Lab 3- Shoulder and Girdle Muscles

Name, origin, insert,

Subscapularis, originates from subscapular fossa, inserts in lesser tubercle of humerus, internal rotation,

Name, origin, insert, function

Supraspinatus, orginates from supraspinous fossa, inserts in superior greater tubercle, abduction

Name, origin, insert, function

Infraspinatus, originates in infraspinous fossa, inserts in posterior inferior greater tubercle, external rotation, horizontal abduction

Name, origin, insert, function

Teres Minor, originates in lateral border of scapula, inserts in posterior inferior greater tubercle, external rotation, horizontal abduction

Parts of rotator cuff

Subscapularis, Supraspinatus, Infraspinatus, Teres minor

Name, origin, insert, function

Serratus Anterior, inserts medial border of scapula, originates in superior borders 1-9 ribs, protraction,

Name, origin, insert, function

Rhomboid Minor, originates at spinal processes, inserts at root of spine of scapula,

downward rotation, protraction

Name, origin, insert, function

Rhomboid major, originates spinal processes, inserts medial border, downward rotation, retraction

Name, origin, insert, function

Subclavius, originates 1st rib, inserts in interior surface of clavicle, depression

Name, origin, insert, function

Levator scapulae, originates transverse processes, inserts in medial border of scapulae, downward rotation, elevation

Name, origin, insert, function

Deltoid: Three Parts

Anterior/ Clavicle: Originates in spine of scapula, abduction, flexion, horizontal adduction

Middle/ Acromial: Originates in lateral third of clavicle, abduction, horizontal abduction

Posterior/ spinal: Originates in acromion, abduction, horizontal abduction, extension,

Inserts: Deltoid tuberosity

Name, origin, insert, function

Coracobranchalis, orginates in coracoid process, inserts in medial mid-shaft of humerus, horizonral adduction, adduction

Name, origin, insert, function

Teres Major, Originates in inferior angle of scapula, inserts in intertubercular, internal rotation, adduction, extension

Intrinsic Glenohumeral Muscles

Deltoid, Coracobrachialis, Teres Major

Name, origin, insert, function

Latissimus Dorsi, originates spinous processes and inferior angle of scapula, inserts intertubercular, internal rotation, adduction, extension,

Name, origin, insert, function

Pectoralis Major, 2 parts

Sternal part: originates medial half of clavicle, inserts in intertubercular, adduction, internal rotation, horizontal adduction

Clavicle Part: originates sternum, inserts in intertubercular, abduction, flexion, internal rotation, horizontal adduction

Extrinisic Glenohumeral Muscles

Latissimus Dorsi and Pectoralis Major

Name, origin, insert, function

Pectoralis Minor, originates 3rd-5th ribs, inserts on coracoid process, protraction, depression, downward rotation

1: Name, origin, insert, function

upper trapezius : originates at occipital bone, inserts at 3rd of clavicle, elevation, upward rotation

2: Name, origin, insert, function

Middle: originates at spinal processes, inserts at spine of scapula, retraction

3: Name, origin, insert, function

Lower, originates at spinal processes, inserts at acromion, depression, upward rotation