SA Thoracic Limb - Muscles and VANs

Question 1

Long Head of Triceps Brachii m.

Answer 1

O: Caudal Border of Scapula
I: Olecranon
A: Flex Shoulder; Extend Elbow
Inn: Radial N.
Art: Deep Brachial A.

Question 2

Deltoideus m. (2H)

Answer 2

O: Scapula Spine; Acromion
I: Deltoid Tuberosity
A: Flex shoulder
Inn: Axillary N.
Art: Caudal Circumflex Humeral A.

Question 3

Teres Major m.

Answer 3

O: Caudal border of the scapula
I: Teres Major tuberosity
A: Flex shoulder
Inn: Axillary n.
Art: Cd. Circumflex Humeral a.; Thoracodorsal a.

Question 4

Teres Minor m.

Answer 4

O: Cd. border of scapula
I: Teres Minor tuberosity
A: Flex shoulder
Inn: Axillary n.
Art: Subscapular a.; Cd. Circumflex Humeral a.

Question 5

Biceps Brachii m.

Answer 5

O: Supraglenoid tubercle
I: Radial Ulnar Tuberosity
A: Extend shoulder; flex elbow
Inn: Musculocutaneous n.
Art: Bicipital a., Cr. Circumflex Humeral a.

Question 6

Coracobrachialis m.

Answer 6

O: Corocoid process
I: Crest of the Lesser Tubercle
A: Extend shoulder
Inn: Musculocutaneous n.
Art: Cr. Circumflex Humeral a.

Question 7

Subscapularis m.

Answer 7

O: Subscapular fossa
I: Lesser tubercle
A: Extend shoulder
Inn: Subscapular n., Axillary n.
Art: Subscapular a.

Question 8

Supraspinatus m.

Answer 8

O: Supraspinous fossa
I: Greater Tubercle
A: Extend shoulder
Inn: Suprascapular n.
Art: Subscapular a., Cd. Circumflex Humeral a.

Question 9

Infraspinatous m.

Answer 9

O: Infraspinous fossa
I: Greater tubercle
A: extend shoulder
Inn: Suprascapular n.
Art: Subscapular n., Cd. Circumflex Humeral a.

Question 10

Brachialis m.

Answer 10

O: Lateral border of humerus
I: Radial ulnar tubercle
A: Flex shoulder
Inn: Musculocutaneous n.
Art: Bicipetal a., Cr. Circumflex Humeral a.

Question 11

Triceps brachii mm. (4H)

Answer 11

O: Caudal border of scapular (long); Tricipital line (lateral); Lesser tubercle (median); neck of the humerus (acc.)
I: Olecranon
A: Extend elbow
Inn: Radial n.
Art: Deep brachial a.

Question 12

Anconeus m.

Answer 12

O: Lateral and Medial Epicondyle
I: Olecranon
A: extend elbow
Inn: Radial n.
Art: Deep brachial a.

Question 13

Tensor fascia antebrachium m.

Answer 13

O: Latissimus dorsi m.
I: Olecranon
A: Extend elbow
Inn: Radial n.
Art: Common interosseous and Deep Brachial aa.

Question 14

Extensor Carpi Radialis m.

Answer 14

O: Lateral Supracondyle Crest
I: Dorsal Metacarpus I/II
A: Extend carpus
Inn: Radial n.
Art: Radial a.

Question 15

Common Digital Extensor m.

Answer 15

O: Lateral epicondyle
I: Extensor of Distal Phalanges
A: Extends carpus and digits
Inn: Radial n.
Art: Radial a.

Question 16

Lateral Digital Extensor m.

Answer 16

O: Lateral epicondyle
I: Extensor process of III-V
A: Extends carpus + digits III-V
Inn: Radial n.
Art: Radial a.

Question 17

Ulnaris Lateralis m.**

Answer 17

O: Lateral epicondyle
I: Accessory carpal/Lateral Digit V
A: Flex carpus
Inn: Radial n.
Art: Radial a.

Question 18

Flexor carpi ulnaris m. (2H)

Answer 18

O: Olecranon (Ulnar), Medial Epicondyle (Humerus)
I: Accessory carpal
A: Flex carpus
Inn: Ulnar n.
Art: Deep antebrachial a.

Question 19

Superficial digital flexor m.

Answer 19

O: Medial epicondyle
I: Palmar bones of middle phalanx II-IV
A: Flex carpus
Inn: Median and Ulnar nn.
Art: Deep antebrachial a.

Question 20

Deep digital flexor m. (3H)

Answer 20

O: Medial epicondyle (humerus), Medial radius (Radius), caudal ulna (ulna)
I: Flexor tubercle
A: Flex carpus + digits
Inn: Median n., Ulnar n.
Art: Deep antebrachial a.

Question 21

Flexor carpi radialis m.

Answer 21

O: Medial epicondyle
I: palmar metacarpal
A: Flex carpus
Inn: Median n.
Art: Deep antebrachial a.

Question 22

What are the 5 veins of the thoracic limb? (CAMBM)

Answer 22

Cephalic v.
Accessory cephalic v.
Median cubital v.
Brachial v.
Median v.

Question 23

What area does the Subclavian a. supply blood to?

Answer 23

Inside the thorax

Question 24

What are the 4 main arteries of the thoracic limb? (SABM)

Answer 24

Subclavian a.
Axillary a.
Brachial a.
Median a.

Question 25

External Thoracic a.

Answer 25

Supplies blood to the superficial pectoral

Question 26

Lateral Thoracic a.

Answer 26

Supplies blood to the Deep pectoral AND houses the axillary lymph node

Question 27

Subscapular a.

Answer 27

Supplies blood to the Scapular region (entire shoulder); Has 2 branches --> Cd. Circumflex Humeral a. and Thoracodorsal a.

Question 28

Caudal Circumflex Humeral a.

Answer 28

Supplies blood to the Teres major and Shoulder region

Question 29

Thoracodorsal a.

Answer 29

Supplies blood to the Latissimus dorsi and Teres Major

Question 30

Cranial Circumflex Humeral a.

Answer 30

Supplies blood to the biceps (cranial humerus)

Question 31

Deep brachial a.

Answer 31

Supplies blood to the Triceps brachii mm.

Question 32

Bicipital a.

Answer 32

Supplies blood to the Biceps

Question 33

Collateral Ulnar a.

Answer 33

Supplies blood to the caudal elbow

Question 34

Transverse Cubital a.

Answer 34

Supplies blood to the cranial elbow (RMBR "cubit" = Elbow)

Question 35

Common Interosseous a.

Answer 35

Supplies blood to the Radius and Ulna (runs between the two bones)

Question 36

Deep antebrachial a.

Answer 36

Supplies blood to the flexors of the carpus

Question 37

Radial a.

Answer 37

Supplies blood to the dorsal manus and extensors

Question 38

Cranial Pectoral n.

Answer 38

Innervates the superficial pectoral m.

Question 39

Caudal pectoral n.

Answer 39

Innervates the deep pectoral m.

Question 40

Lateral thoracic n.

Answer 40

Innervates the cutaneous trunci m. (responsible for the panniculus reflex)

Question 41

Suprascapular n.

Answer 41

Innervates the Supraspinatus and Infraspinatus muscles

Question 42

Subscapularis n.

Answer 42

Innervates the Subscapularis

Question 43

Thoracodorsal n.

Answer 43

Innervates the Latissimus dorsi

Question 44

Musculocutaneous n.

Answer 44

Extends the shoulder; flexes the elbow Innervates the: Biceps brachii Brachialis Coracobrachialis

Question 45

Axillary n.

Answer 45

Flexes the shoulder Innervates the: Subscapularis Teres major Teres minor Deltoideus

Question 46

Radial n.

Answer 46

Extends elbow and carpus Innervates ALL elbow and carpus extensors (TAT and ECLU)

Question 47

Median n.

Answer 47

Flexes the carpus and manus; communicates with the musculocutaneous n. Innervates the: Flexor carpi radialis SDF DDF

Question 48

Ulnar n.

Answer 48

Flexes carpus and manus; provides sensory to the 5th digit Innervates the Flexor carpi ulnaris and DDF

Question 49

Brachial Plexus

Answer 49

Ventral branches of spinal nerves C6-T2

Question 50

Which nerve is responsible for the autonomous zone of the 5th digit

Answer 50

Ulnar n.

Question 51

Which nerve is responsible for the autonomous zone of the dorsal antebrachial region?

Answer 51

Radial n.

Question 52

Which nerve is responsible for the autonomous zone of the medial brachium?

Answer 52

Musculocutaneous n.

Question 53

What would be the effect of damage to the proximal Radial n.?

Answer 53

Loss of ability to extend the elbow, carpus, and digit; unable to support weight on the forelimb

Question 54

What would be the effect of damage to the distal Radial n.?

Answer 54

Unable to extend carpus and digits (elbow can still extend so weight will be supported) loss of sensation to the cranial antebrachium and dorsal paw Will lead to knuckling at the carpus

Question 55

What would be the effect of damage to the Median and Ulnar nerves?

Answer 55

Unable to flex the carpus and digits (hyperextension of the carpus and fetlock) loss of sensation to palmar paw; loss of sensation to lateral paw and 5th digit (ULNAR ONLY)

Question 56

What would be the effect of damage to the Axillary n.?

Answer 56

Unable to flex shoulder (loss of stability) leading to a "dropped" shoulder loss of sensation to the lateral brachium and caudal scapular

Question 57

What would be the effect of damage to the Musculocutaneous n.?

Answer 57

Unable to flex the elbow loss of sensation to medial forearm