar flexion & toe flexion | tibial nerve

Question 34

tibialis anterior

Answer 34

dorsiflexion & inversion | fibular nerve

Question 35

extensor digitorum

Answer 35

dorsiflexion & toe extension | fibular nerve

Question 36

fibular group

Answer 36

dorsiflexion & eversion | fibular nerve

Question 37

flexor digitorum brevis

Answer 37

toe flexion | tibial nerve

Question 38

extensor digitorum brevis

Answer 38

toe extension | fibular nerve

Question 39

a patient eperiences loss of sensation in a stripe of skin along the medial aspect of the arm and forearm. This is accompanied by paresis of the finger adductors. The lesion would most likely be located in the: a) lower roots of the brachial plexus b) ulnar nerve c) median nerve d) posterior divisions of the brachial plexus e) upper roots of the brachial plexus

Answer 39

a) lower roots of the brachial plexus