Anatomy Flashcards
Nuchal Ligament:
Origin, Insertion, Action
O: First 3 thoracic SP
I: Dorsal SP C2
A: Support the head; prevent excessive ventroflexion
Supraspinatus:
Origin, Insertion, Action
O: supraspinous fossa
I: greater tubercle, ant to infra; thick tendon to free edge of greater tubercle
A: extend, advance limb; stabilize shoulder (largely stabilized by muscles acting as collateral ligaments)
Infraspinatus;
Origin, Insertion, Action
O: infraspinous fossa
I: lateral greater tubercle; btn supra and teres minor
A: extend shld; assists supra in NWB; flexion during WB; abduction; lateral rotation; stabilizes shld
Teres Minor:
Origin, Insertion, Action
O: distal 1/3 caudal border of scap
I: greater tubercle caudal to infra; prox to deltoid tubercle
A: flexes shld; ER humerus
Deltoideus: Spinous Head
Origin, Insertion, Action
O: spine of scap
I: Deltoid tuberosity
A: flexes shoulder
Deltoideus: Acromial Head
Origin, Insertion, Action
O: acromion
I: deltoid tuberosity
A: abducts humerus
Teres Major:
Origin, Insertion, Action
O:Caudal angle and border of Scapula
I: Teres major tuberosity
A: Flex Shoulder (draws humerus caudally); adduction; medial rotation
Subscapularis:
Origin, Insertion, Action
O: Subscapular Fossa of scapula
I: Minor tubercle of the humerus via thick, short strong tendon; unites with capsule
A: Adduction limb; extend shoulder; internal rotation (medial); stabilizes the joint during flexion (tendon functions as MCL of shoulder joint)
Canine Muscles of the Shoulder (6)
Supraspinatus, infraspinatus, teres minor, teres major, deltoideus, subscapularis
Anconeus:
Origin, Insertion, Action
O: Distal-lateral Humerus, just proximal to elbow
I: Lateral surface of proximal 1/8 of ulna
A: Extend elbow
(tenses antebrachial fascia)
Triceps Brachii: Medial head
Origin, Insertion, Action
O: Medial surface of the humerus
I: Olecranon
A: Extend Elbow
Triceps Brachii: Accessory
Origin, Insertion, Action
O: Neck of humerus
I: Olecranon
A: Extend Elbow
Triceps Brachii: Lateral Head
Origin, Insertion, Action
O: Proximal Lateral humerus
I: Olecranon
A: Extend Elbow
Triceps Brachii: Long Head
Origin, Insertion, Action
O: Caudal border of Scapula
I: Olecranon
A: Extend Elbow; Flex Shoulder
Biceps Brachii:
Origin, Insertion, Action
O: Supraglenoid tubercle of the scapula
I: Ulna and Radius, medially just distal to the elbow joint
A: Flex Elbow; Extend shoulder
Extensor Carpi Radialis:
Origin, Insertion, Action
O: Lateral epicondyle of the humerus
I: Bases (proximal end) of
MC 2 & 3
A: Extend Carpus; weakly flex the elbow
Common Digital Extensor:
Origin, Insertion, Action
O: Lateral epicondyle of the humerus
I: Extensor processes of the distal phalanges (P3) of digits 2-5
A: Extend carpus; Extend digits of the carpus (2-5)
Flexor Carpi Ulnaris: Ulnar Head
Origin, Insertion, Action
O: Caudal Border and medial surface of Olecranon
I: Accessory carpal bone
A: Flex carpus
Flexor Carpi Ulnaris: Humeral Head
Origin, Insertion, Action
O: Medial epicondyle of humerus
I: Accessory carpal bone
A: Flex carpus