Shoulder Muscles Flashcards

1
Q

What are the 9 muscles of the shoulder joint?

A

Pectoralis Major
Latissimus Dorsi
Deltoid

Coracobrachialis

Teres Minor
Infraspinatus
Teres Major
Supraspinatus
Subscapularis
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2
Q

Pectoralis Major - Origin - two heads

A

Clavicular Head
O= Medial half of clavicle

Sternal Head
O= Sternum and costal cartilidge (1-6)

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3
Q

Pectoralis Major - Insertsion

A

I= Greater tubercle crest of Humerus

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4
Q

Pectoralis Major - Actions - Clavicular head

A

Shoulder Horizontal adduction
Medial rotation of the shoulder

Assists with shoulder flexion

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5
Q

Pectoralis Major - Actions - Sternal head

A

Shoulder Horizontal adduction
Shoulder adduction
Medial rotation of the shoulder

Assists with Shoulder extension

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6
Q

Latissimus Dorsi - Origin (5 - R Sits)

A

R - Ribs - Lower 3 or 4

S - Sacrum
I - Iliac Crest
T - Thoracolumbar Fascia
S - Spine - Thoracic 7-12 & Lumbar 1-5

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7
Q

Latissimus Dorsi - Insertion

A

I= Humerus - Floor of intertubercular groove

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8
Q

Latissimus Dorsi - Actions

A

Shoulder Extension
Shoulder Adduction
Shoulder Internal (Medial) rotation

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9
Q

Deltoid - Anterior - Origin

A

O= Lateral 1/3 of clavicle

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10
Q

Deltoid - Anterior - Insertion

A

I= Deltoid tuberosity of Humerus

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11
Q

Deltoid - Anterior - Actions 4

A

Shoulder Flexion

Assists with:
Horizontal Shoulder Adduction
Shoulder Abduction
Shoulder internal (medial) rotation

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12
Q

Deltoid - Middle - Origin

A

O= Scapula - Acromion - lateral margin, superior surface

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13
Q

Deltoid - Middle - Insertion

A

I= Deltoid Tuberosity of Humerus

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14
Q

Deltoid - Middle - Actions 2

A

Shoulder Abduction

Assists with shoulder flexion

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15
Q

Deltoid - Posterior - Origin

A

O= Spine of the scapula - Inferior lip of posterior border

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16
Q

Deltoid - Posterior - Insertion

A

I= Humerus - Deltoid tuberosity

17
Q

Deltoid - Posterior - Actions

A

Horizontal Shoulder Abduction
Shoulder external rotation

Assists with:
Shoulder extension

18
Q

Coracobrachialis - Origin

A

O= Scapula, coracoid process

19
Q

Coracobrachialis - Insertsion

A

I= Humerus, proximal 1/3, medial border

20
Q

Coracobrachialis - Actions

A

Shoulder Flexion

Assists with:
Shoulder Adduction
Horizontal Shoulder Adduction

21
Q

Supraspinatus - Origin

A

O= Scapula - Supraspinatus Fossa

22
Q

Supraspinatus - Insertsion

A

I = Humerus - Greater Tuberosity

23
Q

Supraspinatus - Actions

A

Shoulder Abduction

24
Q

Infraspinatus - Origin

A

O= Scapula - Infraspinatus Fossa

25
Q

Infraspinatus - Insertion

A

I= Humerus - Greater Tuberosity

26
Q

Infraspinatus - Actions

A

Shoulder external rotation

Assists with:
Shoulder Horizontal Abduction
Shoulder Abduction

27
Q

Subscapularis - Origin

A

O= Scapula - Subscapular Fossa

28
Q

Subscapularis - Insertion

A

I= Humerus - Lesser Tuberosity

29
Q

Subscapularis - Actions

A

Shoulder Internal (Medial) Rotation

Assists Shoulder Abduction

30
Q

Teres Minor - Origin

A

O= Scapula - Lateral Border

31
Q

Teres Minor - Insertion

A

I= Humerus - Greater Tuberosity

32
Q

Teres Minor - Actions

A

Shoulder External Rotation

Assists:
Horizontal Shoulder Abduction

33
Q

Name the 4 Rotator Cuff muscles

A

Supraspinatus
Infraspinatus
Subscapularis
Teres Minor

34
Q

Teres Major - Origin

A

O= Scapula - Inferior Angle

35
Q

Teres Major - Insertion

A

I= Humerus - Lesser Tuberosity

36
Q

Teres Major - Actions

A
Shoulder Medial (Internal) Rotation
Shoulder Adduction

Assists:
Shoulder Extension