Shoulder Complex

Question 1

Origin of Pectoralis Major

Answer 1

Clavicle,
sternum
upper six costal cartilages

Question 2

Insertion of Pectoralis Major

Answer 2

Lateral lip of the bicipital groove of humerus

Question 3

Innervation of Pectoralis Major

Answer 3

Medial and lateral pectoral nerves form brachial plexus

Question 4

Action of Pectoralis Major

Answer 4

Adducts arm and rotates it medially;
clavicular fibers also flex arm

Question 5

Origin of Pectoralis Minor

Answer 5

3rd, 4th and 5th ribs

Question 6

Insertion of Pectoralis Minor

Answer 6

Coracoid process of scapula

Question 7

Innervation of Pectoralis Minor

Answer 7

Medial pectoral nerve from the brachial plexus

Question 8

Action of Pectoralis Minor

Answer 8

Depresses point of shoulder;
if the scapula is fixed, it elevates the ribs of origin

Question 9

Origin of Subclavius

Answer 9

First costal cartilage

Question 10

Insertion of Subclavius

Answer 10

Clavicle

Question 11

Innervation of Subclavius

Answer 11

Nerve to subclavius from upper trunk of brachial plexus

Question 12

Action of Subclavius

Answer 12

Depresses the clavicle and steadies
this bone during movements of the shoulder girdle

Question 13

Origin of Serratus Anterior

Answer 13

Upper eight ribs

Question 14

Insertion of Serratus Anterior

Answer 14

Medial border and
inferior angle of the scapula

Question 15

Innervation of Serratus Anterior

Answer 15

Long thoracic nerve

Question 16

Action of Serratus Anterior

Answer 16

Draws the scapula forward around the
thoracic wall; rotates the scapula

Question 17

Origin of Trapezius

Answer 17

Occipital bone,
ligamentum nuchae,
spine of 7th cervical
vertebra, spines of all
thoracic vertebra

Question 18

Insertion of Trapezius

Answer 18

Upper fibers into
lateral third of
clavicle; middle and
lower fibers into
acromion and spine
of the scapula

Question 19

Innervation Trapezius

Answer 19

Spinal part of accessory nerve (motor) and C3 and C4 (sensory)

Question 20

Action of Trapezius

Answer 20

Upper fibers elevate the scapula;
middle fibers pull the scapula medially;
lower fibers pull medial border of the scapula downward

Question 21

Origin of Latissimus Dorsi

Answer 21

Iliac crest, lumbar fascia, spines of
lower six thoracic vertebrae, lower three or four ribs, and inferior angle of the scapula

Question 22

Insertion of Latissimus Dorsi

Answer 22

Floor of bicipital
groove of humerus

Question 23

Innervation of Latissimus Dorsi

Answer 23

Thoracodorsal nerve

Question 24

Action of Latissimus Dorsi

Answer 24

Extends, adducts
and medially rotates
the arm

Question 25

Origin of Levator Scapulae

Answer 25

Transverse processes of first four cervical vertebrae

Question 26

Insertion Levator Scapulae

Answer 26

Medial border of the scapula

Question 27

Innervation of Levator Scapulae

Answer 27

C3 and C4 and dorsal scapular nerve

Question 28

Action of Levator Scapulae

Answer 28

Raises medial border of the scapula

Question 29

Origin of Rhomboid Minor

Answer 29

Ligamentum nuchae and spines of 7th cervical vertebra and 1st thoracic vertebra

Question 30

Insertion of Rhomboid Minor

Answer 30

Medial border of the scapula

Question 31

Innervation of Rhomboid Minor

Answer 31

Dorsal scapular nerve

Question 32

Action of Rhomboid Minor

Answer 32

Raises medial border of scapula upward and medially

Question 33

Origin of Rhomboid Major

Answer 33

2nd to 5th thoracic spines

Question 34

Insertion of Rhomboid Major

Answer 34

Medial border of scapula

Question 35

Innervation of Rhomboid Major

Answer 35

Dorsal scapular nerve

Question 36

Action of Rhomboid Major

Answer 36

Raises medial border of scapula upward and medially

Question 37

Origin of Deltoid

Answer 37

Lateral third of clavicle, acromion, spine of scapula

Question 38

Insertion of Deltoid

Answer 38

Middle of lateral surface of shaft of humerus

Question 39

Innervation of Deltoid

Answer 39

Axillary nerve

Question 40

Action of Deltoid

Answer 40

Abducts arm; anterior fibers flex and medially rotate arm; posterior fibers

Question 41

Origin of Supraspinatus

Answer 41

Supraspinous fossa of scapula

Question 42

Insertion of Supraspinatus

Answer 42

Greater tuberosity of humerus; capsule of shoulder joint

Question 43

Innervation of Supraspinatus

Answer 43

Spurascapular nerve

Question 44

Action of Supraspinatus

Answer 44

Abducts arm and Stabilize shoulder

Question 45

Origin of Infraspinatus

Answer 45

Infraspinous fossa

Question 46

Insertion of Infraspinatus

Answer 46

Greater tuberosity of humerus; capsule of shoulder joint

Question 47

Innervation of Infraspinatus

Answer 47

Suprascapular nerve

Question 48

Action of Infraspinatus

Answer 48

Laterally rotates arm and stabilizes shoulder joint

Question 49

Origin of Teres Major

Answer 49

Lower third of lateral border of scapula

Question 50

Insertion of Teres Major

Answer 50

Medial lip of bicipital groove of humerus

Question 51

Innervation of Teres Major

Answer 51

Lower subscapular nerve

Question 52

Actions of Teres Major

Answer 52

Medially rotates and adducts arm and stabilizes shoulder joint

Question 53

Origin of Teres Minor

Answer 53

Upper two thirds of lateral border of the scapula

Question 54

Insertion of Teres Minor

Answer 54

Greater tuberosity of the humerus; capsule of shoulder joint

Question 55

Innervation of Teres Minor

Answer 55

Axillary nerve

Question 56

Action of Teres Minor

Answer 56

Laterally rotates arm stabilizes shoulder joint

Question 57

Origin of Subscapularis

Answer 57

Subscapular fossa

Question 58

Insertion Subscapularis

Answer 58

Lesser tuberosity of humerus

Question 59

Nerve of Subscapularis

Answer 59

Upper and lowersubscapular nerves

Question 60

Action of Subscapularis

Answer 60

Medially rotates arm and stabilizes shoulder joint