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Glenohumeral Muscles

Origin, incestion and actions of the muscles of the shoulder girdle and shoulder

QuestionAnswer
Upper Trapezius Origin Occipital Bone Ligamentum nuchae Spinous processes of C7 -T4
Upper Trapezius Insertion Lateral Clavicle Acromion Superior border of spine of scapula.
Upper Trapezius Action Elevation of scapula Retraction of the scapula Upward rotation of scapula.
Lower Trapezius Origin SP of T4-T12
Lower Trapezius Insertion Inferior, medial half of spine of scapula.
Lower Trapezius Actions Depression of scapula Retraction of Scapula Downward Rotation of scapula
Levator Scapula Origin Transverse Processes of C1-C4
Levator Scapula Insertion Superior Angle of scapula
Levator Scapula Action Elevates the scapula
Rhomboid Major Origin SP of T1-15
Rhomboid Major Insertion Medial border of scapula above and including inferior angle.
Rhomboid Major Action Retraction of scapula Elevation of scapula
Rhomboid Minor Origin SP of C6-T1
Rhomboid Minor Insertion Medial border of scapula above and including root of spine
Rhomboid Minor Action Retraction of scapula Elevation of scapula
Serratus Anterior Origin Anterolateral surface of upper 9 ribs
Serratus Anterior Insertion Costal Surface of medial border of scapula.
Serratus Anterior Action Protracts the scapula
Pectoralis Minor Origin Anterior surfaces of 3rd, 4th, and 5th ribs.
Pectoralis Minor Insertion Coracoid process of the scapula
Pectoralis Minor Action Depression of scapula Elevates the ribs
Pectoralis Major Origin Medial half of the clavicle Sternum Abdominal aponeurosis
Pectoralis Major Insertion Bicipital groove of the humerus.
Pectoralis Major Action Adduction of humerus at the shoulder Flexion of the humerus Medial rotation of the humerus Horizontal adduction of the humerus
Coracobrachialis Origin Caracoid process of the scapula
Coracobrachialis Insertion Middle 1/3 medial surface of the humerus.
Coracobrachialis Action Flexion of the humerus at the shoulder Adduction of the humerus at the shoulder Horizontal adduction of the humerus at the shoulder
Teres Major Origin Dorsal surface of lower axillary border of scapula
Teres Major Insertion Bicipital groove of the humerus
Teres Major Action Adduction of the humerus at the shoulder. Medial rotation of the humerus at the shoulder.
Deltoid (anterior) Origin Lateral half of the clavicle
Deltoid (anterior) Insertion Deltoid tuberosity of the humerus
Deltoid (anterior) Action Abduction of the humerus Horizontal adduction of the humerus Medial rotation of the humerus Flexion of the humerus
Deltoid (middle) Origin Acromion process of the scapula
Deltoid (middle) Insertion Deltoid tuberosity of the humerus
Deltoid (middle)Action Abduction of the humerus at the shoulder
Deltoid (posterior) Origin Spine of scapula
Deltoid (posterior) Insertion Deltoid tuberosity of the humerus
Deltoid (posterior) Action Abduction of the humerus Horizontal abduction of the humerus Extension of the humerus Lateral rotation of the humerus
Latissimus Dorsi Origin Thoraculmbar aponeurosis from T7 to the iliac crest Lateral surfaces of the lower 4 ribs
Latissimus Dorsi Insertion Bicipital groove of the humerus
Latissimus Dorsi Action Extension of the humerus Medial rotation of the humerus Adduction of the humerus.
Supraspinatus Origin Supraspinous fossa of the scapula
Supraspinatus Insertion Greater tubercle of the humerus
Supraspinatus Action Abduction of the humerus at the shoulder. Stabilizes the shoulder joint.
Teres Minor Origin Dorsal surface of axillary border of the scapula
Teres Minor Insertion Greater tubercle of the humerus
Teres Minor Action Lateral rotation of the humerus Stabilizes the shoulder joint
Infraspinatous Origin Infraspinatous Fossa of the scapula
Infraspinatous Insertion Greater tubercle of the humerus
Infraspinatous Action Lateral rotation of the humerus Stabilizes the shoulder joint
Subscapularis Origin Subscapular fossa
Subscapularis Insertion Lesser tubercle of the humerus
Subscapularis Action Medial rotation of the humerus Stabilizes the shoulder joint
Created by: JPZepeda
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