Chapter 5 Shoulder Joint

Question 1

Pectoralis Major upper fibers O&I

Answer 1

origin: medial half of the anterior surface of clavicle
insertion: flat tendon 2 or 3 inches wide to lateral lip of intertubercular groove of humerus

Question 2

Pectoralis Major upper fibers action

Answer 2

action: internal rotation, horizontal adduction, diagonal adduction, flexion, abduction

Question 3

Pectoralis Major upper fibers innervation

Answer 3

innervation: lateral pectoral nerve (C5, C6, C7)

Question 4

Pectoralis Major lower fibers O&I

Answer 4

origin: anterior surface of costal cartilages of first six ribs, and adjoining portion of sternum
insertion: flat tendon 2 or 3 inches wide to lateral lip of intertubercular groove of humerus

Question 5

Pectoralis Major lower fibers action

Answer 5

action: internal rotation, horizontal adduction, diagonal adduction, extension from flexed position, adduction

Question 6

Pectoralis Major lower fibers innervation

Answer 6

innervation: medial pectoral nerve (C8, T1)

Question 7

Subscapularis O&I

Answer 7

origin: entire anterior surface of subscapular surface
insertion: lesser tubercle of humerus

Question 8

Subscapularis action

Answer 8

action: internal rotation, adduction, extension

Question 9

Subscapularis innervation

Answer 9

innervation: upper and lower subscapular nerve (C5, C6)

Question 10

Coracobrachialis O&I

Answer 10

origin: coracoid process of scapula
insertion: middle of medial border of humeral shaft

Question 11

Coracobrachialis action

Answer 11

action: horizontal adduction, diagonal adduction, flexion

Question 12

Coracobrachialis innervation

Answer 12

innervation: musculotaneous nerve (C5, C6, C7)

Question 13

Deltoid anterior fibers O&I

Answer 13

origin: anterior lateral third of clavicle
insertion: deltoid tuberosity on lateral humerus

Question 14

Deltoid anterior fibers action

Answer 14

action: abduction, flexion, horizontal adduction, internal rotation, diagonal adduction

Question 15

Deltoid anterior fibers innervation

Answer 15

innervation: axillary nerve (C5, C6)

Question 16

Deltoid middle fibers O&I

Answer 16

origin: lateral aspect of acromion
insertion: deltoid tuberosity on lateral humerus

Question 17

Deltoid middle fibers action

Answer 17

action: abduction, horizontal abduction

Question 18

Deltoid middle fibers innervation

Answer 18

innervation: axillary nerve (C5, C6)

Question 19

Deltoid posterior fibers O&I

Answer 19

origin: inferior edge of spine of scapula
insertion: deltoid tuberosity on lateral humerus

Question 20

Deltoid posterior fibers action

Answer 20

action: abduction, horizontal abduction, external rotation, diagonal abduction

Question 21

Deltoid posterior fibers innervation

Answer 21

innervation: axillary nerve (C5, C6)

Question 22

Supraspinatus O&I

Answer 22

origin: medial two-thirds of supraspinous fossa
insertion: superiorly on greater tubercle of humerus

Question 23

Supraspinatus action

Answer 23

abduction

Question 24

Supraspinatus innervation

Answer 24

suprascapula nerve (C5)

Question 25

Latissimus Dorsi O&I

Answer 25

origin: posterior crest of ilium, back of sacrum and spinous processes of lumbar and lower six thoracic vertebrae, sips from lower three ribs insertion: medial side of intertubercular groove of humerus

Question 26

Latissimus Dorsi action

Answer 26

extension, adduction, internal rotation, horizontal abduction

Question 27

Latissimus Dorsi innervation

Answer 27

thoracodorsal (C6, C7, C8)

Question 28

Teres Major O&I

Answer 28

origin: posteriorly on inferior third of lateral border of scapula and just superior to inferior angle insertion: medial lip of intertubercular groove of humerus,

Question 29

Teres Major action

Answer 29

extension, adduction, internal rotation

Question 30

Teres Major innervation

Answer 30

lower subscapular nerve (C5, C6)

Question 31

Infraspinatus O&I

Answer 31

origin: infraspinous fossa just below spine of scapula insertion: posteriorly on greater tubercle of humerus

Question 32

Infraspinatus action

Answer 32

external rotation, horizontal abduction, extension, diagonal abduction

Question 33

Infraspinatus innervation

Answer 33

suprascapula nerve (C5, C6)

Question 34

Teres Minor O&I

Answer 34

origin: posteriorly on upper and middle aspect of lateral border of scapula insertion: posteriorly on greater tubercle

Question 35

Teres Minor action

Answer 35

external rotation, horizontal abduction, extension, diagonal abduction

Question 36

Teres Minor innervation

Answer 36

axillary nerve (C5, C6)