Brachial Plexus

Question 1

What are the 3 TRUNKS of the brachial plexus

Answer 1

Upper
Middle
Lower

Question 2

Upper TRUNK of the brachial plexus is formed by:

Answer 2

C5 & C6

Question 3

Middle TRUNK of the brachial plexus is formed by:

Answer 3

C7 ALONE

Question 4

Lower TRUNK of the brachial plexus is formed by:

Answer 4

C8 & T1

Question 5

What are the DIVISIONS of the brachial plexus?

Answer 5

Anterior

Posterior

Question 6

What are the CORDS of the brachial plexus

Answer 6

Lateral
Medial
Posterior

Question 7

Form the fusion of the ANTERIOR division of the upper & middle trunks & contains fibers from:

Answer 7

C5, C6, & C7

Question 8

From the ANTERIOR division of the lower trunk and contains fibers from:

Answer 8

C8 & T1

Question 9

From the POSTERIOR division of ALL 3 trunks & contains fibers from

Answer 9

C5, C6, C7, C8 and T1

Question 10

Nerves directly from the Spinal Nerves:

Answer 10

• Dorsal Scapular

- Long Thoracic

Question 11

Nerves from the UPPER trunk:

Answer 11

• Suprascapular

- Nerve to the subclavius

Question 12

Nerves from the Lateral cord:

Answer 12

• Lateral pectoral
• Musculocutaneous
• Part of the median

Question 13

Nerves from the MEDIAL cord

Answer 13

• Medial pectoral
• Medial brachial cutaneous
• Medial antebrachial cutaneous
• Ulnar
• Part of the Median

Question 14

Nerves from the POSTERIOR cord:

Answer 14

• Upper & lower subscapular
• Thoracodorsal
• Axillary
• Radial

Question 15

Dorsal Scapular Nerve:
Segmental innervation
Motor Supply
Articular supply

Answer 15

Segmental Innervation: C5
Motor supply: Rhomboid major/minor, Levator Scapula
Articular Supply: Acromicoclavicular Joint

Question 16

Long Thoracic Nerve:
Segmental supply
Motor supply

Answer 16

Segmental Innervation: C5, C6 & C7

Motor Supply: Serratus Anterior

Question 17

Suprascapular Nerve:
Segmental supply
Motor supply
Articular supply

Answer 17

Segmental Supply: C5 & C6
Motor Supply: Supraspinatus & infraspinatus
Articular Supply: Shoulder joint

Question 18

Nerve to the Subclavius:
Segmental supply
Motor supply
Articular supply

Answer 18

Segmental Innervation: C5 & C6
Motor Supply: Subclavius
Articular Supply: Sternoclavicular joint

Question 19

Lateral pectoral Nerve
Segmental innervation
Motor supply

Answer 19

Segmental Innervation: C5, C6 & C7

Motor Supply: Pectoralis Major

Question 20

Musculocutaneous Nerve:
Segmental inn. 
Motor supply
Articular supply 
Cutaneous supply

Answer 20

Segmental innervation: C5, C6 & C7
Motor Supply: Coracobrachialis, Biceps Brachii, & Brachialis
Articular Supply: Elbow Joint
Cutaneous Supply: Lateral Aspect go the forearm

Question 21

Medial Pectoral Nerve:
Segmental innervation
Motor supply

Answer 21

Segmental Innervation: C8 & T1

Motor Supply: Pectoral Major & minor

Question 22

Medial Brachial Cutaneous Nerve:
Segmental innervation
Cutaneous supply

Answer 22

Segmental Innervation: T1 ONLY

Cutaneous Supply: Medial aspect of the arm

Question 23

Medial Antebrachial Cutaneous Nerve:
Segmental innervation
Cutaneous supply

Answer 23

Segmental Innervation: C8 & T1

Cutaneous Supply: Medial aspect of the forearm

Question 24

Ulnar Nerve:
Segmental innervation
Motor supply
Articular supply 
Cutaneous supply

Answer 24

Segmental Innervation: C8 & T1
Motor supply: Flexor Carpi Ulnaris, 1/2 of Flexor digitorum profundus, Hypothenar muscles
Articular Supply: Elbow & wrist joint
Cutaneous supply: Medial aspect of the palm, Dorsum of the hand, Skin of digits 5, and part of digit 4

Question 25

``` Median Nerve: Segmental innervation Motor supply Articular supply Cutaneous supply ```

Answer 25

Segmental Innervation: C6, C7, C8 & T1 Motor supply: Most of the muscles of the anterior forearm Articular Supply: Elbow & wrist joint Cutaneous Supply: Lateral 3/4 of the palmar surface of the hand & skin of the 1st 3 1/2 digits

Question 26

Upper subscapular Nerve: Segmental supply Motor supply

Answer 26

Segmental Innervation: C5 | Motor Supply: Subscapularis

Question 27

Lower Subscapular Nerve: Segmental innervation Motor supply

Answer 27

Segmental Innervation: C6 | Motor Supply: Subscapularis & Teres Major

Question 28

Thoracodorsal Nerve: Segmental innervation Motor supply

Answer 28

Segmental Innervation: C6, C7 & C8 | Motor Supply: Latissimus Dorsi

Question 29

``` Axillary Nerve: Segmental innervation Motor supply Articular supply Cutaneous supply ```

Answer 29

Segmental Innervation: C5 & C6 Motor Supply: Deltoid & Teres Minor Articular Supply: Shoulder joint Cutaneous Supply: Lateral aspect of the ARM

Question 30

``` Radial Nerve: Segmental innervation Motor supply Articular supply Cutaneous supply ```

Answer 30

Segmental Innervation: C5, C6, C7, C8 & T1 Motor Supply: Triceps brachii, Anconeus, all of the posterior forearm muscles Articular Supply: Elbow & wrist joint Cutaneous Supply: Most of the posterior arm & forearm; dorsum of the hand ( not supplied by the median & ulnar nerves

Question 31

Plexus in which C4 is the most superior spinal nerve root forming the plexus. In this type of plexus, C8 would be the most inferior spinal nerve root

Answer 31

Prefixed Brachial Plexus

Question 32

Plexus in which C6 is the most superior spinal nerve root forming the plexus. In this type of plexus, T2 would be the most inferior spinal nerve root

Answer 32

Postfixed Brachial Plexus