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