Thoracic Limb Intrinsic Muscles Flashcards
(35 cards)
The _____ of a muscle is the more fixed point of muscle attachment, whereas the _____ is the more moveable point of muscle attachment.
- Origin
- Insertion
An _____ muscle of the thoracic limb is one that has both its origin and insertion on the bones of the thoracic limb
Intrinsic
_____ is an increase in the angle of a joint, and ____ is a decrease in the angle of a joint. The ____ surface is the side of a joint that will decrease in angle upon the contraction of a muscle.
- Extension
- Flexion
- Flexor
What is the action of the deltoideus?
To flex the shoulder
What is the action of the infraspinatus?
Abducts the shoulder
What is the action of the teres minor?
Flexion of the shoulder joint
What is the action, origin, and insertion of the supraspinatus?
- Action: Extension of the shoulder joint
- Origin: the supraspinous fossa
- Insertion: The greater tubercle of the humerus
What is the action of the subscapularis?
To adduct the shoulder joint
What is the action, origin, and insertion of the teres major?
Action: Flex the shoulder
Origin: Caudal angle/border of the scapula
Insertion: Teres major tuberosity of the humerus
What is the action of the coracobrachialis?
To adduct the shoulder joint
The _____ ______ _____ is a synovial fluid filled sac that will reduce friction of the muscle tendon as it glides over the humerus.
Subtendinous Synovial Bursa
What is the action of the tensor fasciae antebrachii?
To extend the elbow
What is the origin, insertion, and action of the triceps brachiii long head?
Origin: the caudal border of the scapula
Insertion: The olecranon tuber of the ulna
Action: Extend the elbow
What is the origin, insertion, and action of the lateral head of the triceps brachii?
-Origin: Tricipital line of the humerus
-Insertion: Olecranon tuber of the ulna
Action: To extend the elbow
What is the Action, origin, and insertion of the triceps brachii accessory head?
Action: To extend the elbow
Origin: The neck of the humerus
Insertion: The olecranon tuber of the ulna
What is the action, origin, and insertion of the medial head of the triceps brachii?
Action: To extend the elbow
Origin: The crest of the lesser tubercle of the humerus
Insertion: The olecrennon tuber of the ulna
The _____ is the only muscle that must be transected for a surgical approach to the elbow joint?
Anconeus
What is the action of the anconeus?
To extend the elbow
What is the action, origin, and insertion of the biceps brachii?
Action: Flex the elbow
Origin: The supraglenoid tubercle of the scapula
Insertion: The ulnar and radial tuberosities
The ______ _____ ____ holds the biceps brachii tendon of origin in place as it passes through the ____ ____.
- Transverse humeral retinaculum
- intertubercular groove
What is the action of the brachialis?
To flex the elbow
What is the action, origin, and insertion of the extensor carpi radialis?
Action: to extend the carpus
Origin: the lateral supracondylar crest of the humerus
Insertion: Dorsal surface of the base of metacarpals II and III
What is the action, origin, and insertion of the common digital extensor?
Action: to extend the carpus and digits
Origin: The lateral epicondyle of the humerus
Insertion: The extensor processes of the distal phalanges II-V
What is the action of the lateral digital extensor?
To extend the carpus
