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Anatomy > UE Nerves > Flashcards

UE Nerves Flashcards

1
Q

Origin: Dorsal Scapular n.

A

Posterior aspect of anterior ramus of C5 w/ a grequent contribution from C4

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2
Q

Course: Dorsal Scapular n.

A

Pierces middle scalene; descends deep to levator scapulae and rhomboids

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3
Q

Structures Innervated: Dorsal Scapular n.

A

Rhomboids; occasionally supplies levator scapulae

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4
Q

Origin: Thoracodorsal n.

A

side branch of posterior cord, receiving fibrs from C6, C7, and C8

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5
Q

Course: Thoracodorsal n.

A

arises between upper and lower subscapular nerves and runs inferolaterally along posterior axillary wall to apical part of latissimus dorsi

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6
Q

Structures Innervated: Thoracodorsal n.

A

latissimus dorsi

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7
Q

Origin: Subclavian n.

A

Superior trunk, receiving fibers from C5, C6, and often C4

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8
Q

Course: Subclavian n.

A

descends posterior to clavicle and anterior to brachial plexus and subclavian artery; often giving an accessory root to phrenic nerve

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9
Q

Structures Innervated: Subclavian n.

A

subclavius and sternoclavicular joint (accessory phrenic root innervates diaphragm)

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10
Q

Origin: Suprascapular n.

A

Superior trunk, receiving fibers from C5, C6, and often C4

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11
Q

Course: Suprascapular n.

A

passes laterally across lateral cervical region (posterior triangle of neck), superior to brachia plexus; then through scapular notch inferior to superior transverse scapular ligament

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12
Q

Structures Innervated: Suprascapular n.

A

supraspinatus and infraspinatus muscles; glenohumeral (Shoulder) joint

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13
Q

Origin: Lateral Pectoral n.

A

side branch of lateral cord, receiving fibers from C5, C6, and C7

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14
Q

Course: Lateral Pectoral n.

A

pierces costocoracoid membrane to reach deep surface of pectoral muscles; a communicating branch to the medial pectoral nerve passes anterior to axillary artery and vein

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15
Q

Structures Innervated: Lateral Pectoral n.

A

Primarily pectoralis major; but some lateral pectroal nerve fibers pass to pectoralis minor via branch to medial pectoral nerve

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16
Q

Origin: Musculocutaneous n.

A

terminal branch of lateral cord, receiving fibers from C5-C7

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17
Q

Course: Musculocutaneous n.

A

exits axilla by piercing coracobrachialis; descends between biceps brachii and brachialis, supplying both; continues as lateral cutaneous nerve of forearm

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18
Q

Structures Innervated: Musculocutaneous n.

A

muscles of anterior compartment of arm (coracobrachialis, biceps brachii, and brachialis); skin of lateral aspect of forearm

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19
Q

Origin: Median n.

A

Lateral root of median nerve: is a terminal branch of lateral cord

Medial root of median nerve: is a terminal branch of medial cord

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20
Q

Course: Median n.

A

Lateral & Medial roots merge to form median nerve lateral to axiallary artery; descends through arm adjacent to brachial artery, with nerve gradually crossing anterior to artery to lie medial to artery

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21
Q

Structures Innervated: Median n.

A

muscles of anterior forearm compartment (except for flexor carpi ulnaris and ulnar half of flexor digitorum profundus), five intrinsic muscles in thenar half of palm and palmar skin

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22
Q

Origin: Median Pectoral n.

A

side branch of medial cord, receiving fibers from C8-T1

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23
Q

Course: Median Pectoral n.

A

passes between axillary artery and vein; then pierces pectoralis minor and enters deep surface of pectoralis major; although it is called medial for its origin from medial cord, it lies lateral to lateral pectoral nerve

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24
Q

Structures Innervated: Median Pectoral n.

A

Pectoralis minor and sternocostal part of pectoralis major

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25
Q

Origin: Ulnar n.

A

larger terminal branch of medial cord, receiving fibers from C8, T1, and often C7

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26
Q

Course: Ulnar n.

A

descends medial arm; passes posterior to medial epicondyle of humerus; then desecneds ulnar aspect of forearm to hand

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27
Q

Structures Innervated: Ulnar n.

A

flexor carpi ulnars and ulnar half of flexor digitorum profundus; most intrinsic muscles of hand; skin of hand medial to axial line of digit 4

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28
Q

Origin: Medial (brachial) Cutaneous nerve of the arm

A

side branch of medial cord, receiving fibers from C8-T1

29
Q

Course: Medial (brachial) Cutaneous nerve of the arm

A

smallest nerve of plexus; runs along medial side of axillary and brachial veins, communicates with intercostobrachial nerve

30
Q

Structures Innervated: Medial (brachial) Cutaneous nerve of the Arm

A

skin of medial side of arm, as far distal as medial epicondyle of humerus and olecranon of ulna

31
Q

Origin: Medial (antebrachial) Cutaneous nerve of the Forearm

A

side branch of medial cord, receiving fibers from C8-T1

32
Q

Course: Medial (antebrachial) Cutaneous nerve of the Forearm

A

initally runs with ulnar nerve, but pierces deep fascia w/ basilic vein and enters subcutaneous tissue, dividing into anterior and posterior branches

33
Q

Structures Innervated: Medial (antebrachial) Cutaneous nerve of the Forearm

A

skin of medial side of forearm, as far distal as wrist

34
Q

Origin: Upper Scapular n.

A

side branch of posterior cord, receiving fibers from C5

35
Q

Course: Upper Scapular n.

A

Passes posteriorly, entering subscapularis directly

36
Q

Structures Innervated: Upper Scapular n.

A

superior portion of subscapularis

37
Q

Origin: Lower Scapular n.

A

side branch of posterior cord, receiving fibers from C6

38
Q

Course: Lower Scapular n.

A

passes inferolaterally, deep to subscapular artery and vein

39
Q

Structures Innervated: Lower Scapular n.

A

inferior portion of subscapularis and teres major

40
Q

Origin: Axillary n.

A

Terminal branch of posterior cord receiving fibers from C5 and C6

41
Q

Course: Axillary n.

A

exits axillary fossa posteriorly, passing through quadrangular space w/ posterior circumflex humeral artery; gives rise to superior lateral brachial cutaneous nerve; then winds around surgical neck of humerus deep to deltoid

42
Q

Structures Innervated: Axillary n.

A

glenohumeral joint; teres minor and deltoid muscles; skin of superolateral arm (over inferior part of deltoid)

43
Q

Origin: Radial n.

A

larger terminal branch of posterior cord (largerst branch of plexus), receiving fibers from C5-T1

44
Q

Course: Radial n.

A

exits axillary fossa posterior to axillary artery; passes posterior to humerus in radial groove w/ deep brachial artery, between lateral and medial heads of triceps; perforates alteral intrmuscular septum; enters cubital fossa, dividing into superficial (cutaneous) and deep (motor) radial nerves

45
Q

Structures Innervated: Radial n.

A

all muscles of posterior compartments of arm and forearm; skin of posterior and inferolateral arm, posterior forearm, and dorsum of hand lateral to axial line of digit 4

46
Q

Origin: Vagus (CN X)

A

8-10 rootlets from medulla of brainstem

47
Q

Course: Vagus (CN X)

A

enters superior mediastinum posterior to sternoclavicular joint and brachiocephalic vein; gives rise to recurrent laryngeal nerve; passes posterior to roots of lungs to form esophageal plexus; continues into abdomen

48
Q

Structures Innervated: Vagus (CN X)

A

ulmonary plexus, esophageal plexus, and cardiac plexus

49
Q

Origin: Lesser Occipital n.

A

Arising from the nerve loop from the anterior rami of C2

50
Q

Structures Innervated: Lesser Occipital n.

A

supplies skin of neck and scalp posterosuperior to the auricle

51
Q

Origin: Greater Auricular n.

A

Arisingfrom the nerve loop between anterior rami of C2 & C3

52
Q

Course: Greater Auricular n.

A

ascends vertically across the oblique SCM to the inferior pole of the parotid gland

53
Q

Structures Innervated: Greater Auricular n.

A

supplies the skin over the sheath surrounding the parotid gland, mastoid process, and both surfaces of the auricle and an area of skin extending from the angle of the mandible to the mastoid process

54
Q

Origin: Transverse Cervical n.

A

Arisingfrom the nerve loop between anterior rami of C2 & C3

55
Q

Course: Transverse Cervical n.

A

curves around middle of posterior border of SCM inferior to the great auricular nerve and passes anteriorly and horizontally across it deep to the EJV and platysma, dividing into superior and inferior branches

56
Q

Structures Innervated: Transverse Cervical n.

A

Supplies the skin covering the anterior cervical region

57
Q

Origin: Supraclavicular n.

A

Arisingfrom the nerve loop between anterior rami of C3 & C4

58
Q

Course: Supraclavicular n.

A

emerge as a common trunk under cover of SCM

59
Q

Structures Innervated: Supraclavicular n.

A

skin of the neck that cross the clavicle and supply the skin over the shoulder

60
Q

Origin: Ansa Cervicalis

A

Superior and inferior roots of ansa cervicalis unite forming secondary loop from C1-C3 spinal nerves

61
Q

Course: Ansa Cervicalis

A

Branch from secondary loop

62
Q

Structures Innervated: Ansa Cervicalis

A

supply infrahyoid muscles (omohyoid, sternothyroid, & sternohyoid)

63
Q

Origin: Spinal Accessory n.

A

CN XI somatic motor from cervical spinal cord

64
Q

Course: Spinal Accessory n.

A

jugular foramen

65
Q

Structures Innervated: Spinal Accessory n.

A

sternocleidomastoid & trapezius

66
Q

Origin: Long Thoracic n.

A

Posterior aspect of anterior rami of C5, C6, C7

67
Q

Course: Long Thoracic n.

A

Passes through cervico-axillary canal, descending posterior to C8 and T1 roots of plexus (anterior rami); runs inferiorly on superficial surface of serratus anterior

68
Q

Structures Innervated: Long Thoracic n.

A

Serratus anterior

Anatomy (25 decks)

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