Muscles of Shoulder Girdle Chapter 4

Movements of the Scapula 1. Elevation 2. Depression 3. Adduction (retraction) 4. Abduction (protraction) 5. Downward rotation 6. Upward rotation

Anterior Muscles Pectoralis Minor Serratus Anterior

Pectoralis Minor Origin: Anterior surface of 3, 4, and 5 ribs Insertion: Coracoid process Actions: Abduction of the scapula Downward rotation of the scapula Depression of the scapula

Serratus Anterior Origin: Lateral surface of upper 8 ribs Insertion: Anterior surface of medial border and inferior angle of scapula. Actions: Abduction of the scapula Upward Rotation of the scapula

Posterior Muscles Levator Scapluae Trapezius Rhomboid

Levator Scapulae Origin: Transverse processes of the first 4 cervical vertebrae. Insertion: Superior angle and medial border of the scapula. Actions: Elevation of the scapula

Trapezius Origin: Occipital bone, ligamentum nuchae, spinous process of the C7 and all Thorasic vertebrae Insertion: 1. Lateral 1/3 of clavicle. 2. Top of Acromion process. 3. Upper border of spine of the scapula. 4. Medial surface of spine of the scapula. Actions: Upper – elevation of the scapula Middle – elevation, upward rotation, & adduction of the scapula Lower – depression, AC adduction and upward rotation of the scapula

Upper – elevation Middle – elevation, upward rotation, & adduction Lower – depression, adduction and upward rotation

Pull of the lower fibers Movement of scapula

Rhomboid (major and minor) Origin: Ligamentum nuchea and spinous process of C1-7 and 2-5 T Insertion: Medial border of the scapula Actions: Adduction of the scapula Downward rotation of the scapula Elevation of the scapula

Subclavius Origin: Superior aspect of first rib Insertion: Inferior aspect at mid-clavicle Action Depression of the scapula Stabilization of the scapula

Scapula Adduction Abduction Upward Rotation Downward Rotation Trap (middle) Pect Minor Serratus Ant. Trap (lower) Rhomboid Rhomboids

Name the muscle. Rhomboid Name the action Adduction of scapula

Name the muscle. Pectoralis minor Name the action Depression of the scapula

Name the muscle. Trapezius Name the action Adduction of the scapula Name the action Upward rotation

Name the muscle. Levator scapula Name the action Elevation of the scapula

Name the muscle. Serratus Anterior Name the action Abduction of scapula

? Latissimus Dorsi