ANAT lab muscles Region 3 and 4
Deltoid muscle origin and insertion? Action?
Origin: Acromion process (of the clavicle), and the spine of the scapula. Insertion: Deltoid tuberosity (of the humerus.) Action: Abduct arm.
Brachialis muscle origin and insertion? Action?
Origin: Anterior diaphysis of the humerus Insertion: Ulnar tuberosity and coronoid process of ulna Action: Flexes the forearm
Coracobrachialis muscle origin and insertion? Action?
Origin: Coracoid process (of scapula) Insertion: Medial surface of humerus Action: Flex, adduct arm
Teres Major muscle origin and insertion? Action?
Origin: Inferior angle of scapula Insertion: Distal to lesser tubercle (of the humerus) Action: Extend, adduct, medially rotate arm
Infraspinatus muscle origin and insertion? Action?
Origin: Infraspinous fossa Insertion: Middle part of greater tubercle (of the humerus) Action: Laterally rotate arm
Teres Minor muscle origin and insertion? Action?
Origin: Lateral border of scapula Insertion: Inferior part of the greater tubercle (of the humerus) Action: Laterally rotate arm
Subscapularis muscle origin and insertion? Action?
Origin: Subscapular fossa (of the scapula) Insertion: Lesser tubercle (of the humerus) Action: Medially rotates the arm
Supraspinatus muscle origin and insertion? Action?
Origin: Supraspinous fossa (of the clavicle) Insertion: Superior part of the greater tubercle (of the humerus) Action: Abducts the arm
Biceps Brachii muscle origin and insertion? Action?
Origin: long head origin: long head: supraglenoid tubercle (of the scapula); short head: coracoid process (of the scapula) Insertion: Radial tuberosity (of the radius) Action: flex forearm; supinate radius
Triceps brachii muscle origin and insertion? Action?
Origins (3): Long Head origin: infraglenoid tubercle (of the scapula). Lateral head origin: lateral and posterior diaphysis of humerus. Medial head origin: posterior diaphysis of humerus Insertion: Olecranon process (of the ulna) Action: Extends the forearm
Serratus anterior muscle action?
abduct, protract scapula
Pectoralis minor muscle action?
depress the scapula
Pectoralis major muscle action?
flex, adduct, and medially rotate the arm