Shoulder Muscle Origin & Insertion

Question 1

Serratus anterior

Answer 1

Origin: Outer surface of 8-10th ribs, fascia of surrounding muscles
Insertion: Costal surface of medial border of scapula (superior to medial angle)

Question 2

Levator scaplae

Answer 2

Origin: C1-C4 transverse process
Insertion: Medial border of scapula, between superior angle and root of spine

Question 3

Upper Trapezius

Answer 3

Origin: Medial ⅓ of superior nuchal line, Ext. occipital protuberance, ligamentum nuchae
Insertion: Posterior border of lateral ⅓ of clavicle

Question 4

Middle Trapezius

Answer 4

Origin: T1-T5 spinous process
Insertion: Medial border of acromion process, superior border of spine of the scapula

Question 5

Lower Trapezius

Answer 5

Origin: T6-T12 spinous process
Insertion: Tupercle at medial end of spine of scapula

Question 6

Rhomboid minor

Answer 6

Origin: Ligamentum nuchae, C7-T1 spinous process
Insertion: Base of triangular region at root of spine of scapula

Question 7

Rhomboid major

Answer 7

Origin: T2-T5 spinous process
Insertion: Medial border of scapula between root of spine and inferior angle

Question 8

Anterior deltoid

Answer 8

Origin: Anterior border of lateral ⅓ of clavicle
Insertion: Deltoid tuberosity on humerus

Question 9

Middle deltoid

Answer 9

Origin: Lateral border and superior surface of acromion
Insertion: Deltoid tuberosity on humerus

Question 10

Posterior deltoid

Answer 10

Origin: Inferior lip of spine of scapula
Insertion: Deltoid tuberosity

Question 11

Supraspinatus

Answer 11

Origin: Medial ⅔ of supraspinatus fossa
Insertion: Superior facet of greater tuberosity

Question 12

Coracobrachialis

Answer 12

Origin: Tip of coracoid process
Insertion: Middle of medial aspect of shaft of humerus

Question 13

Pectoralis major (clavicular head)

Answer 13

Origin: Medial ⅓ of clavicle
Insertion: Lateral lip of intertubercular groove of humerus

Question 14

Pectoralis major (sternal head)

Answer 14

Origin: Medial half of anterior surface of sternum
Insertion: Lateral lip of intertubercular groove of humerus

Question 15

Pectoralis minor

Answer 15

Origin: Outer surface of 2-4 or 3-5 ribs near costal cartilage
Insertion: Coracoid process of the scapula

Question 16

Subscapularis

Answer 16

Origin: Medial ⅔ of subscapularis fossa
Insertion: Lesser tuberosity of humerus, anterior aspect of joint capsule

Question 17

Infraspinatus

Answer 17

Origin: Medial ⅔ of infraspinous fossa
Insertion: Middle facet of greater tuberosity

Question 18

Teres minor

Answer 18

Origin: Upper ⅔ of lateral aspect of dorsal surface of scapula
Insertion: Inferior facet of greater tuberosity

Question 19

Teres major

Answer 19

Origin: Posterior surface of inferior angle of scapula
Insertion: Medial lip of intertubercular groove of humerus

Question 20

Latissimus dorsi

Answer 20

Origin: Lumbar and spinous process, posterior aspect of crest of ilium, spines of T7-T12, lower 3-4 ribs, inferior angle of scapula
Insertion: Floor of intertubercular groove of humerus