Brachial plexus - Part 3

Question 1

The ulnar nerve travels deep to the flexor carpi ulnaris, passes __________ to the _________ and then divides into two branches.

Answer 1

Superficial **

Flexor retinaculum**

Question 2

Once pass the flexor retinaculum, the ulnar nerve divides into which two branches?

Answer 2

Superficial and deep

Question 3

The superficial branches of the ulnar nerve divides into three terminal branches called what?

Answer 3

Proper palmar branches

Question 4

The proper palmar branches supply what?

Answer 4

Palmar aspect of the little finger and

Medial half of the ring finger

Question 5

The deep branch of the ulnar nerve curves towards what in the hand?

Answer 5

Thenar eminence

Question 6

The deep branch of the ulnar nerve gives off branches in the hand to supply what muscles? (7)

Answer 6

Abductor digiti minimi
Flexor digiti minimi brevis
Opponent digiti Minami
Adjustor policies
Deep head of the flexor pollicis brevis
All interossei (dorsal and palmar)
Lumbricals (3 and 4)

Question 7

Damage to the ulnar nerve can cause what?

Answer 7

Claw hand (aka ape hand)
(atrophy thenar muscles too)

Question 8

Claw hand involves all digits. Why?

Answer 8

Because ulnar innervates ALL interossei muscles

Question 9

What are the five possible crush injuries sites?

Answer 9

IVF
Scalene triangle
Brachial plexus
Posterior medial epicondyle (elbow)
Flexor retinaculum

Question 10

The median nerve contains fibers from what two cords?

Answer 10

Medial and lateral cords

Question 11

The median nerve contains fibers from what nerves?

Answer 11

C6, C7, C8, and T1

Question 12

Does the median nerve give off branches in the arm?

Answer 12

No

Question 13

The median nerve travels through the arm in what?

Answer 13

Medial bicipital sulcus

Question 14

The median nerve crosses the elbow on which side?

Answer 14

Anterior side

Question 15

The median nerve enters the forearm after passing through what?

Answer 15

Two heads of the pronator teres

Question 16

The median nerve innervates what muscles of the forearm?

Answer 16

Pronator teres
Flexor carpi radialis
Palmaris longus
Flexor digitorum superficialis

Question 17

The other three muscles of the forearm that the median nerve innervates is by way of what nerve? Given off where?

Answer 17

Anterior interosseous nerve of the forearm

At the elbow

Question 18

What muscles does the anterior interosseous nerve of the forearm supply?

Answer 18

Pronator quadratus
Flexor pollicis longus
Lateral bellies of flexor digitorum profundus

Question 19

What branch of the median nerve is given off in the distal third of the forearm?

Answer 19

Palmar branch of the median nerve

Question 20

The palmar branch of the median nerve supplies what?

Answer 20

Skin of the thenar eminence, lateral wrist, and palm

Question 21

The median nerve passes through what near the wrist?

Answer 21

Carpal tunnel

Question 22

After passing through the carpal tunnel, the median nerve divides into what?

Answer 22

Common palmar digital nerves

Question 23

The common palmar digital nerves supply what?

Answer 23

1st two lumbricals

Question 24

The 1st common palmer digital nerve supplies what?

Answer 24

(thenar muscles)
Abductor pollicis brevis
Flexor pollicis brevis - superficial head
Opponent pollicis

Question 25

Each common palmar digital nerve splits into what?

Answer 25

Proper palmar digital nerves

Question 26

Are the proper palmar digital nerves motor or sensory?

Answer 26

sensory

Question 27

The proper palmar digital nerves supply what?

Answer 27

Skin over lateral three and a half digits

Question 28

The median nerve also supplies what that is loaded with nociceptors?

Answer 28

periosteum

Question 29

What is the articular supply of the median nerve?

Answer 29

Elbow, radiocarpal, and midcarpal joints

Question 30

The median nerve usually communicates with which nerve at the wrist?

Answer 30

Ulnar nerve

Question 31

What are some things that can happen with damage to the median nerve?

Answer 31

hand of oath/benediction Carpal tunnel syndrome Unable to pronate

Question 32

Why would the median nerve make you unable to pronate?

Answer 32

Because it innervates the pronator teres and pronator quadratus

Question 33

Carpal tunnel syndrome is entrapment where?

Answer 33

Flexor retinaculum and carpal bones

Question 34

What is the "hand of oath/benediction"?

Answer 34

Try to make a fist but cannot close 4th and 5th digits

Question 35

What nerves/branches come off of the posterior cord? 5

Answer 35

``` Superior subscapular nerve thoracodorsal nerve Inferior subscapular nerve axillary nerve Radial nerve ```

Question 36

What is the largest nerve coming off of the posterior cords?

Answer 36

Radial nerve

Question 37

The superior subscapular nerve contains fibers from what?

Answer 37

C5 and C6

Question 38

The superior subscapular nerve supplies what muscle

Answer 38

subscapularis (a rotator cuff)

Question 39

The thoracodorsal nerve contains fibers from what nerve?

Answer 39

C6, C7, and C8

Question 40

The thoracodorsal nerve travels along what? To supply what muscle?

Answer 40

Posterior axillary wall | latissimus dorsi