Muscles of the Shoulder

Question 1

These muscles cross the shoulder joint to insert in the arm and therefore actually move the arm.

Answer 1

Muscles of the shoulder

Question 2

The 6 intrinsic shoulder muscles

Answer 2

Deltoid, Infraspinatus, subscapularis, supraspinatus,teres major, teres minor

Question 3

Large fan shaped muscle that covers superior part of thorax

Answer 3

Pectoralis Major

Question 4

Muscle of the shoulder that has two heads, on clavicular and one sternum forming the anterior wall of the axilla (anterior axillary wall)

Answer 4

Pectoralis Major

Question 5

This muscle is a powerful adductor of the arm and medial rotator of the humerus, and its two parts can activate separately

Answer 5

Pectoralis Major

Question 6

Originates at clavicle, sternum, and ribs 1-6 cartilage

Inserts into intertubercular sulcus of the humerus

Answer 6

Pectoralis Major

Question 7

Innervated by the lateral and medial pectoral nerves, which arise from the brachioplexus

Answer 7

Pectoralis Major

Question 8

Flexus, adducts, and rotates the humerus medially

Answer 8

Pectoralis Major

Question 9

Widest muscle on the posterior side of the thorax, covers half of back (trunk) and inserts into the humerus

Answer 9

Latissimus Dorsi

Question 10

Forms the posterior axillary fold

Answer 10

Latissimus Dorsi

Question 11

Extends, Retracts, and rotates the humerus medially

Ex: touching scapula on the opposite side

Answer 11

Latissimus Dorsi

Question 12

Powerful adductor of the humerus when working with the pectoralis major.

Ex: Important in restoring the upper limb to the shoulder from an abducted position like in climbing

Answer 12

Latissimus Dorsi

Question 13

Raises the trunk to the arm like pullups

Answer 13

Latissimus Dorsi

Question 14

Originates at thoracolumbar, or lumbardorsal fascia

Answer 14

Latissimus Dorsi

Question 15

A wide band of fascia, like an aponeurosis that originates of spinous processes of T7-T12, the lumbar vertabrae, iliac crest, and sometimes the inferior angle of the scapula

Answer 15

Lumbodorsal Fascia

Question 16

Inserts into intertubercular groove of the humerus

Answer 16

Latissimus Dorsi

Question 17

Innervated by the thoracodorsal nerve

Answer 17

Latissimus Dorsi

Question 18

Extends retracts and rotates the humerus medially and is a powerful adductor and depresses the shoulder

Answer 18

Latissimus Dorsi

Question 19

Good area to hear the lungs because its not covered by muscle, good for identifying muscles

Answer 19

Triangle of Ausculation

Question 20

Rounded part of the shoulder, shaped like triangle, divided into three parts

Answer 20

Deltoid

Question 21

Anterior fibers in deltoid aid the pectoralis major in

Answer 21

flexing the arm and medial rotation

Question 22

Posterior fibers of deltoid aid the latissimus dorsi with

Answer 22

extending the arm and lateral rotation

Question 23

Posterior and anterior fibers do what to the arm while walking?

Answer 23

Swings the arm

Question 24

Stabilizes the shoulder joint by holding the head of the humerus in the glenoid cavity during shoulder movement

Answer 24

Deltoid

Question 25

Involved in abductory movement esp avove 15 degrees

Answer 25

Deltoid

Question 26

Axillary nerve runs deep to it from behind

Answer 26

Deltoid

Question 27

Originates from the lateral one third of clavicle, acromion process, and the lateral aspect of the spine of the scapula Inserts into deltoid tuberosity on humerus

Answer 27

Deltoid

Question 28

Muscle that is trianglular and fills in the subscapular fossa and inserts into the lesser tubercle

Answer 28

Subscapularis

Question 29

This rotator cuff muscle is the primary medial rotator of the arm

Answer 29

Subscapularis

Question 30

Rotator cuff muscles do what to the humerus in the glenoid cavity?

Answer 30

Hold the head inside of it

Question 31

Helps to form part of posterior axillary fold along with latissimus dorsi

Answer 31

Subscapularis

Question 32

Origin is from the deep side of the scapula - the subscapular fossa (costal surface of the scapula) and inserts and at the lesser tubercle

Answer 32

Subscapularis

Question 33

Inervated by the subscapular nerve

Answer 33

Subscapularis

Question 34

Occupies the supraspinous fossa and inserts into the greater tubercle of the humerus

Answer 34

Supraspinatous

Question 35

To view this muscle, the trapezius and the deltoid must be reflected

Answer 35

Supraspinatus

Question 36

Muscle that initiates abduction until 15 degrees away from body.

Answer 36

Supraspinatus

Question 37

Origin is supraspinous fossa and insertion is in the greater tubercle of the humerus.

Answer 37

Supraspinatus

Question 38

Innervated by the suprascapular nerve

Answer 38

Supraspinatus

Question 39

Also helps to stabilize the shoulder during rotation And prevents downward dislocation of the humerus when carrying a suitcase

Answer 39

Supraspinatus

Question 40

Muscle that occupies the infraspinous fossa and inserts into the greater tubercle of the humerus.

Answer 40

Infraspinatus

Question 41

Also must reflect the deltoid and the trapezius for this muscle

Answer 41

Infraspinatus

Question 42

A powerful lateral rotator of the humerus Originates from infraspinus fossa of the scapula and inserts in the greater tubercle just posterior to the supraspinatus

Answer 42

Infraspinatus

Question 43

Innervated by the suprascapular nerve

Answer 43

Infraspinatus

Question 44

Narrow muscle that is not distinct from infraspinatus having the same action as the infraspinatus

Answer 44

Teres Minor

Question 45

Origin is on the lateral border of the posterior surface of the scapula and insertion is on the greater tubercle, posterior to the infraspinatus

Answer 45

Teres minor

Question 46

Innervated by the axillary nerve and has same action as infraspinatus (rotates laterally and stabilizes)

Answer 46

Teres minor

Question 47

Rotator cuff muscles can also be called

Answer 47

Scapulohumeral muscles

Question 48

Have a steadying effect on the head of the humerus and rotate in the glenohumeral joint

Answer 48

Rotator Cuff

Question 49

All muscles of rotator cuff help rotate the humerus except the...

Answer 49

supraspinatus

Question 50

All 4 rotator cuff muscles do this to hold the humeral head

Answer 50

Tonic contraction

Question 51

The most commonly injured injury occurs with the...

Answer 51

Supraspinatus

Question 52

Tearing of this muscle may follow dislocation of the humerus and degenerative tendonitis is common in older people ex of injury: Violently pushing into abduction like checking a shoulder into a board or throwing the ball hard or swimming.

Answer 52

rotator cuff muscle

Question 53

To diagnose, person is asked to lower their arm from a 90 degree angle. If injured, limb will quickly drop to the side.

Answer 53

Rotator cuff muscle

Question 54

Thick cylinder shaped muscle, forms rounded area on the inferior lateral third of scapula when arm is abducted against resistance and helps form posterior axillary fold with the latissimus dorsi

Answer 54

Teres Major

Question 55

Adducts and medially rotates the arm and is important stabilizer of humeral head by holding it in place against the pull of the deltoid

Answer 55

Teres Major

Question 56

Originates off the posterior surface of the scapula along the inferior angle and nserts into the intertubercular sulcus of the humerus and the tendon fuses with the latissimus dorsi

Answer 56

Teres Major

Question 57

Innervated by the subscapular nerve

Answer 57

Teres Major

Question 58

Adducts extends and medially rotates the arm, like the lattisimus dorsi

Answer 58

Teres major

Question 59

Name the three muscles that insert in the intertubercular sulcus. There is a major on both sides.

Answer 59

``` Pectoralis Major (laterally) Latissimus Dorsi (intermediate) Teres Major (medial) ```

Question 60

Extends from the corocoid process to the brachium

Answer 60

Coracobrachialis

Question 61

The musculocutaneous nerve runs right through it

Answer 61

Coracobrachialis

Question 62

Originates from the corocoid process and inserts on medial surface of the humerus.

Answer 62

Coracobrachialis

Question 63

Flexes and adducts the arm

Answer 63

Coracobrachialis