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Hugh's MD1 Musculo-Skeletal > Nerves of the Upper Limb > Flashcards

Nerves of the Upper Limb Flashcards

1
Q

Which divisions make the lateral cord?

A

Ant div. of the sup and middle trunk

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2
Q

Where is the median nerve susceptable to damage?

A

In the carpal tunnel

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2
Q

What is the cutaneous innervation of the median nerve?

A

Lateral 3 and a half fingers and corresponding palmar skin

Lateral 3 and half finger’s nail beds (at least) on the dorsal side

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3
Q

Where does the axillary nerve emerge from posteriorly?

A

Above the teres minor

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4
Q

What is the course of the musculocutaneous nerve?

A

Pierces the coracobrachialis

Runs in the flexor compartment of arm (in between biceps and brachialis)

Pass ant of elbow and runs in the latero-superficial

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4
Q

What is innervated by the musculocutaneous nerve?

A

Flexor muscles of the arm

Lateral skin of the forearm

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4
Q

Which muscles does the ulnar nerve supply?

A

Forearm: FCU and medial aspect of FDP

Hand: All the muscles of the hand except those supplied by the median nerve

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5
Q

What is the cutaneous innervation of the ulnar nerve?

A

Median 1 and a half fingers and their corresponding palm and dorsum

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6
Q

Where does the radial nerve run in the arm?

A

Emerges from under teres minor

Runs medial to lateral

Tucks under cover of brachioradialis

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6
Q

What supplies the lateral aspect of the skin of the upper limb?

A

Axillary > Radial > Musculocutaneous (ARM)

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7
Q

Where do nerves of the limb bud branch from the distribution of spinal nerves?

A

Lat. cutaneous branch

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7
Q

What is the course of the median nerve in the forearm?

A

Under the fibrous arch of the FDS

Runs down in between FDS and FDP

Through the carpal tunnel

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7
Q

Will a fracture of the humerus effect the triceps muscle?

A

No, because it is innervated by the radial nerve right after it emerges from the teres minor

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8
Q

What is the cutaneous innervation of the radial nerve?

A

Poster aspect of the upper limb including the dorsal aspect of the lateral 3.5 fingers (except their nail beds)

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9
Q

What are the roots of the musculocutaneous nerve?

A

C5,6 and 7

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10
Q

How are the cords named?

A

By their relation with the axillary a.

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11
Q

Which divisions make the medial cord?

A

Ant division of the inferior trunk

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11
Q

Which muscles of the hand does the median nerve supply?

A

Thenar and lateral 2 lumbricals

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13
Q

Which muscles do the median and ulnar nerves supply?

A

Flexors of the forearm and hand

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14
Q

What are the rami supply of the skin of the upper limb?

A

C4 - T1

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15
Q

What nerves originate from the posterior cord?

A

Axillary and radial

15
Q

What are the rami of the axillary nerve?

A

C5 and 6

17
Q

Where are the divisions of the BP located?

A

Under the clavicle

19
Q

What nerves originate from the lateral cord?

A

Musculocutaneous and half the median nerve

20
Q

Which muscles does the radial nerve supply?

A

All extensors in the upper limb

21
Q

T/F The superficial branch of the radial nerve supplies the ECR

A

False, it has no motor supply

22
Q

Which muscles does the axillary nerve supply?

A

Teres minor and deltoids

24
Q

Which rami make the middle trunk?

A

C7

26
Q

Which muscles does the radial nerve supply?

A

All extensors of the upper limb

27
Q

What do the anterior division of the BP supply?

A

The flexor compartments and their overlying skin

27
Q

Which divisions make up the posterior cord?

A

Post div. of the sup, middle and inferior trunks

27
Q

What is the course of the radial nerve in the forearm?

A

Split into superficial and deep branches

  • Superficial doesn’t enter the brachoradialis, instead running superficial and over the extensor retinaculum
  • Deep passes through the supinator and runs down
28
Q

What skins does the axillary nerve supply?

A

Skin overlying deltoid

30
Q

What do the posterior divisions supply?

A

Extensor muscles and overlying skin

31
Q

What are the roots of the ulnar nerve?

A

(C7) C8 and T1

33
Q

What is the hierarchy of nomenclature in the brachial plexus from proximal to distal (eg root vs cords etc)

A

Root > Trunk > Ant/Post division > Cords > Peripheral nerves

34
Q

Which nerves originate from the medial cord?

A

Ulnar and half the median

35
Q

When can the axillary nerve be damaged?

A

Shoulder dislocation

37
Q

What is the course of the ulnar nerve in the forearm?

A

Through the 2 heads of the FCU

Runs over FCU and on medial aspect of FDP

Runs over the flexor retinaculum

39
Q

Which rami make the superior trunk?

A

C5,6

40
Q

What are the roots of the median nerve?

A

C5,6,7,8 and T1

41
Q

Which forearm muscles does the median nerve supply?

A

All except FCU and medial half of FDP

42
Q

When is the radial nerve exposed to damage?

A

Humerus fracture

Ill fitting crutch

44
Q

What is the course of the ulnar nerve in the arm?

A

Medial to the brachial a.

Behind the medial epicondyle

45
Q

What is the course of the median nerve in the arm?

A

Ant to the brachial a. til it ends up lying medial

Ant to the elbow joint

46
Q

Which rami make the inferior trunk?

A

C8 T1

47
Q

Which rami usually make the brachial plexus?

A

C5,6,7,8, T1

48
Q

Which nerves can sometimes be confused for the ulnar nerve?

A

Medial brachial cutaneous nerve of arm

Medial antebrachial cutaneous nerve of the forearm

49
Q

How can you find the musculocutaneous nerve?

A

It pierces the coracobrachialis muscle

50
Q

Where are potential locations of ulnar nerve damage?

A

Medial epicondyle

Wrist

51
Q

Where are the roots and trunks of the brachial plexus located?

A

Supraclavicular

52
Q

Where are the cords and terminal branches of the BP located?

A

Infraclavicular

Hugh's MD1 Musculo-Skeletal (7 decks)

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