Pectoral/Shoulder Muscles Flashcards Preview

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Flashcards in Pectoral/Shoulder Muscles Deck (46):
1

What are the 3 divisions of the pectoral/shoulder muscles?

Axiohumeral
Axioscapular
Scapulohumeral

2

What does the axiohumeral division connect?

Axial skeleton directly to the humerus

3

What else is the axiohumeral division referred to as?

"True shoulder joint"

4

What does the axioscapular division connect?

Axial skeleton to scapula

5

How many scapulohumeral muscles are there?

6 of them

6

What muscles are a part of the axiohumeral division?

Pectoralis major
Latissimus dorsi

7

What muscles are a part of the axioscapular division?

Trapezius
Levator scapula
Rhomboids
Pectoralis minor
Serratus anterior

8

What muscles are a part of the scapulohumeral division?

Deltoideus
Teres major
Teres minor
Supraspinatus
Infraspinatus
Subscapularis

9

Contraction of the clavicular head of pectoralis major does what?

Flexion of humerus

10

Sternal head fibers...

Run more superior to lateral, opposite of clavicular head fibers

11

Clavicular head of Pectoralis Major connects...

Clavicle to humerus

12

Contraction of the sternal head of the pectoralis major doea what?

Extension of arm

13

Both heads of the pectoralis major do what actions?

Adduction
Medial rotation

14

Where does the pectoralis major receive motor supply from?

Receives innervation from the brachial plexus from efferent nerves of the medial/lateral pectoral nerves

15

Where does the pectoralis minor lie in relation to pectoralis major?

Deep to pectoralis major

16

What other actions/functions is the pectoralis minor capable of?

Can stabilize the scapula
Can be a respiratory muscle because of attachment to ribs

17

Where does the Serratus Anterior reside?

Between the scapula (medial border, deep side of bone) and ribs (attaches to anteriorly to upper 8 ribs)

18

Where does the long thoracic nerve run?

Runs superiorly and inferiorly to Serratus anterior on lateral border

19

What other actions/functions can the Serratus anterior do?

Could be a respiratory muscle
Holds scapula to chest/ribs

20

Where do all 3 heads of the Deltoid converge?

On the deltoid tuberosity of the humerus

21

What head of the deltoid performs extension?

The spinous head off of the spine on the back side

22

What head of the deltoid performs flexion?

The clavicular head flexes the shoulder

23

What head of the deltoid performs abduction?

The acromial head abducts the arm/shoulder

24

What are the heads of the deltoid named after?

Their attachment points

25

What action do all 3 heads of the deltoid perform?

Abduction of the arm

26

What border does the Teres major run off of?

The axillary border

27

Where does the Teres major attach to?

The intertubercular groove of the humerus

28

What actions, like the latissimus dorsi, does Teres major also perform?

Extension of arm
Adduction of arm
Medial rotation of arm

29

What border does the Teres minor come off of?

The vertebral border of scapula

30

What does the angle of the Teres minor allow it to do?

Adduct slightly

31

What functions does the Teres minor perform?

Adduction/lateral rotation of arm

32

Where does the Teres minor attach?

To the back of humerus (looking posteriorly)
Greater tubercle of humerus

33

Where does the Supraspinatus run from?

Supraspinous fossa to greater tubercle of humerus

34

What is the Supraspinatus' function?

Abductor of arm

35

Where does the Infraspinatus lie?

Inferior to spinous fossa

36

Where does the Infraspinatus attach?

Posteriorly on the proximal humerus
Greater tubercle of humerus

37

What functions does the Infraspinatus perform?

Adduction (slightly, not strong add.)
Laterally rotates humerus

38

What is the only muscle on the anterior aspect of the scapula?

Subscapularis

39

Where does the Subscapularis lie?

In-between scapula and ribs, scapula and Serratus anterior

40

Where does the Subscapularis run to?

The lesser tubercle of humerus

41

What actions does the Subscapularis perform?

Slight adduction
Strong medial rotation

42

What happens with a "torn rotator cuff?"

The muscles pull away from the greater tubercle
Recovery at ~10% a month

43

What are the muscles of the back and shoulder?

Trapezius
Latissimus dorsi
Levator scapula
Rhomboids

44

What are the muscles of the pectoral region?

Pectoralis major
Pectoralis minor

45

What are the muscles of the shoulder?

Serratus anterior
Deltoideus

46

What are the muscles of the rotator cuff?

Teres major
Teres minor
Supraspinatus
Infraspinatus
Subscapularis