Forelimbs Flashcards
Origin of subclavius
Sternum and costal cartilages 1-4
Insertion of subclavius
Blends with supraspinatus and shoulder fascia
Action of subclavius
Suspends trunk; stabilizes shoulder joint
Innervation of subclavius
Cranial pectoral nerves
Origin of supraspinatus
Supraspinous fossa, scapular cartilage and spine
Insertion of supraspinatus
Greater and lesser tubercles of the humerus
Action of supraspinatus
Extends and stabilizes the shoulder joint
Innervation of supraspinatus
Suprascapular nerve
Origin of infraspinatus
Infraspinatus fossa, scapular cartilage and spine
Insertion of infraspinatus
Fleshy of greater tubercle of humerus; strong tendon to lat. surface of greater tubercle distal to lat. insertion of supraspinatus
Action of infraspinatus
Extends and flexes the shoulder joint; functions as lat. contractile ligament
Innervation of infraspinatus
Suprascapular nerve
Origin of superficial pectorals
(Transverse)
(transverse) costal cartilages 1-6 and adjacent sternum
Origin of superficial pectorals
(Descendens)
(descendens) manubrium sterni
Origin of superficial pectorals
(Deep)
(deep) Sternum; distally on ribs 4-9; tunica flava abdominis
Insertion of superficial pectorals (Transverse)
Forearm fascia
Insertion of superficial pectorals (Descendens)
Deltoid tuberosity and crest of humerus
Insertion of superficial pectorals (Deep)
Major and minor tubercles of humerus; tendon of origin of coracobrachialis
Action of superficial pectorals (transverse & descendens )
Connect the forelimb with trunk; adduct, protract and retract forelimb
Action of superficial pectorals (deep)
Suspends trunk between forelimbs; retracts limb; stabilizes shoulder joint
Innervation of superficial pectorals
Cranial and caudal pectoral nerves
Origin of long head of triceps
Long head: caudal border of the scapular
Origin of lateral head of triceps
Lateral head: deltoid tuberosity and vicinity
Insertion of Triceps brachii
Olecranon tuber (underlain by small bursa)
Action of Triceps brachii
Extends elbow joint, its long head also flexes shoulder joint
Innervation of triceps brachii
Radial nerve
Origin of biceps brachii
Supraglenoid tubercle
Insertion of biceps brachii
Radial tuberosity; medial collateral ligament; via lacertus fibr. On tendon of extensor carpi radialis
Action of biceps brachii
Extensor of the shoulder joint; flexor of elbow joint; via lactus fibr. Stabilizer of carpus (in stay-apparatus)
Innervation of biceps brachii
Musculocutaneous nerve
Origin of deltoideus
Clavicular part: Clavicular inscription
Scapular part: Aponeurotically from scapular spine; fleshy from caudal border of scapula
Insertion of deltoideus
Clavicular part: crest of humerus
Scapular part: deltoid tuberosity
Action of deltoideus
Advances limb and flexes shoulder joint
Innervation of deltoideus
Axillary nerve