Lecture18: Brachial Plexus

Question 1

What is the origin of the lateral cord?

Answer 1

Anterior cords of upper and middle trunks

Question 2

What is the origin of the medial cord?

Answer 2

Anterior cord of lower trunk

Question 3

What does the Dorsal Scapular nerve of C5 supply?

Answer 3

Rhomboids

Question 4

What does the long thoracic nerve of the C5,6, and 7 supply?

Answer 4

Serratus anterior

Question 5

What do both suprascapular nerve and the nerve to subclavius arise from? Which trunk

Answer 5

Upper trunk ( C5,6 )

Question 6

What cord does the Ulnar nerve arise from?

Answer 6

Medial cord

Question 7

What cord does the Musculocutaneous nerve arise from?

Answer 7

Lateral cord ( C5,6,7)

Question 8

What cord do both axillary and and radial nerves arise from?

Answer 8

Posterior cord

Question 9

What cord does the nerve to latissmuss dorsi arise from?

Answer 9

Posterior cord

Question 10

What does the axillary nerve supply?

Answer 10

The delts (deltoid)

Question 11

What muscles do the musculocutaneous nerves supply?

Answer 11

All the muscles of the front of the arm

Question 12

What muscles does the ulnar nerve supply?

Answer 12

Medial side of the front of the forearm and hand muscles, but not thumb

Question 13

What muscles does the medial nerve supply?

Answer 13

Front of forearm, thumb muscles

Question 14

What does the radial nerve supply?

Answer 14

Muscles of the arm and back

Question 15

What cord do both subscapular nerves arise from?

Answer 15

Posterior cord

Question 16

What does a motor deficit of the radial nerve lead to?

Answer 16

Wrist drop

Question 17

What does motor deficit of the median nerve lead to?

Answer 17

Ape hand (unable to grasp objects)

Question 18

What does motor deficit of the ulnar nerve lead to?

Answer 18

Claw hand (unable to spread fingers)

Question 19

Which triangle of the neck are roots and trunks found?

Answer 19

Posterior triangle

Question 20

Where are chords and branches found?

Answer 20

In the axillary