Origins
Origin of the subscapularis
Subscapular fossa
Action of the deep digital flexor
Flex carpal, metacarpo-phalangeal, proximal and distal interphalangeal joints
Supplies latissimus dorsi, deep pectoral, cutaneous trunci, and thoracic mammae
Lateral thoracic artery
Innervate the superficial pectoral muscles
Cranial pectoral nerves
Not present in horse scapula
Acromion
Origin of superficial pectorals
sternum
Action of the triceps brachii
Extend the elbow joint, flex the shoulder joint (long head only)
Supplies triceps, ulnar nerve, and elbow
Collateral ulnar artery
Innervates coracobrachialis, biceps brachii, and brachialis
Musculocutaneous nerve
Metacarpals present in bovine
III and IV
Origin of the deltoideus
Spine of scapula
Action of the brachialis
Flex the elbow joint
Supplies flexor carpi radialis, deep digital flexor, flexor carpi ulnaris, and superficial digital flexor
Deep antebrachial artery
Innervates pronator teres, pronator quadratus, flexor carpi radialis, superficial digital digital flexor, radial and parts of ulnar heads of deep digital flexor
Median nerve
Third pectoral muscle in the horse
Subclavius
Origin of the biceps brachii
Supraglenoid tubercle
Action of the superficial pectorals
Adduct limb when not bearing weight, prevent abduction when bearing weight
Supplies ulnar and humeral heads of the deep digital flexor, and the flexor carpi ulnaris
Ulnar artery
Innervates extensors of elbow, carpus, and digital joints
Radial nerve
Equine and Bovine scapulas have this structure NOT present in the canine scapula
Tuber spinae
Origin of the extensor carpi radialis
Lateral supracondylar crest of humerus
Action of the rhomboideus
Elevates forelimb and draws scapula against trunk
Supplies elbow and adjacent muscles
Transverse cubital artery
Innervates teres major, teres minor, deltoideus, and part of subscapularis
Axillary nerve
The median nerve shares a common trunk with which nerve in the dog? And what about the horse?
Ulnar in dog, musculocutaneous in horse