Neurology of the upper limb

Question 1

Point out which dermatome innervates which area

Answer 1

ref. notes

Question 2

which nerve is responsible for which movement of upper limb: abduction of arm, flexion of finger, adduction finger, flexion+extension elbow

Answer 2

abduction of arm,=C5
flexion of finger=C7,8
adduction finger=t1
flexion+extension elbow=C5,6 flex c6-8 extend

Question 3

Where does the brachial plexus lie

Answer 3

Through the cervicoaxillary canal and axillary fossa

through scalene, below pec minor, above subscapulariss

Question 4

what are the roots of the brachial plexus, draw out the brachial plexus

Answer 4

C5-T1

ref. notes

Question 5

What does the dorsal scapular nerve do and where are its roots

Answer 5

innervates rhomboids and levator scapulae

root=C4, C5 pierces middle scalene

Question 6

What does the long thoracic nerve do and where are its roots

Answer 6

innervates serratus anterior
root=C5, C6, C7. C5+6 pierce middle scalene, C7 passes in front of muscle. Descends posterior to axillary artery and vein alongside of thorax

Question 7

What does damage to the Long thoracic nerve cause

Answer 7

winged scapula

Question 8

Where does the brachial plexus lie

Answer 8

Through the cervicoaxillary canal and axillary fossa

through scalene, below pec minor, above subscapulariss

Question 9

what are the roots of the brachial plexus, draw out the brachial plexus

Answer 9

C5-T1

ref. notes

Question 10

What does the dorsal scapular nerve do and where are its roots

Answer 10

innervates rhomboids and levator scapulae

root=C4, C5 pierces middle scalene

Question 11

what does the axillary nerve do and where are its roots

Answer 11

innervates teres minor, deltoid, glenohumeral joint, skin over inferior deltoid
exits axilla through quadrangular space with posterior circumflex humeral artery
gives rise to superior lateral brachial cutaneous nerve, then winds around surgical neck of humerus
c5, c6

Question 12

what does the musculocutaneous nerve do and where are its roots

Answer 12

Innervates muscles of the anterior arm (flexor compartment: biceps brachii, coracobrachialis, brachialis), with a branch to the humerus (nutrient foramen), and continues as lateral cutaneous nerve of the forearm
C5-C7

Question 13

What does suprascapular nerve innervate and where are its roots

Answer 13

innervates glenohumeral joint, infraspinaturs, supraspinatus

c4-c6

Question 14

what does the lateral pectoral nerve do and where are its roots

Answer 14

Innervates pec major and minor

C5-C7

Question 15

what does the ulnar nerve do and where are its roots

Answer 15

Innervates 1 ½ muscles of the anterior forearm (flexor compartment): flexor carpi ulnaris & flexor digitorum profundis, and multiple muscles of the hand
Sensory innervation of lateral palm of hand and 1 ½ digits
C8, T1

Question 16

what does theaxillary nerve do and where are its roots

Answer 16

innervates teres minor, deltoid, glenohumeral joint, skin over inferior deltoid

Question 17

what does the musculocutaneous nerve do and where are its roots

Answer 17

Innervates muscles of the anterior arm (flexor compartment: biceps brachii, coracobrachialis, brachialis), with a branch to the humerus (nutrient foramen), and continues as lateral cutaneous nerve of the forearm
C5-C7

Question 18

what does the median nerve do and where are its roots

Answer 18

Innervates muscles of the anterior forearm (flexor compartment) with two exceptions, thenar eminence and lumbricals of the hand
Sensory innervation of medial palm of hand and 3 ½ digits
C6, C7, C8, T1

Question 19

what ligament does the median nerve go under in the carpal tunnel

Answer 19

transverse carpal lig.

Question 20

what does the ulnar nerve do and where are its roots

Answer 20

Innervates 1 ½ muscles of the anterior forearm (flexor compartment): flexor carpi ulnaris & flexor digitorum profundis, and multiple muscles of the hand
Sensory innervation of lateral palm of hand and 1 ½ digits
C8, T1

Question 21

what does the radial nerve do and where are its roots

Answer 21

Innervates posterior (extensor) compartment of arm and forearm
C5-C8 and T1

Question 22

what does damage to the radial nerve do

Answer 22

Saturday night palsy, ‘Honeymoon palsy’, Wrist drop, Wartenberg syndrome

Question 23

what does damage to the ulnar nerve do

Answer 23

mallet fingers

Question 24

what does damage to the median nerve do

Answer 24

carpal tunnel syndrome