Major branches of the brachial plexus

Question 1

How many major branches stem from the 3 cords of the brachial plexus (lateral, posterior and medial)?

Answer 1

5

Question 2

Musculocutaneous nerve
Roots:
Motor functions:
Sensory functions:
Damage:

Answer 2

Roots: C5, 6 and 7
Motor functions: innervates the brachialis, biceps brachii and coracobrachialis muscles
Sensory functions: lateral cutaneous branch innervates lateral half of ant forearm
Damage: (flexion at shoulder weak) (supination at forearm weak) (loss of sensation to lat forearm)

Question 3

Axillary nerve
Roots:
Motor functions:
Sensory functions:
Damage:

Answer 3

Roots: C5, 6
Motor functions: teres minor + deltoid muscles
Sensory functions: superior lat cutaneous nerve of arm -> innervates inf deltoid
Damage: ?

Question 4

Median nerve
Roots:
Motor functions:
Sensory functions:
Damage:

Answer 4

Roots: C6->T1
Motor functions: innervates most of flexor muscles in forearm, thenar muscles and 2 lumbricals of index + middle fingers
Sensory functions: lat palm and lat 3.5 fingers of palmar surface of hand
Damage: hand of benediction

Question 5

Radial nerve
Roots:
Motor functions:
Sensory functions:
Damage:

Answer 5

Roots: C5- T1
Motor functions: triceps brachii + posterior compartment forearm (extensors of wrist and fingers)
Sensory functions: post aspect of arm and forearm + posterolateral hand
Damage:

Question 6

Ulnar nerve
Roots:
Motor functions:
Sensory functions:
Damage:

Answer 6

Roots: C8 and T1
Motor functions: most of muscles of the hand (except thenar) +some in fingers
Sensory functions: anterior and posterior of medial 1.5 fingers + associated palm
Damage: