Shoulder - Origin, Insertion

Question 1

Anterior deltoid

Answer 1

O – lateral 1/3 of clavicle

I – deltoid tubercle of humerus

Question 2

Middle deltoid

Answer 2

O – lateral border of acromion

I – deltoid tubercle of humerus

Question 3

Posterior deltoid

Answer 3

O – spine of scapula

I – deltoid tubercle of humerus

Question 4

Pectoralis major

***2 heads of origin - one insertion point

Answer 4

Clavicular head O – anterior medial 1/2 of clavicle

Sternocostal head O – ant surface of sternum and superior 6 costal cartilages

I – lateral to intertubercular groove of humerus

Question 5

Pectoralis minor

Answer 5

O – ribs 3-5

I – medial side of coracoid process of scapula

Question 6

Sternocleidomastoid

***2 heads of origin - one insertion point

Answer 6

Sternal head O – upper part of anterior surface of manubrium

Clavicular head O – sup surface of medial 1/3 of clavicle

I – lateral surface of mastoid process of temporal bone, superior nuchal line

Question 7

Upper trapezius

Answer 7

O – EOP, nuchal line and ligamentum nuchae

I – post aspect of lat 1/3 of clavicle

Question 8

Middle trapezius

Answer 8

O – ligamentum nuchae

I – medial aspect of acromion

Question 9

Lower trapezius

Answer 9

O – T1-T12

I – spine of scapula

Question 10

Subclavius

Answer 10

O – costochondral junction of 1st rib

I – subclavian groove of clavicle

Question 11

Serratus anterior

Answer 11

O – external surface of lateral parts of ribs 1-8

I – ant surface of medial border of scapula

Question 12

Latissimus dorsi

Answer 12

O – SP T6-T12, thoracolumbar fascia (L1-L5, posterior aspect of iliac crest)

I – floor of intertubercular groove of humerus (passes medial to humerus to get there)

Question 13

Levator scapulae

Answer 13

O – transverse processes of C1-C4

I – superior angle and sup part of medial border of scapula

Question 14

Rhomboid minor

Answer 14

O – lower part of ligamentum nuchae and spinous processes of C7-T1

I – sup to rhomboid major on medial border scapula

Question 15

Rhomboid major

Answer 15

O – spinous processes of T2-T5

I – inferior aspect of medial border of scapula

Question 16

Teres major

Answer 16

O – posterior surface of inf angle of scapula

I – medial to intertubercular groove of humerus

Question 17

Teres minor

Answer 17

O – middle 1/2 of lateral border of scapula

I – inferior facet of greater tubercle of humerus

Question 18

Supraspinatus

Answer 18

O – supraspinous fossa

I – sup facet of greater tubercle

Question 19

Infraspinatus

Answer 19

O – infraspinous fossa

I – middle facet of greater tubercle

Question 20

Subscapularis

Answer 20

O – subscapular fossa

I – lesser tubercle of humerus

Question 21

Identify the 4 mm that **originate from the clavicle **

Answer 21

1. Deltoid
2. Pectoralis major
3. SCM
4. Sternohyoid

Question 22

Identify the 2 mm that insert on the clavicle

Answer 22

1. Upper trapezius
2. Subclavius

Question 23

Superficial posterior mm (2)

Answer 23

1. Trapezius
2. Latissimus dorsi

Question 24

Deep posterior mm (2)

Answer 24

1. Levator scapular
2. Rhomboids

Question 25

Scapulohumeral mm (6)

Answer 25

1. Deltoid
2. Teres major
3. Supraspinatus
4. Infraspinatus
5. Teres minor
6. Subscapularis

Question 26

What 4 mm make up the rotator cuff

Answer 26

1. Supraspinatus
2. Infraspinatus
3. Teres minor
4. Subscapularis

Question 27

Subscapularis Inn.

Answer 27

Upper & lower subscapular N. (C5-C6)

Question 28

What clavicle landmark serves as the attachment site of the conoid portion of the coracoclavicular ligament

Answer 28

Conoid tubercle

Question 29

Attachment of trapezoid portion of coracoclavicular ligament

Answer 29

Trapezoid line of clavicle

Question 30

Insertion site of subclavius muscle

Answer 30

Subclavian groove (clavicle)

Question 31

Serves as the attachment (insertion) site for the subscapularis muscle

Answer 31

Lesser tubercle (tuberosity) of humerus

Question 32

Serves as an attachment for 3 of the 4 rotator cuff muscles

Answer 32

Greater tubercle (tuberosity)

Question 33

Arises from the lateral cord of the brachial plexus

Answer 33

Lateral pectoral n.

Question 34

Arises from the medial cord of the brachial plexus

Answer 34

Medial pectoral n.