Intrinsic muscles Flashcards
Deltoideus
O: Spine and acromial process of scapula
I: deltoid tuberosity
A: Flex the shoulder
I: Axillary nerve
Supraspinatus
O: Supraspinous fossa
I: Greater tubercle
A: extend and laterally stabilize shoulder joint
I: Suprascapular nerve
Infraspinatus
O: infraspinous fossa
I: Greater tubercle
A: extends shoulder
I: Suprascapular nerve
Suprascapularis
O: Subscapular fossa
I: lesser tubercle
A: to extend the elbow, stabilize the joint and to adduct the shoulder
I: Subscapular N
Teres major
O: cd. angle + border of scapula
I: teres major tuberosity
A: flex the shoulder; rotates shoulder medially; prevents lateral rotation (weight bearing)
I: Axillary nerve
Coracobrachialis
O: Coracoid process of scapula
I: crest of lesser tubercle
A: Adduct, extend and stabilize the shoulder joint
I: Muscolocutaneous nerve
Teres minor:
O: Infraglenoid tubercle
I: tere minor tuberosity
A: Flex shoulder joint, rotate shoulder laterally, prevents medial rotation
I: Axillary nerve
Biceps Brachii
O: supraglenoid tubercle
I: Ulnar and radial tuberostities
A: Flex the elbow, extend the shoulder
I: Musculocutaneous Nerve
Brachialis
O: proximal surface of the humerus
I: Ulnar and radial tuberostities
A: Flex the elbow
I: Musculocutaneous Nerve
Tensor Fasciae antebrachii
O: Fascia covering latissimus dorsi
I: Olecranon of the ulna
A: Extend the elbow
I: Radial Nerve
Triceps Brachii
O (Long Head): cd. scapula border
O (Lateral): Tricipital line of the humerus
O (Medial): crest of lesser tuberosity
O (accessory): neck of humerous
A: Extend the elbow joint
- Long head also flexs the shoulder joint
I: Radial nerve
Anconeus
O: The lateral supracondylar crest and the lateral and medial epicondyles of the humerus.
I: The lateral surface of the proximal end of the ulna (the olecranon).
A: To extend the elbow joint.
I: Radial nerve.
Pronator teres:
O: medial epicondyle of humerus
I: radius between proximal and middle thirds
A: to rotate the forearm medially so that the palmer side of the paw faces the ground
I: Median nerve
Pronator quadratus
apposed sides of the radius and ulna
A: pronation of the paw
I: Median nerve
Supinator
O: Lateral epicondyle of the humerus
i: cranial surface of the proximal fourth of the radius
A: To rotate the forearm laterally so that the palmar side of the paw faces medially
