Muscle Anatomy: Origins, Insertions, and Actions

Vocabulary flashcards detailing origins, insertions, and actions for upper body and shoulder muscles based on the lecture notes.

Serratus Anterior

Origin: Upper 8 ribs. Insertion: Medial border of scapula (costal surface). Action: Scapular protraction and stabilization.

Pectoralis Major

Origin: Clavicle, Sternum. Insertion: Bicipital groove. Action: Shoulder Adduction, Medial Rotation, and flexion.

Pectoralis Minor

Origin: Ribs 3-5. Insertion: Coracoid process of Scapula. Action: Scapular Stabilization and rib expansion with inspiration.

Biceps Brachii

Origin: Short head - Coracoid process of Scapula; Long head - Supraglenoid tubercle. Insertion: Radial Tuberosity & bicep aponeurosis. Action: Elbow & Shoulder Flexion, Supination.

Coracobrachialis

Origin: Coracoid process. Insertion: Medial Humerus. Action: Shoulder Flexion and Adduction.

Latissimus Dorsi

Origin: Posterior spinous process of T7-T12, Thoracolumbar fascia, iliac crest, inferior angle of Scapula. Insertion: Intertubercular groove of humerus. Action: Adducts, Extends, and Internal Rotation.

Teres Major

Origin: Inferior angle of Scapula. Insertion: Intertubercular groove of humerus. Action: Shoulder Adduction and Internal Rotation.

Teres Minor

Origin: Lateral border of Scapula. Insertion: Greater Tubercle of humerus. Action: Shoulder external rotation and Stabilization.

Supraspinatus

Origin: Supraspinatus Fossa of Scapula. Insertion: Greater tubercle of humerus. Action: Shoulder abduction and Stabilization.

Infraspinatus

Origin: Infraspinous Fossa of scapula. Insertion: Greater Tubercle of humerus. Action: Shoulder external rotation and Stabilization.

Subscapularis

Origin: Subscapular fossa. Insertion: Lesser Tubercle of humerus. Action: Internal Rotation and Stabilization of the shoulder.

Rhomboids

Origin: Spinous process of vertebra C7-T5. Insertion: Medial border of scapula. Action: Scapular Retraction.

Deltoid

Origin: Clavicle, Spine of Scapula, acromion process. Insertion: Deltoid Tuberosity. Action: Shoulder abduction, flexion, and extension.

Triceps Brachii

Origin: Long head - Infraglenoid Tubercle; Lateral head - above the radial sulcus; Medial head - below the radial sulcus. Insertion: Olecranon Process. Action: Elbow & Shoulder Extension.

Trapezius

Origin: Spinous process C7-T12, Occipital bone. Insertion: Clavicle, acromion, Spine of Scapula. Action: Retractions, Elevation, and Depression of Scapula.