UL Concept E

Question 1

Name the 5 segments of brachial plexus from proximal to distal

Answer 1

Roots 
Trunks
Divisions 
Cords
Terminal branches

Question 2

Which vertebral nerves do brachial plexus stem from?

Answer 2

C5-T1

C5, C6, C7, C8, T1

Question 3

What are terminal branches?

Answer 3

*Named nerves traveling to and from upper limb structures

Question 4

Which trunk is from C5+C6?

Answer 4

Superior trunk

Question 5

Which trunk is from C8+T1?

Answer 5

Inferior trunk

Question 6

Which trunk is a continuation of C7?

Answer 6

Middle trunk

Question 7

What muscles do the axillary nerve innervate?

Answer 7

Deltoid

Teres minor

Question 8

If axillary nerve is damaged, what is the result?

Answer 8

Decreased ability to abduct the arm

Overall weakness in shoulder movement

Question 9

Cutaneous innervation of axillary nerve is?

Answer 9

Superolateral arm superficial to deltoid muscle

Question 10

What is the origin of axillary nerve?

Answer 10

Posterior cord

Question 11

What is the path of axillary nerve?

Answer 11

Passes posterior to surgical neck of humerus

Question 12

What does radial nerve innervate?

Answer 12

All posterior compartments of arm and forearm

Question 13

Cutaneous innervation of radial nerve?

Answer 13

Areas of posterior arm, posterior forearm, posterior hand & lateral 3.5 digits (except distal tips)

Question 14

What is the origin of radial nerve?

Answer 14

Posterior cord

Question 15

Path of radial nerve?

Answer 15

Passes posterior to the humerus within radial groove

Question 16

Injury of radial nerve causes?

Answer 16

Decreased ability to perform extension at elbow wrist and digits

Question 17

Musculocutaneous nerve innervates?

Answer 17

ALL anterior arm

Question 18

Musculocutaneous nerve innervates all of the anterior arm, but it’s cutaneous innervation is to…

Answer 18

The lateral forearm

Question 19

What is the origin of musculocutaneous nerve?

Answer 19

Lateral cord

Question 20

What is the path of musculocutaneous nerve?

Answer 20

Pierces coracobrachialis muscle

Courses deep to biceps brachii muscle

Question 21

Damage to musculocutaneous m. causes?

Answer 21

Decreased ability to flex at elbow and supinate at elbow

Question 22

Median nerve innervates anterior forearm. But what does it NOT innervate?

Answer 22

Flexor carpi ulnaris

Medial 1/2 of flexor digitorum profundus m.

Question 23

Medial nerve innervates anterior forearm (except FCU & 1/2 FDP) AND what muscles of the hand?

Answer 23

Thenar (moves thumb)

Question 24

What does median nerve cutaneously innervate?

Answer 24

Lateral 3.5 digits and associated palm

Posterior tips of same fingers

Question 25

Origin of median nerve?

Answer 25

Lateral and medial cords

Question 26

What is the path of median nerve?

Answer 26

Passes through cuboidal fossa | Passes through carpal tunnel at wrist

Question 27

Injury of median nerve?

Answer 27

Carpal tunnel syndrome Weakness in hand grip & opposition of thumb Abnormal sensation in lateral 3.5 digits