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Muscles O,I&A's > Shoulder Muscles > Flashcards

Shoulder Muscles Flashcards

1
Q

Origin of the Deltoid

A

Lateral 1/3 of clavicle
Acromion
Lower lip of the crest of the scapular spine

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2
Q

Insertion of Deltoid

A

Deltoid tuberosity of humerus

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3
Q

Action of Deltoid

A

Abducts arm
Anterior fibers: Flex & medially rotate arm
Posterior fibers: Extend and laterally rotate arm

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4
Q

Origin of Infraspinatus

A

Infraspinatus fossa

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5
Q

Insertion of Infraspinatus

A

Greater tubercle of humerus (middle facet)

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6
Q

Action of Infraspinatus

A

Laterally rotates arm

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7
Q

Origin of Latissimus Dorsi

A

SP’s T7-L5
Posterior 1/3 of iliac crest
Lower 3-4 ribs
(sometimes from inferior angle of scap)

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8
Q

Insertion of Latissimus Dorsi

A

Floor of Intertubercular Groove

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9
Q

Action of Latissimus Dorsi

A

Extends and rotates arm medially

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10
Q

Origin of Levator Scapulae

A

TVP’s C1-4

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11
Q

Insertion of Levator Scapulae

A

Medial border of scapula from the superior angle of the spine

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12
Q

Action of Levator Scapulae

A

Elevates Scapula

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13
Q

Origin of Pectoralis Major

A

Medial 1/2 of the clavicle
Manubrium & body of sternum
Costal cartilage of ribs 2-6
(Sometimes from the rectus sheath of the upper abdominal wall

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14
Q

Insertion of Pectoralis Major

A

Crest of greater tubercle of humerus

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15
Q

Action of Pectoralis Major

A

Flexes, medially rotates and adducts the arm

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16
Q

Origin of Pectoralis Minor

A

Ribs 3-5

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17
Q

Insertion of Pectoralis Minor

A

Coracoid process of scapula

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18
Q

Action of Pectoralis Minor

A

Draws the scapula forward, medial and downward

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19
Q

Origin of Rhomboids Major

A

SP’s of T2-5

20
Q

Origin of Rhomboids Minor

A

SP’s of C7-T1
Inferior end of nuchal ligament

21
Q

Insertion of Rhomboids Major

A

Medial border of scapula inferior to scapular spine

22
Q

Insertion of Rhomboids Minor

A

Medial border of scapula at the root of scapular spine

23
Q

Action of Rhomboids Major

A

Retracts, elevates and rotates scapula inferiorly

24
Q

Actions of Rhomboids minor

A

Retracts, elevates and rotates scapula inferiorly

25
Q

Origin of Serratus Anterior

A

Ribs 1-8/9

26
Q

Insertion of Serratus Anterior

A

Medial border of scapula on its costal surface

27
Q

Action of Serratus Anterior

A

Draws scapula forward, inferior fibers rotate scapula superiorly

28
Q

Insertion of Subclavius

A

Inferior surface of clavicle

29
Q

Origin of Subclavius

A

1st rib and its cartilage

30
Q

Action of Subclavius

A

Draws clavicle (hence shoulder) down and forward

31
Q

Origin of subscapularis

A

Subscapular fossa

32
Q

Insertion of subscapularis

A

Lesser Tubercle of humerus

33
Q

Action of Subscapularis

A

Medially rotates arm ; assists extension of arm

34
Q

Origin of Supraspinatus

A

Supraspinatus fossa

35
Q

Insertion of Supraspinatus

A

Greater tubercle of humerus (highest facet)

36
Q

Action of Supraspinatus

A

Abducts the arm (initiates abduction)

37
Q

Origin of Teres Major

A

Dorsal surface of the inferior angle of the scapula

38
Q

Insertion of Teres Major

A

Crest of the lesser tubercle of humerus

39
Q

Action of Teres Major

A

Adducts and medially rotates arm ; assists in extension (lats little help)

40
Q

Origin of Teres Minor

A

Upper 2/3 of lateral border of scapula

41
Q

Insertion of Teres Minor

A

Greater tubercle of humerus (lower facet)

42
Q

Action of Teres Minor

A

Laterally rotates arm

43
Q

Origin of Trapezius

A

Medial 1/3 of superior nuchal line
External occipital protuberance
Nuchal ligament
SP’s C7-T12

44
Q

Insertion of Trapezius

A

Lateral 1/3 of clavicle
Medial side of acromion
Upper crest of scapular spine
Tubercle of scapular spine

45
Q

Action of Trapezius

A

Elevates and depresses scapula (depending on what part of muscle is contracting)
Rotates scapula superiorly
Retracts scapula

Muscles O,I&A's (13 decks)

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