Nerves Of Brachial Plexus (Osu Cvm 2018)

Front 1

Back 1

Brachial Plexus

Front 2

Brachial Plexus origin

Back 2

Ventral branches of spinal nerves C6, C7, C8, T1, T2 (and sometimes C5)

Front 3

Nerves that arise from the Brachial Plexus and innervate the extrinsic thoracic limb

Back 3

CCTLL

Cranial Pectoral nn. (C6, C7, C8)

Caudal pectoral nn. (C8, T1, T2)

Thoracodorsal n. (C8)

Lateral thoracic n. (C8, T1)

Long thoracic n (C7)

Front 4

Nerves arising from the Brachial plexus that innervate the intrinsic thoracic limb

Back 4

SS MARMU

Suprascapular n.

Subscapular n.

Musculocutaneous n.

Axillary n.

Radial n.

Median n.

Ulnar n.

Front 5

The Brachial plexus is divided into 3 parts, one of which is divided again. What are these parts?

Back 5

1. Cranial Part

2. Middle Part (subdivided into cranial portion, middle portion, and caudal portion)

3. Caudal Part

Front 6

Back 6

Brachial Plexus

Front 7

Back 7

Suprascapular nerve

Front 8

Suprascapular nerve origin

Back 8

cranial part of Brachial plexus

C6, C7

Front 9

Suprascapular nerve: general location relative to muscles/bones

Back 9

Between subscapularis and supraspinatus muscles

Then courses along scapular notch

(more pone to injury due to location)

Front 10

Suprascapular nerve: muscular and cutaneous innervations

Back 10

Supraspinatus m.

Infraspinatus m.

No cutaneous innervation

Front 11

Suprascapular nerve: general muscle action(s)

Back 11

Extends shoulder joint

Front 12

Result(s) of Suprascapular nerve dysfunction:

Back 12

reduced shoulder extension

muscle atrophy of supraspinatus and infraspinatus

lameness

Front 13

Back 13

Muscle: Subscapularis m.

Nerve: Subscapularis n.

Front 14

Subscapular nerve

muscular and cutaneous innervation

Action of muscle(s)

Result(s) of nerve dysfunction

Back 14

Subscapular m., no cutaneous innervation

Extends shoulder joint

No marked change in gait

Front 15

Back 15

Nerve: Musculocutaneous n.

Coracobrachialis m.

Biceps brachii m.

Front 16

Back 16

Nerve A: Musculocutaneous n.

Nerve B: Median n.

Front 17

Musculocutaneous nerve origin

Back 17

Brachial plexus Middle part, Cranial portion

C6, C7, C8

Front 18

Musculotaneous nerve: muscle and cutaneous innervation

Back 18

BBC

Biceps brachii m.

Brachialis m.

Coracobrachialis m.

Medial cutaneous antebrachial n. (cutaneous)

Front 19

Musculocutaneous nerve action(s)

Back 19

Extend shoulder joint, flex elbow

(the "uppercut" nerve)

Front 20

Back 20

musculocutaneous nerve

medial cutaneous antebrachial nerve

(autonomous zone)

Front 21

Back 21

overlap zone:

musculocutaneous, median, and ulnar nn.

(nerve fibers course with median n. by way of communicating branch)

Front 22

result of musculocutaneous nerve dysfunction (motor)

Back 22

reduced flexion of elbow joint

loss of bicipital reflex

Front 23

Axillary nerve origin

Back 23

Brachial plexus Middle part, Middle portion

C7, C8

Front 24

Axillary nerve: muscle and cutaneous innervation

Back 24

AXE STTDs

caudal part of Subscapularis m.

Teres major m.

Teres minor m.

Deltoideus m.

Front 25

Axillary nerve, muscle action

Back 25

flex shoulder joint

Front 26

Back 26

Axillary nerve

Cranial lateral cutaneous brachial n. (Craniolateral shoulder area, autonomous zone)

Cranial cutaneous antebrachial n.

(Cranial aspect of antebrachium, overlap zone with radial nerve)

Front 27

Axillary nerve dysfunction (motor)

Back 27

Reduced shoulder joint flexion

atrophy of deltoideus m.

Front 28

Radial nerve origin

Back 28

Brachial plexus Middle part, Caudal portion

C7, C8, T1, T2

Front 29

Back 29

Radial nerve

A. Deep branch

B. Superficial branch

Front 30

Radial nerve, muscle innervation (brachial region only)

Back 30

Triceps brachii

Tensor fasciae antebrachii

Anconeus

Front 31

Radial nerve, brachial region, muscle action

Back 31

Extend the elbow

Front 32

After innervating nerves of the brachial region, Radial nerve divides into:

Back 32

Deep and superficial branches

Front 33

Radial nerve deep branch, innervates:

Back 33

Extensors and Supinators (ECLUA,

(Extensor carpi radialis, Common digital extensor, Lateral digital extensor, Ulnaris lateralis, Abductor pollicis longus, Supinator, Brachioradialis)

Front 34

Radial nerve superficial branch,

cutaneous innervation:

Back 34

antebrachium: cranial and lateral aspects

manus: dorsal and medial aspects

Front 35

Radial nerve Superficial branch divides into:

Back 35

lateral and medial branches

Front 36

Radial nerve superficial branch course

Back 36

courses medial (medial branch) and lateral (lateral branch) to cephalic vein on the cranial lateral aspect of the thoracic limb

Front 37

Back 37

medial branch of superficial radial nerve

Front 38

Back 38

A. Lateral branch of superficial radial nerve

B. Lateral cutaneous antebrachial nerve

Front 39

Radial nerve dysfunction (high damage)

Back 39

reduced extension of elbow, carpus, and digits

"dropped" elbow

inability to support weight on limb

loss of tricipital reflex

atrophy of triceps brachii m.

animal walks on dorsum of manus

Front 40

Back 40

Median nerve (with brachial artery)

Front 41

Median nerve, muscle innervation

Back 41

PPFSD

Pronator teres m.

Pronator quadratus m.

Flexor carpi radialis m.

Superficial digital flexor m.

Deep digital flexor m. (all heads)

Front 42

Median nerve course

Back 42

courses with the brachial artery in the brachial region

courses with the median artery in the antebrachial region

Front 43

Median nerve dysfunction

Back 43

reduced flexion of carpus and digits

Front 44

Median nerve origin

Back 44

Brachial plexus Caudal part

C8, T1, T2

Front 45

Back 45

A. Ulnar nerve

B. Caudal cutaneous antebrachial nerve

C. Ulnar nerve, dorsal branch

D. Ulnar never, palmar branch

Front 46

Back 46

A. Ulnar nerve

B. Caudal cutaneous antebrachial nerve

Front 47

Ulnar nerve origin

Back 47

Brachial plexus Caudal part

C8, T1, T2

Front 48

Back 48

dorsal branch of ulnar n.

Front 49

Back 49

A. caudal cutaneous antebrachial nerve

B. dorsal branch of ulnar nerve

Front 50

Ulnar nerve divides into:

Back 50

Dorsal branch

Palmar branch

caudal cutaneous antebrachial nerve

Front 51

Ulnar nerve palmar branch, innervation

Back 51

motor to interossei

sensory to palmar aspect of manus (overlap zone)

Front 52

Ulnar nerve dorsal branch, innervation

Back 52

sensory to abaxial surface of digit 5

(autonomous zone)

Front 53

In proximal antebrachial region (before splitting), ulnar n. innervates:

Back 53

Flexor carpi ulnaris m. (ulnar and humeral heads)

Deep digital flexor m. (ulnar and humeral heads)

autonomous sensory zone, caudal aspect of antebrachium

Front 54

Ulnar n. dysfunction:

Back 54

reduced flexion of carpus and digits

Front 55

Back 55

1. Axillary n. (cranial lateral cutaneous brachial n.)

2. Musculocutaneous n. (medial cutaneous antebrachial n.)

3. Ulnar n. (caudal cutaneous antebrachial n. and dorsal br.)

4. Radial n. (superficial br., medial br, lateral br (lateral cutaneous antebrachial n.))

Front 56

Back 56

1. Ulnar n., dorsal br.

2. Radial n., medial br.

3. Radial n., lateral br.

4. overlap zone. Median, musculocutaneous, and ulnar nn.

Front 57

Brachial plexus nerve block

location

anesthesia effect

Back 57

location: inject between shoulder and thoracic wall at the level of the point of the shoulder

effect: provides anesthesia distal to the elbow

Front 58

Declaw ring nerve block

location/procedure

nerves blocked

Back 58

location: make 2 line blocks just proximal to carpus

nerves affected: median n. (with musculocutaneous fibers), ulnar n. (dorsal and palmar branches)

Radial n. (superficial br.)