Brachial Plexus

Question 1

What is the brachial plexus?

Answer 1

Conjugation of nervous tissue comprised of fibres formed by the ventral rami of C5, C6, C7, C8 and T1.
It provides motor and sensory innervation for the entire upper limb.

Question 2

Name the roots of the brachial plexus.

Answer 2

C5, C6, C7, C8 and T1

Question 3

Name the trunks of the brachial plexus.

Answer 3

Superior
Middle
Inferior

Question 4

Name the cords of the brachial plexus.

Answer 4

Lateral
Posterior
Medial

Question 5

Name the branches of the brachial plexus.

Answer 5

Musculocutaneous
Axillary
Median
Radial
Ulnar

Question 6

Draw the brachial plexus!

Answer 6

:)

Question 7

Musculocutaneous nerve roots?

Answer 7

C5
C6
C7

Question 8

Musculocutaneous nerve motor function?

Answer 8

Innervates the brachialis, biceps brachii and corocobrachialis muscles

Question 9

Musculocutaneous nerve sensory function?

Answer 9

The lateral cutaneous branch comes off it.

This innervates lateral half of anterior forearm, and a small portion of posterior forearm

Question 10

Axillary nerve roots?

Answer 10

C5

C6

Question 11

Axillary nerve motor function?

Answer 11

Innervates the deltoid, teres minor and long head of the triceps brachii

Question 12

Axillary nerve sensory function?

Answer 12

Superior lateral cutaneous nerve of arm comes off it.

This innervates the inferior region of the deltoid.

Question 13

Radial nerve roots?

Answer 13

C5 - C8

T1

Question 14

Radial nerve motor functions?

Answer 14

Innervates triceps brachii and the extensor muscles in posterior compartment of forearm

Question 15

Radial nerve sensory functions?

Answer 15

Innervates posterior aspect of arm and forearm.

And posterior, lateral aspect of hand

Question 16

Ulnar nerve roots?

Answer 16

C8

T1

Question 17

Ulnar nerve motor functions?

Answer 17

Innervates muscles of hand (not thenar muscles or two lateral lumbricals)

Flexor carpi ulnaris and medial half of flexor digitorum profundus

Question 18

Ulnar nerve sensory functions?

Answer 18

Innervates anterior and posterior surfaces of the medial one and half fingers
And associated palm area

Question 19

Median nerve roots?

Answer 19

C6-C8

T1

Question 20

Median nerve motor function?

Answer 20

Innervates most of flexor muscles in forearm, the thenar muscles, the two lateral lumbrical muscles (that move the index and middle fingers)

Question 21

Median nerve sensory function?

Answer 21

Palmar cutaneous branch comes off it.
This innervates the lateral part of the palm

The digital cutaneous branch comes off it too.
This innervates the lateral three and a half fingers on the anterior palmar surface of the hand