Brachial Plexus

Question 1

Trunk of Brachial Plexus with Root value

Answer 1

Upper Trunk ~ C5, C6

Middle Trunk ~ C7

Lower Trunk ~ C8, T1

Question 2

Each trunk is divided into

Answer 2

Anterior and Posterior Divisions

Question 3

Lateral Cord is formed by

Answer 3

Anterior Divisions of Upper and Middle Trunk

Question 4

Anterior Division of Lower Trunk forms

Answer 4

Medial Cord

Question 5

All the posterior division join together and forms

Answer 5

Posterior Cord

Question 6

Root of the Brachial plexus is emerging between

Answer 6

Scalenus anterior and Scalenus medius

Question 7

Trunk of Brachial Plexus is located in

Answer 7

Posterior Triangle of Neck

Question 8

Divisions of Brachial Plexus are located

Answer 8

Before entering the Axilla

Question 9

Cords and Branches are located

Answer 9

In the Axilla

Question 10

Branches from Root of Brachial Plexus

Answer 10

C5 — Dorsal Scapular Nerve

C5, C6, C7 — Long Thoracic Nerve(Nerve of Bell)

Question 11

C5 — Dorsal Scapular Nerve Supplies

Answer 11

Rhomboid Major
Rhomboid Minor
Levator Scapulae

Question 12

Branches from the Upper Trunk of Brachial Plexus

Answer 12

Nerve to Subclavius > Suprascapular Nerve

Suprascapular Nerve as 1st branch of Upper Trunk but it frequently springs from the Ventral primary ramus of C5

Question 13

Branches from Medial Cord;

Five -

Answer 13

1. Medial pectoral nerve
2. Medial cutaneous nerve of arm
3. Medial cutaneous nerve of forearm
4. Ulnar nerve
5. Medial root of Median nerve

Question 14

Branches from Lateral Cord;

Three

Answer 14

1. Lateral pectoral nerve
2. Musculocutaneous nerve
3. Lateral root of Median nerve

Question 15

Lateral Pectoral Nerve Pierces ___________ Fascia

Answer 15

Clavipectoral Fascia

Question 16

Musculocutaneous nerve pierces

Answer 16

Coracobrachialis muscle

Question 17

Nerve of Anterior Compartment of Arm

Answer 17

Musculocutaneous nerve

Question 18

Muscles in Anterior Compartment of Arm

Answer 18

1. Coracobrachialis muscle
2. Brachialis muscle
3. Biceps

Supplied by Musculocutaneous nerve

Question 19

Muscle with Intracapsular origin;

In upper limb -

In lower limb -

Answer 19

In upper limb - Long head of biceps

In lower limb - Popliteus muscle

Question 20

After supplying the Anterior Compartment of Arm; Musculocutaneous nerve continues as →

Answer 20

Lateral cutaneous nerve of forearm

Question 21

Branches of Radial Nerve

Answer 21

Posterior cutaneous branch of arm

Posterior cutaneous branch of forearm

Lower lateral cutaneous nerve of arm

Question 22

Posterior cutaneous nerves of arm and forearm

Are branches of;

Answer 22

Radial nerve

Question 23

Medial cutaneous nerve of arm and forearm are branches of;

Answer 23

Medial cord of brachial plexus

Question 24

Upper lateral cutaneous nerve of arm; branch of

Answer 24

Axillary nerve

Question 25

Lateral cutaneous nerve of forearm; branch of

Answer 25

Musculocutaneous nerve

Question 26

Branches of Posterior Cord;

Answer 26

1. Upper subscapular nerve
2. Thoracodorsal nerve
3. Lower subscapular nerve
4. Axillary nerve
5. Radial nerve

Question 27

Upper subscapular nerve supplies

Answer 27

Upper part of subscapularis

Question 28

Thoracodorsal nerve supplies

Answer 28

Latissimus dorsi muscle

Question 29

Lower subscapular nerve supplies

Answer 29

Lower part of Subscapularis and Teres Mojor

Question 30

Axillary nerve supplies

Answer 30

Deltoid and Teres minor

Cutaneous branch - upper lateral cutaneous nerve of arm

Question 31

Humerus bone relation with 3 nerves are;

Neck of humerus -

Spiral groove of humerus -

Behind medial epicondyle -

Answer 31

Neck of humerus - Axillary

Spiral groove of humerus - Radial

Behind medial epicondyle - Ulnar

Question 32

Fracture at Neck of Humerus;

Nerve affected -

C/F -

Answer 32

Fracture at Neck of Humerus;

Nerve affected - Axillary nerve

C/F - Deltoid and Teres minor affected

Loss of sensation over the upper lateral aspect of the arm - Regimental badge anaesthesia

Question 33

Regimental badge anaesthesia is

Answer 33

Loss of sensation over the upper lateral aspect of the arm

Injury to Axillary nerve

Question 34

Largest branch of Brachial Plexus

Answer 34

Radial Nerve

Question 35

Nerve supply to Teres major

Answer 35

Lower Subscapular Nerve

Question 36

Nerve supply of Teres minor

Answer 36

Axillary nerve

Question 37

Erb’s point is

Answer 37

Meeting point of 6 nerves;

C5

C6

Suprascapular nerve

Nerve to Subclavius

Anterior division

Posterior division

Question 38

Causes of Erb’s palsy

Answer 38

1. Falling on outstretched hand

2. Obstetric complications

Question 39

Klumpke’s paralysis is due -

Cause -

Deformity -

Answer 39

Lower trunk injury - C8, T1

Cause - Hyperabduction injury

Deformity - Claw hand

Question 40

Nerves affected in Klumpke’s paralysis

Answer 40

C8, T1 —

Median nerve and Ulnar nerve

Muscle of Palm Paralysed

If T1 Sympathetic Fibres affected → Horner’s Syndrome

Question 41

Division of Brachial Plexus will not give any branch.

True / False

Answer 41

True

Question 42

Deformities seen in Erb’s Palsy

Should Joint -

Elbow Joint -

Forearm -

Answer 42

Should Joint - adducted and medially rotated

Elbow Joint - extended

Forearm - Pronated

Question 43

Nerves and Muscles affected in Erb’s Palsy

Answer 43

Suprascapular nerve

• Supraspinatus
• Infraspinatus

Radial Nerve

• Brachioradialis
• Extensor carpi radialis longus
• Supinator

Musculocutaneous Nerve

• Biceps
• Brachialis
• not affected ~ Coracobrachialis

Axillary Nerve

• Deltoid
• Teres minor

Nerve to Subclavius