G: Scapular & Pectoral Flashcards Preview

F16: Anatomy Test 3 > G: Scapular & Pectoral > Flashcards

Flashcards in G: Scapular & Pectoral Deck (59):
1

What is the action of the deltoid muscle?

Primary: abduct humerus

Secondary: Flex, extend, & rotate humerus

2

Deltoid nurovasculature?

Axillary nerve (C5, C6)

posterior circumflex humeral vessels

3

Teres major muscle actions?

Medially rotate and extend humerus

4

Teres major nurovasculature?

Lower (inferior) subscapular nerve (C5-C7)

subscapular vessels

5

Supraspinatus muscle action?

Abducts humerus for the first 15 degrees

6

Supraspinatus muscle nurovasculature?

Suprascapular nerve (C5, C6)

suprascapular vessels and dorsal scapular vessels.

7

Infraspinatus muscle action?

Laterally rotates the humerus

8

Infraspinatus muscle nurovasculature?

Suprascapular nerve (C5, C6)

suprascapular vessels and subscapular vessels

9

Teres minor muscle actions?

Lateral rotation of the humerus

10

Teres minor muscle nurovasculature

Axillary nerve (C5, C6)

suprascapular vessels and subscapular vessels.

11

Subscapularis muscle actions?

Medial rotation of the humerus.

12

Subscapularis muscle nurovasculature?

Upper and lower subscapular nerves

subscapular vessels

13

What provides the outer muscular support of the shoulder region?

Deltoid muscle

14

What muscles provide the inner rotator cuff support of the shoulder region.

SITS

Supraspinatus: superior

Infraspinatus: lateral

Teres minor: lateral/slightly inferior

Subscapularis: medial/slightly inferior

15

What is found in the subacromial bursa?

Lubricating synovial fluid

16

Does the subacromial bursa communicate with the joint capsule?

No. It is superior to the supraspinatus muscle

17

What happens to the subacromial bursa with age?

May join with joint capsule as supraspinatus tendon degenerates.

18

What are the borders of the quadrangular space?

Superior = teres minor
Inferior = teres major
Medial = long head of triceps brachii
Lateral = surgical neck of humerus

19

What passes through the quadrangular space?

Axillary nerve and posterior circumflex humeral vessels

20

What are the borders of the triangular space?

Superior: Teres minor
Inferior: teres major
Lateral: long head of triceps brachii

21

What passes through the triangular space?

Circumflex scapular vessels

22

What are the borders of the triangular interval?

Superior = teres major
Medial = long head of triceps brachii
Lateral = lateral head of triceps brachii

23

What passes through the triangular interval?

Radial nerve and deep brachial artery (aka profunda brachial artery)

24

How do the suprascapular nerve and artery differ in their paths?

Nerve: runs UNDER superior transverse scapular ligament and THRU suprascapular notch

Artery: runs OVER sup trans scap lig and ABOVE suprascapular notch

25

What muscles do the suprascapular nerve and artery supply?

Supraspinatus and infraspinatus

26

What cervical nerves supply the suprascapular nerve?

Ventral rami of C5-C6

27

What cervical rami supple the dorsal scapular nerve?

Ventral ramus of C5

28

What muscles do the dorsal scapular nerve and deep transverse cervical artery supply?

Levator scapulae & rhomboid muscles

29

What nerve runs with the deep transverse cervical artery?

Dorsal scapular nerve

30

What nerve runs along the transverse cervical artery?

Accessory nerve (CN XI) after descending through the neck.

31

T/F: Superficial transverse cervical artery runs deep to the trapezius muscle?

True

32

What muscle do the accessory nerve and transverse cervical artery supply?

Trapezius muscle

33

What muscle do the upper and lower subscapular nerves and subscapular artery supply?

All: subscapularis muscle

Lower subscapularis nerve & subscapularis artery: teres major

34

What is the reasoning for collateral circulation?

Ensures adequate blood supply to UL in event of insufficient flow through axillary artery

35

Where is the ligature for the collateral circulation of the scapular region?

On the axial artery between the thyrocervical truck and subscapular artery

36

Is the sternum part of the pectoral girdle?

NO

37

What are the three functions of the clavicle bone?

1. Holding UL free from trunk for max range of motion

2. Provide attachments for muscles

3. Transmit forces from UL -> axial skeleton

38

What bone connects the clavicle to the humerus?

Scapula

39

What ribs do the scapula span vertically?

2nd - 7th

40

What are the three joints of the shoulder complex?

1. Sternoclavicular
2. Acromioclavicular
3. Glenohumeral

41

What is the action of the pectoralis major muscle?

Adducts and medially rotates humerus

42

What is the nurovasculature for the pectoralis major muscle?

medial and lateral pectoral nerve

Thoracoacrominal vessels

43

What is the action of pectoralis minor muscle?

Protracts scapular

44

What is the neurovascular supply of the pectoralis minor muscle?

Medial pectoral nerve

Thoracoacromial vessels

45

What major artery does the lateral thoracic artery branch from?

Axillary artery (deep to pec minor)

46

What does the lateral thoracic artery supply?

Lateral thorax, lateral pec region, lateral breast

47

What major artery does the internal thoracic artery branch from?

Subclavian artery

48

What does the internal thoracic artery supply?

Anterior thorax, medial pec region, medial breast

49

What major artery does the thoracoacromial artery branch from?

Axillary artery (under pec minor)

50

What are the four branches of the thoracoacromial artery?

Pectoral artery - upper pec region
Clavicular artery - clavicle region
Acromial artery - upper shoulder region
Deltoid artery - lower shoulder region

51

What vertebral levels give rise to the cutaneous nerves of the pectoral regions?

T1-T6

52

What ventral vertebral rami give rise to the medial pectoral nerve?

C8-T1

53

What muscle(s) does the medial pectoral nerve innervate?

Pectoralis minor and part of pec major

54

What ventral vertebral rami give rise to the lateral pectoral nerve?

C5-C7

55

What muscle does the lateral pectoral nerve innervate?

Pectoralis major

56

Which pectoral nerve pierces the pectoralis minor muscle?

Medial pectoral nerve

57

What ventral vertebral rami give rise to the long thoracic nerve?

C5-C7

58

What muscle does the long thoracic nerve supply?

Serratus anterior superficially

59

What nerve can be damaged during a mastectomy resulting in a "winged scapula"?

Long thoracic nerve