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620: Clinical Human Anatomy > Brachial Plexus > Flashcards

Brachial Plexus Flashcards

1
Q

What do the anterior rami of spinal nerves C5-T1 form?

A

the Brachial Plexus

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2
Q

Describe how the brachial plexus weaves in and out of the clavicle and 1st rib

A

It is posterior to the clavicle, but anterior to the first rib

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3
Q

How many roots are there in the brachial plexus?

A

5 (C5-T1)

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4
Q

Where do these roots pass through?

A

The gap between the anterior and middle scalene muscles along with the subclavian artery

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5
Q

In the inferior part of the neck the 5 roots unite to form what?

A

3 trunks

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6
Q

What are the names of the 3 roots and how did they form?

A

Superior Trunk formed from the union of C5 and C6
Middle Trunk is just a continuation of C7
Inferior Trunk formed from the union of C8 and T1

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7
Q

What happens to the three roots as they pass posterior to the clavicle?

A

They divide into anterior and posterior DIVISIONS

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8
Q

These divisions form what?

A

3 CORDS

Lateral, Medial, and Posterior

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9
Q

The lateral cord forms as a result of what?

A

The union of the anterior division of superior and middle trunks

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10
Q

The medial cord forms as a result of what?

A

It is just a continuation of the anterior division of the inferior trunk

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11
Q

The posterior cord forms as a result of what?

A

The union of the posterior divisions of all 3 trunks

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12
Q

Each cord gives rise to what?

A

Branches or Nerves

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13
Q

How many branches arise from the lateral cord?

What are they called?

A

3

1) Lateral Pectoral Nerve
2) Musculocutaneous Nerve
3) Median Nerve (partly)

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14
Q

How many branches arise from the medial cord?

What are they called?

A

5

1) Median Pectoral Nerve
2) Medial Brachial Cutaneous Nerve
3) Medial Antebrachial Cutaneous Nerve
4) Median Nerve (partly)
5) Ulnar Nerve

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15
Q

How many branches arise from the posterior cord?

What are they called?

A

5

1) Upper Subscapular Nerve
2) Lower Subscapular Nerve
3) Thoracodorsal Nerve
4) Axillary Nerve
5) Radial Nerve

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16
Q

There are 2 branches/nerves that arise from the roots, what are they?

A

1) Dorsal Scapular Nerve

2) Long Thoracic Nerve

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17
Q

There are 2 branches/nerves that arise from the trunks, what are they?

A

1) Nerve to Subclavius

2) Suprascapular Nerve

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18
Q

The Long thoracic nerve has origins from where?

A

C5-7

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19
Q

What does the long thoracic nerve innervate?

A

Serratus Anterior

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20
Q

The dorsal scapular nerve has origins from where?

A

C5

21
Q

What does the dorsal scapular nerve innervate?

A

Rhomboids

Levator Scapulae

22
Q

The subclavian nerve has origins from where?

A

C5 and C6

23
Q

What does the subclavian nerve innervate?

A

Subclavius

24
Q

The suprascapular nerve has origins from where?

A

C5 and C6

25
Q

What does the suprascapular nerve innervate?

A

Supraspinatous

Infraspinatous

26
Q

The lateral pectoral nerve has origins from where?

A

C5 and C6

27
Q

What does the lateral pectoral nerve innervate?

A

Pectoralis Major

28
Q

The upper subscapular nerve has origins from where?

A

C5 and C6

29
Q

What does the upper subscapular nerve innervate?

A

Superior Portion of Subscapularis

30
Q

The thoracodorsal nerve has origins from where?

A

C6-8

31
Q

What does the thoracodorsal nerve innervate?

A

Latissimus Dorsi

32
Q

The lower subscapular nerve has origins from where?

A

C5-6

33
Q

What does the lower subscapular nerve innervate?

A

Inferior Portion of Subscapularis

Teres Major

34
Q

The medial pectoral nerve has origins from where?

A

C8 and T1

35
Q

What does the medial pectoral nerve innervate?

A

Pectoralis Major and Minor

36
Q

The medial brachial cutaneous nerve has origins from where?

A

T1

37
Q

What does the medial brachial cutaneous nerve innervate?

A

Skin of medial side of arm

38
Q

The medial antebrachial cutaneous nerve has origins from where?

A

C8 and T1

39
Q

What does the medial antebrachial cutaneous nerve innervate?

A

Skin of medial side of forearm

40
Q

The musculocutaneous nerve has origins from where?

A

C5-7

41
Q

What does the musculocutaneous nerve innervate?

A

Corocobrachialis
Brachialis
Biceps Brachii

42
Q

The axillary nerve has origins from where?

A

C5 and C6

43
Q

What does the axillary nerve innervate?

A

Deltoid

Teres Minor

44
Q

The radial nerve has origins from where?

A

C5-T1

45
Q

What does the radial nerve innervate?

A 
Triceps Brachii
Anconeus
Bracioradialis
Supinator
Extensors of the Forearm
46
Q

The median nerve has origins from where?

A

C5-T1

47
Q

What does the median nerve innervate?

A 
Pronator Teres
Flexor Carpi Radialis
Palmaris Longus
Flexor Digitorum Superficialis
Flexor Digitorum Profundus (lateral half)
Flexor Pollicus Longus
Pronator Quadratus
Lumbricals 1 & 2
Opponens Pollicis
Abductor Pollicis Brevis
Flexor Pollicis Brevis
48
Q

The ulnar nerve has origins from where?

A

C7-T1

49
Q

What does the ulnar nerve innervate?

A

Flexor Carpi Ulnaris
Flexor Digitorum Profundus (ulnar half)
Intrinsic Hand Muscles

620: Clinical Human Anatomy (29 decks)

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