brachial plexus

Question 1

Dorsal Scapular nerve (function and nerve roots)

Answer 1

Nerve Root = C5

Innervates:

• Levator Scapulae
• Rhomboid Major
• Rhomboid Minor

Question 2

Suprascapular nerve (function and nerve roots)

Answer 2

Nerve Root = C5 and C6

Innervates:

• Supraspinatus
• Infraspinatus

Question 3

Musculocutaneous nerve

Answer 3

Nerve Roots = C5, C6 and C7 (terminal branch of LATERAL cord)

Innervates :
Biceps Brachii
Coracobrachialis
Brachialis

Question 4

Median nerve

Answer 4

Nerve Roots = C6, C7, C8 and T1
(Terminal branch, has contribution from Lateral and Median cords)

Innervates:

• Pronator Teres
• Flexor carpi radialis
• Palmaris longus
• Flexor digitorum superficialis
• Anterior interosseous (branch of median) supplies:
• Lateral 1/2 of flexor digitorum profundus
• pronator quadratus
• flexor pollicis longus
• Recurrent median nerve branch supplies thenar muscles:
• Abductor pollicis brevis
• Flexor pollicis brevis
• Opponens pollicis

Question 5

Lateral Pectoral nerve

Answer 5

Nerve Roots = C5, C6 and C7 (branch from lateral cord)

Innervates:
-Pectoralis Major

Question 6

Upper / superior / short Subscapular nerve

Answer 6

Nerve Roots = C5

Innervates:
-Subscapular

Question 7

Thoracodorsal nerve

Answer 7

Nerve Roots = C6, C7 and C8

Innervates = Latissimus Dorsi

Question 8

Lower / inferior subscapular

Answer 8

Nerve Roots = C6

Innervates :

• Subscapular
• Teres Major

Question 9

Axillary nerve

Answer 9

Nerve Roots = C5 and C6
*terminal branch of posterior cord

Innervates :

• Teres Minor
• Deltoid

Question 10

Radial nerve

Answer 10

Nerve Roots = C5, C6, C7 , C8 and T1
*Terminal branch of posterior cord

Innervates:

• Triceps Brachii (lateral and medial heads)
• Brachioradialis
• anconeus
• Extensor Carpi Radialis Longus

deep branch of radial nerve:

• Extensor carpi radialis brevis
• Supinator

Posterior Interosseous:

• Extensor digitorum communis
• Extensor digiti minimi
• Extensor carpi ulnaris
• abductor pollicis longus
• extensor pollicis brevis
• extensor pollicis longus
• extensor indices

Question 11

Medial Pectoral nerve

Answer 11

nerve roots = C8 and T1

Innervates :

• Pectoralis Minor
• Pectoralis Major

Question 12

Ulnar nerve

Answer 12

Nerve Roots = C8 and T1

Innervates:

• flexor carpi ulnaris
• (medial half of) flexor digitorum profundus

Deep branch of ulnar:

• 3rd and 4th Lumbricals
• Opponens digiti minimi
• flexor digiti minimi
• abductor digiti minimi
• adductor pollicis
• Interossei

Question 13

Long thoracic nerve

Answer 13

Nerve Roots = C5, C6, C7 and C8

Innervates = Serratus Anterior