Scapula/Humeral Muscles & Pec Region

Question 1

3 Origin for Trapezius

Answer 1

External Occipital Protuberance
Superior Nuchal Line
Spinous Processes of C7-T12

Question 2

3 Insertion of Trapezius

Answer 2

Acromion Process
Spine of Scapula
Lateral 1/3 of the Clavicle

Question 3

What is the innervation of trapezius?

Answer 3

Spinal accessory nerve CN XI

Question 4

What are the actions for trapezius?

Answer 4

• Upward rotation of the scapula
• Upper fibers elevate scapula
• Middle fibers retract scapula
• Lower fibers depress scapula
• Neck extension
• Ipsi-lateral side bending of the neck
• Contra-lateral rotation of the neck

Question 5

5 Origins for latissimus dorsi

Answer 5

Iliac Crest
Thoracolumbar Fascia
Inferior angle of the scapula
Lower 3-4 ribs
All the lumbar and sacral spinous processes

Question 6

What is the insertion of latissimus dorsi?

Answer 6

Floor of the intertubercular groove (bicipital groove)

Question 7

What is the innervation for latissimus dorsi?

Answer 7

Thoracodorsal nerve, C6-C8

Question 8

What are the actions for latissimus dorsi?

Answer 8

Shoulder extension, adduction, and internal rotation

Question 9

2 Origin of levator scapula

Answer 9

posterior tubercles, transverse processes of C1-C4

Question 10

Insertion of levator scapula

Answer 10

Superior angle of scapula

Question 11

Innervation of Levator Scapula

Answer 11

Dorsal scapular nerve C5

Question 12

What are 4 actions for levator scapula?

Answer 12

Scapular elevation
Scapular downward rotation
Ipsi-lateral sidebending
Rotation of the neck

Question 13

What is the origin of Rhomboids?

Answer 13

Spinous processess C7-T5

Question 14

Insertion of Rhomboids?

Answer 14

Medial scapular border

Question 15

Innervation of Rhomboids

Answer 15

Dorsal Scapular nerve C5

Question 16

Actions of Rhomboids?

Answer 16

Scapular retraction and downward rotation

Question 17

3 Origin of deltoid?

Answer 17

Scapular Spine
Acromion Process
Lateral 1/3 of Clavicle

Question 18

Insertion of deltoid?

Answer 18

Deltoid Tuberosity (Humerus)

Question 19

Innervation of Deltoid?

Answer 19

Axillary nerve C5-6

Question 20

Actions of Deltoid?

Answer 20

Shoulder Abduction
Anterior fibers flex and internally rotate
Posterior fibers extend
Externally rotate

Question 21

Origin of Supraspinatus?

Answer 21

Supraspinous fossa

Question 22

Insertion of supraspinatus?

Answer 22

Superior facet greater tubercle of humerus

Question 23

Innervation of supraspinatus?

Answer 23

Suprascapular nerve C5-6

Question 24

Action of supraspinatus?

Answer 24

Shoulder abduction

Question 25

Origin of infraspinatus?

Answer 25

Infraspinous fossa

Question 26

Insertion of infraspinatus?

Answer 26

Middle facet greater tubercle of humerus

Question 27

Innervation of infraspinatus?

Answer 27

Suprascapular nerve C5-6

Question 28

Action of infraspinatus?

Answer 28

External rotation of shoulder

Question 29

What is the origin of Tres Minor?

Answer 29

Lateral Border of Scapula

Question 30

What is the insertion of Tres Minor?

Answer 30

Inferior facet greater tubercle of humerus

Question 31

What is the innervation of Tres Minor?

Answer 31

Axillary nerve C5-6

Question 32

What is the action of Tres Minor?

Answer 32

External rotation of shoulder

Question 33

What is the origin of Subscapularis?

Answer 33

Subscapular fossa

Question 34

What is the insertion of Subscapularis?

Answer 34

Lesser tubercle of humerus

Question 35

What is the innervation of Subscapularis?

Answer 35

Upper and lower subscapular nerve C6-8

Question 36

What is the action of Subscapularis?

Answer 36

Internal rotation of humerus

Question 37

What is the origin of Tres Major?

Answer 37

Inferior angle of scapula

Question 38

What is the insertion of Tres Major?

Answer 38

Medial lip of intertubercular groove of humerus

Question 39

What is the innervation of Tres Major?

Answer 39

Lower subscapular nerve C6-8

Question 40

What are the actions of Tres Major?

Answer 40

Internal rotation

Adduction of the shoulder

Question 41

Origin for Pectoralis Major

Answer 41

Clavicular Head: Anterior aspect of the clavicle
Sternocostal Head: Anterior aspect of the sternum and the superior 6 costal cartilages
Abdominal Head: Aponeurosis of external oblique

Question 42

Insertion of Pectoralis Major

Answer 42

Lateral lip of the intertubercular groove of humerus

Question 43

Innervation for Pectoralis Major

Answer 43

Medial and lateral pectoral nerve C6-8

Question 44

Action for Pectoralis Major

Answer 44

Clavicular Head: Shoulder Flexion
Sternocostal Head: Should Extension
Abdominal Head: Horizontal Adduction

Question 45

Origin for Pectoralis Minor:

Answer 45

Ribs 3-5

Question 46

Insertion for Pectoralis Minor

Answer 46

Coracoid Process

Question 47

Innervation for Pectoralis Minor

Answer 47

Medial Pectoral nerve C8-T1

Question 48

Action for Pectoralis Minor

Answer 48

Scapula tipping, downward rotation, Protraction

Question 49

Origin for Serratus Anterior

Answer 49

Ribs 1-8

Question 50

Insertion for Serratus Anterior

Answer 50

Medial order of the scapula

Question 51

Innervation for Serratus Anterior:

Answer 51

Long Thoarcic Nerve C5-7

Question 52

Action for Serratus Anterior:

Answer 52

Scapular Protractiom upward rotation

Question 53

Subclavius Origin:

Answer 53

1st Rib

Question 54

Insertion for Subclavius

Answer 54

Inferior aspect of middle clavicle

Question 55

Innervation for subclavius

Answer 55

Nerve to subclavius C5-6

Question 56

Action for Subclavius

Answer 56

Aid in respiration, prevent lateral displacment of the clavicle