Brachial Plexus

Question 1

Origin of Brachial Plexus

Answer 1

Anterior rami of spinal nerves c5 c6 c7 c8 t1

Question 2

Order from inside the neck

Answer 2

rootlets, roots, spinal nerves, rami

Question 3

Order from outside the neck

Answer 3

roots, trunks, divisions, chords, branches

Question 4

Trunks

Answer 4

Upper, middle, lower

Question 5

Divisions

Answer 5

anterior and posterior divisions from each upper middle and lower trunk

Question 6

Lateral Cord origin

Answer 6

Anterior divisions from upper and middle trunks

Question 7

Posterior Cord origin

Answer 7

Posterior divisions of all 3 trunks

Question 8

Medial Cord origin

Answer 8

anterior division of lower trunk

Question 9

Upper trunk origin

Answer 9

C5 and C6

Question 10

Middle trunk origin

Answer 10

C7

Question 11

Lower trunk origin

Answer 11

C8 and T1

Question 12

2 Branches from the “roots” of the brachial plexus

Answer 12

Dorsal Scapular Nerve (C5)

• Levator Scapulae
• Rhomboids Major and Minor

Long Thoracic Nerve (C5-7)
- Serratus anterior

Question 13

2 branches from “trunks” of the brachial plexus

Answer 13

Suprascapular Nerve (C5, C6)

• Supraspinatus
• Infraspinatus

Nerve to Subclavius (C5, C6)
- Subclavius

*upper trunk

Question 14

3 Branches from the “lateral cord” of the BP

Answer 14

Lateral Pectoral Nerve
- Pectoralis Major and Minor

Musculocutaneous Nerve

• Biceps Brachii
• Bachialis
• Coracobrachialis

Median Nerve

• Anterior Forearm**
• Hand

Question 15

5 Braches from the “medial cord” of the BP

Answer 15

Medial Pectoral Nerve
- Pectoralis Major and Minor

Medial Cutaneous Nerves of arm/forearm (2 branches)

Ulnar Nerve

• Anterior Forearm
• Hand **

Median Nerve

• Anterior Forearm **
• Hand

Question 16

Posterior Cord travels

Answer 16

Behind Axillary Artery

Question 17

5 branches from the posterior cord of the BP

Answer 17

Axillary Nerve

• Deltoid
• Teres Minor

Radial Nerve
- Extensors of upper limb

Thoracodorsal Nerve
- Latissimus Dorsi

Upper Subscapular Nerve (before Thor. N.)
- Subscapularis

Lower Subscapular Nerve (after Thor. N.)

• Subscapularis
• Teres Major

Question 18

Anterior Arm innervation

Answer 18

Musculocutaneous

Question 19

Posterior arm innervation

Answer 19

radial nerve

Question 20

Anterior forearm innervation

Answer 20

median nerve **

ulnar nerve

Question 21

Hand Innervation

Answer 21

Ulnar nerve **

median nerve

Question 22

Posterior forearm

Answer 22

Radial Nerve