Lecture 5 - Muscles Flashcards
What is the origin of supraspinatus?
supraspinanous fossa of scapula
What is the insertion of supraspinatus?
Greater tubercle of humerus
What is the nerve of supraspinatus?
Suprascapular n.
What is the action of supraspinatus?
Extend and laterally stabilize the shoulder joint
What is the origin of infraspinatus?
Infraspinous fossa of scapula
What is the insertion of infraspinatus?
lateral side of the greater tuberble of humerus
What is the nerve of infraspinatus?
Suprascapular n.
What is the action of infraspinatus?
Extend and laterally stabilize or flex the GH joint, abduct the shoulder, rotate shoulder laterally, lateral stability to shoulder joint
What does the infraspinatus do when the leg is weight bearing?
Prevents medial rotation
What is the origin of the scapular part?
Spine of scapula
What is the origin of the acromial part?
Acromion of scapula
What is the insertion of the deltoideus?
Deltoid tuberosity of humerus
What is the nerve of the deltoideus?
Axillary n.
What is the action of the deltoideus?
Flex the shoulder joint
What is the origin of the teres major?
caudal angle and adjacent caudal border of scapula, caudal surface of subscapularis
What is the insertion of the teres major?
Teres major tuberosity of the humerus
What is the nerve of the teres major?
Axillary n.
What is the action of the teres major?
Flex shoulder joint, rotate shoulder medially, and prevent lateral rotation when bearing weight
What is the origin of the teres minor?
infraglenoid tubercle and dorsal third of caudal border of scapula
What is the insertion of the teres minor?
teres minor tuberosity of humerus
What is the nerve of the teres minor?
axillary n.
What is the action of the teres minor?
Flex shoulder joint, rotate shoulder laterally, and prevent medial rotation when weight bearing
What is the origin of the subscapularis?
subscapular fossa of scapula
What is the insertion of the subscapularis?
lesser tubercle of humerus
What is the nerve of the subscapularis?
subscapular n.
What is the action of the subscapularis?
Adduct, extend, and medially stabilize shoulder joint, rotate shoulder medially, when weight bearing prevent lateral rotation
What is the origin of the coracobrachialis?
coracoid process of the scapula
What is the insertion of the coracobrachialis?
Lesser tubercle of humerus, proximal to teres major tuberosity
What is the nerve of the coracobrachialis?
Musculocutaneous n.
What is the action of the coracobrachialis?
Adduct, extend, and stabilize shoulder joint
What is the origin of the long head?
caudal border of scapula
What is the origin of the medial head?
crest of lesser tubercle
What is the origin of the accessory head?
neck of humerus
What is the origin of the lateral head?
tricipital lines of humerus
What is the insertion of the triceps brachii?
olecranon
What is the nerve of the triceps brachii?
Radial n.
What is the action of the triceps brachii?
Extend elbow and will also flex shoulder
What is the origin of the tensor fasciae antebrachii?
fascia covering lateral aspect of latissimus dorsi
What is the insertion of the tensor fasciae antebrachii?
olecranon (process)
What is the nerve of the tensor fasciae antebrachii?
Radial n.
What is the action of the tensor fasciae antebrachii?
Extend elbow
What is the origin of the anconeus?
lateral supracondylar crest and the lateral medial epicondyles of the humerus
What is the insertion of the anconeus?
lateral end of olecranon (process)
What is the nerve of the anconeus?
Radial n.
What is the action of the anconeus?
Extend elbow
What is the origin of the biceps brachii?
supraglenoid tubercle of scapula
What is the insertion of the biceps brachii?
ulnar and radial tuberosities
What is the nerve of the biceps brachii?
musculocutaneous n.
What is the action of the biceps brachii?
Flex elbow and extend shoulder
What is the origin of the brachialis?
proximal third of lateral surface of humerus
What is the insertion of the brachialis?
ulnar and radial tuberosities
What is the nerve of the brachialis?
Musculocutaneous n.
What is the action of the brachialis?
Flex elbow
