SA Thoracic Limb - Muscles and VANs Flashcards
Long Head of Triceps Brachii m.
O: Caudal Border of Scapula
I: Olecranon
A: Flex Shoulder; Extend Elbow
Inn: Radial N.
Art: Deep Brachial A.
Deltoideus m. (2H)
O: Scapula Spine; Acromion
I: Deltoid Tuberosity
A: Flex shoulder
Inn: Axillary N.
Art: Caudal Circumflex Humeral A.
Teres Major m.
O: Caudal border of the scapula
I: Teres Major tuberosity
A: Flex shoulder
Inn: Axillary n.
Art: Cd. Circumflex Humeral a.; Thoracodorsal a.
Teres Minor m.
O: Cd. border of scapula
I: Teres Minor tuberosity
A: Flex shoulder
Inn: Axillary n.
Art: Subscapular a.; Cd. Circumflex Humeral a.
Biceps Brachii m.
O: Supraglenoid tubercle
I: Radial Ulnar Tuberosity
A: Extend shoulder; flex elbow
Inn: Musculocutaneous n.
Art: Bicipital a., Cr. Circumflex Humeral a.
Coracobrachialis m.
O: Corocoid process
I: Crest of the Lesser Tubercle
A: Extend shoulder
Inn: Musculocutaneous n.
Art: Cr. Circumflex Humeral a.
Subscapularis m.
O: Subscapular fossa
I: Lesser tubercle
A: Extend shoulder
Inn: Subscapular n., Axillary n.
Art: Subscapular a.
Supraspinatus m.
O: Supraspinous fossa
I: Greater Tubercle
A: Extend shoulder
Inn: Suprascapular n.
Art: Subscapular a., Cd. Circumflex Humeral a.
Infraspinatous m.
O: Infraspinous fossa
I: Greater tubercle
A: extend shoulder
Inn: Suprascapular n.
Art: Subscapular n., Cd. Circumflex Humeral a.
Brachialis m.
O: Lateral border of humerus
I: Radial ulnar tubercle
A: Flex shoulder
Inn: Musculocutaneous n.
Art: Bicipetal a., Cr. Circumflex Humeral a.
Triceps brachii mm. (4H)
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.
Anconeus m.
O: Lateral and Medial Epicondyle
I: Olecranon
A: extend elbow
Inn: Radial n.
Art: Deep brachial a.
Tensor fascia antebrachium m.
O: Latissimus dorsi m.
I: Olecranon
A: Extend elbow
Inn: Radial n.
Art: Common interosseous and Deep Brachial aa.
Extensor Carpi Radialis m.
O: Lateral Supracondyle Crest
I: Dorsal Metacarpus I/II
A: Extend carpus
Inn: Radial n.
Art: Radial a.
Common Digital Extensor m.
O: Lateral epicondyle
I: Extensor of Distal Phalanges
A: Extends carpus and digits
Inn: Radial n.
Art: Radial a.
Lateral Digital Extensor m.
O: Lateral epicondyle
I: Extensor process of III-V
A: Extends carpus + digits III-V
Inn: Radial n.
Art: Radial a.
Ulnaris Lateralis m.**
O: Lateral epicondyle
I: Accessory carpal/Lateral Digit V
A: Flex carpus
Inn: Radial n.
Art: Radial a.
Flexor carpi ulnaris m. (2H)
O: Olecranon (Ulnar), Medial Epicondyle (Humerus)
I: Accessory carpal
A: Flex carpus
Inn: Ulnar n.
Art: Deep antebrachial a.
Superficial digital flexor m.
O: Medial epicondyle
I: Palmar bones of middle phalanx II-IV
A: Flex carpus
Inn: Median and Ulnar nn.
Art: Deep antebrachial a.
Deep digital flexor m. (3H)
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.
Flexor carpi radialis m.
O: Medial epicondyle
I: palmar metacarpal
A: Flex carpus
Inn: Median n.
Art: Deep antebrachial a.
What are the 5 veins of the thoracic limb? (CAMBM)
Cephalic v.
Accessory cephalic v.
Median cubital v.
Brachial v.
Median v.
What area does the Subclavian a. supply blood to?
Inside the thorax
What are the 4 main arteries of the thoracic limb? (SABM)
Subclavian a.
Axillary a.
Brachial a.
Median a.
External Thoracic a.
Supplies blood to the superficial pectoral
Lateral Thoracic a.
Supplies blood to the Deep pectoral AND houses the axillary lymph node
Subscapular a.
Supplies blood to the Scapular region (entire shoulder); Has 2 branches –> Cd. Circumflex Humeral a. and Thoracodorsal a.
Caudal Circumflex Humeral a.
Supplies blood to the Teres major and Shoulder region
Thoracodorsal a.
Supplies blood to the Latissimus dorsi and Teres Major
Cranial Circumflex Humeral a.
Supplies blood to the biceps (cranial humerus)
Deep brachial a.
Supplies blood to the Triceps brachii mm.
Bicipital a.
Supplies blood to the Biceps
Collateral Ulnar a.
Supplies blood to the caudal elbow
Transverse Cubital a.
Supplies blood to the cranial elbow (RMBR “cubit” = Elbow)
Common Interosseous a.
Supplies blood to the Radius and Ulna (runs between the two bones)
Deep antebrachial a.
Supplies blood to the flexors of the carpus
Radial a.
Supplies blood to the dorsal manus and extensors
Cranial Pectoral n.
Innervates the superficial pectoral m.
Caudal pectoral n.
Innervates the deep pectoral m.
Lateral thoracic n.
Innervates the cutaneous trunci m. (responsible for the panniculus reflex)
Suprascapular n.
Innervates the Supraspinatus and Infraspinatus muscles
Subscapularis n.
Innervates the Subscapularis
Thoracodorsal n.
Innervates the Latissimus dorsi
Musculocutaneous n.
Extends the shoulder; flexes the elbow
Innervates the:
Biceps brachii
Brachialis
Coracobrachialis
Axillary n.
Flexes the shoulder
Innervates the:
Subscapularis
Teres major
Teres minor
Deltoideus
Radial n.
Extends elbow and carpus
Innervates ALL elbow and carpus extensors (TAT and ECLU)
Median n.
Flexes the carpus and manus; communicates with the musculocutaneous n.
Innervates the:
Flexor carpi radialis
SDF
DDF
Ulnar n.
Flexes carpus and manus; provides sensory to the 5th digit
Innervates the Flexor carpi ulnaris and DDF
Brachial Plexus
Ventral branches of spinal nerves C6-T2
Which nerve is responsible for the autonomous zone of the 5th digit
Ulnar n.
Which nerve is responsible for the autonomous zone of the dorsal antebrachial region?
Radial n.
Which nerve is responsible for the autonomous zone of the medial brachium?
Musculocutaneous n.
What would be the effect of damage to the proximal Radial n.?
Loss of ability to extend the elbow, carpus, and digit;
unable to support weight on the forelimb
What would be the effect of damage to the distal Radial n.?
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
What would be the effect of damage to the Median and Ulnar nerves?
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)
What would be the effect of damage to the Axillary n.?
Unable to flex shoulder (loss of stability) leading to a “dropped” shoulder
loss of sensation to the lateral brachium and caudal scapular
What would be the effect of damage to the Musculocutaneous n.?
Unable to flex the elbow
loss of sensation to medial forearm
