L14: Muscles of the Pectoral Girdle and Arm Flashcards Preview

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Flashcards in L14: Muscles of the Pectoral Girdle and Arm Deck (65):
1

what are upper appendicular muscles? (hint:5)

- move pectoral girdle
- move glenohumeral joint/arm
- muscles of arm
- muscles of forearm
- intrinsic muscles of hand

2

What are the movements of the pectoral girdle?

- elevation, depression
- protraction, retraction
- scapula upward and downward rotation

3

Where do muscles that move the pectoral girdle originate and insert?

- originate on axial skeleton
- insert on pectoral girdle

4

What are the anterior muscles that move the pectoral girdle? (hint: 3)

- trapezius
- pectoralis minor
- serratus anterior

5

What are the posterior muscles that move the pectoral girdle? (hint: 5)

- trapezius
- levator scapulae
- rhomboid minor
- rhomboid major
- serratus anterior

6

What is the external structure of the pectoralis minor?

- fan or convergent

7

origin and insertion of pectoralis minor?

origin: anterosup. surfaces of ribs 3-5

insertion: coracoid process of scapula

8

function of pectoralis minor? (hint: 3)

- depress and protract shoulder
- downward rotation of scapula
- elevate ribs

9

external structure of serratus anterior?

serrated

10

origin and insertion of serratus anterior?

origin: anterosuperior margins of ribs 1-8 or 9

insertion: anterior surface of vertebral (medial) border of the scapula

11

function of serratus anterior?

- protract shoulder
- upward rotation of scapula (glenoid cavity points superiorly)

12

external structure of trapezius?

trapezoid

13

origin and insertion of trapezius?

origin: occipital bone, ligamentum nuchae, spinous processes of thoracic vertebrae

insertion: clavicle, acromion, spine of scapula

14

function of trapezius?

-elevate, retract, depress, rotate scapula (upward)

15

external structure of rhomboid minor/major?

diamond

16

origin and insertion of rhomboid MINOR?

origin: spinous processes C7-T1

insertion: medial border of scapular (superior to spine)

17

function of rhomboid minor?

- elevate, retract, downward rotate scapula

18

origin and insertion of rhomboid MAJOR?

originate: spinous processes T2-T5

insertion: medial border of scapula (inferior to spine)

19

function of rhomboid major?

- elevate, retract, downward rotate scapula

20

Origination/insertion of muscles that move the glenohumeral joint?

origin: axial skeleton OR pectoral girdle

insertion: cross the glenohumeral joint

21

do all glenohumeral joint muscles insert onto the humerus?

no

22

what are the two types of pectoralis major?

- clavicular head
- sternal head

23

what are the two types of biceps brachii?

-long head
- short head

24

external structure of pectoralis major?

- fan or convergent

25

origin and insertion of pectoralis major?

origin: body of sternum, costocartilages 2-6,, inferomedial portion of clavicle

insertion: greater tubercle and lateral lip of intertubercular groove of humerus

26

function of pectoralis major?

- flexion, adduction, medial (internal) rotation of arm

27

external structure of deltoid?

- triangular

28

origin and insertion of deltoid?

origin: lateral clavicle, acromion, spine of scapula

insertion: deltoid tuberosity of humerus

29

function of deltoid?

- arm abduction, flexion and medial rotation, extension, lateral rotation

30

what are the 3 anatomical segments of the deltoid?

- middle deltoid
- posterior deltoid
- anterior deltoid

31

action of middle deltoid in glenohumeral joint?

abduction

32

action of posterior deltoid in GHJ?

extension, lateral rotation

33

action of anterior deltoid in GHJ?

- flexion, medial rotation

34

external structure of latissimus dorsi?

- convergent

35

origin and insertion of latissimus dorsi?

origin: spinous processes of inferior thoracic vertebrae, ribs 8-12, and thoracolumbar fascia, iliac crest

insertion: floor of intertubercular groove of humerus

36

function of latissimus dorsi?

- extension, adduction, medial rotation of arm

37

external structure of teres major ?

fusiform

38

origin and insertion of teres major?

origin: inferior angle of scapula

insertion: medial lip of intertubercular groove of humerus

39

function of teres major?

- extension, medial rotation of shoulder

40

Rotator cuff: Supraspinatus position, action, insertion

- superior
- abduction
- insertion: greater tubercle

41

rotator cuff: infraspinatus position, action, insertion

- posterior
- lateral rotation
- greater tubercle

42

rotator cuff: teres minor position, action, insertion?

- posterior
- lateral rotation
- greater tubercle

43

rotator cuff: subscapularis position, action, insertion?

- anterior
- medial rotation
- lesser tubercle

44

What are the muscular compartments of the arm/brachium?

- flexor (anterior)
- extensor (posterior)

45

what divides the muscular compartments of the arm/brachium?

- connective tissue (deep fascia)

46

what is intermuscular septum of the arm/brachium?

- deep fascia encircles muscle groups and inserts into the periosteum of the bone as an intermuscular septum

47

what does the coracobrachialis cross?

- anterior/medial glenohumeral joint

48

what do the biceps brachii cross?

- long head crosses superior/anterio GHJ and anterior humeroulnar joint, and proximal radioulnar joint

-short head crosses anterior GHJ and anterior HUJ and proximal RUJ

49

what does the brachialis cross?

- anterior humeroulnar joint

50

external structure of biceps brachii?

-fusiform, 2 heads

51

origin and insertion of biceps brachii?

origin: short head = coracoid process, long head = supraglenoid tubercle

insertion: radial tuberosity and bicipital aponeurosis

52

function of biceps brachii

- flexion at GHJ and elbow
- supination of flexed forearm

53

origin/ insertion of coracobrachialis

origin: coracoid process
insertion: medial margins of humeral shaft

54

function of coracobrachialis?

adduction and flexion of arm
- moves the GHJ

55

origin and insertion of brachialis?

origin: anterior distal surface of humerus

insertion: coronoid process of ulna

56

function of brachialis?

- flexion of elbow

57

origin/insertion of brachioradialis?

origin: lateral supracondylar ridge of distal humerus

insertion: base of styloid process of the radius

58

function of brachioradialis?

- flexion of elbow

59

Brachioradialis: distinguishing between extensor or flexor?

- forms part of posterolateral compartment of forearm which is the wrist's extensor compartment
- however, this muscle is a FLEXOR of the ELBOW

60

what does the triceps brachii cross?

- long head crosses posterior GHJ and posterior HUJ
- lateral head crosses posterior HUJ
- medial head crosses posterior HUJ

61

what does the anconeus cross?

- posterolateral elbow joint and also attaches to the capsule

62

external structure of triceps brachii?

fusiform three heads

63

origin of triceps brachii?

long head = infraglenoid tubercle of scapula
lateral head = superior lateral margin of humerus
medial head = posterior surface of humerus inferior to radial groove

64

insertion of triceps brachii

olecranon process of ulna

65

function of triceps brachii?

- extension of elbow
- long head only: extension and adduction at shoulder