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Shoulder OCS > Muscles > Flashcards

Muscles Flashcards

1
Q

Which muscles are innervated by the suprascapular nerve

A

Infraspinatus & supraspinatus

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2
Q

What is the supraspinatus’ main muscle action

A

Abduction of GH joint

Also: ER

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3
Q

What is the main muscle action of the infraspinatus?

A

ER of GH joint

Also: also horiz abduction

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4
Q

What innervates the teres minor

A

Axillary nerve

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5
Q

What innervates the subscapularis

A

Upper & lower subscapular nerves

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6
Q

What is the teres minor muscle action

A

ER GHJ
Horiz abd GHJ
Adduct GHJ

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7
Q

What does the sternocleidomastoid do

A

Cervical extension, ipsilateral sidebend, contralateral rotation

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8
Q

Which nerve innervates the SCM

A

Accessory nerve (CN XI)

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9
Q

What does the subclavius do?

A

Stabilize the clavicle

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10
Q

Which nerve innervates the subclavius

A

Subclavian nerve

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11
Q

What is the muscle action of the pectoralis minor

A

Anterior tip of scapula
Abduct/protract scapula
Downward rotate scapula
Depress scapula

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12
Q

Which muscles contribute to downward rotation of the scapula

A 
Rhomboid major & minor
Levator Scapulae
Serratus Anterior (superior)
Pectoralis minor
Pectoralis major (sternal)
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13
Q

Which nerves innervate the pectoralis minor

A

Medial & lateral pectoral nerves

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14
Q

How do the superior & inferior fibers of the serratus anterior differ?

A

Superior fibers: elevate & downward rotate scapula

Inferior fibers: depress & upward rotate scapula

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15
Q

Which nerve innervates the serratus anterior

A

Long thoracic nerve

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16
Q

Whis is muscle action of all fibers of serratus anterior

A

Abduct/protract scapula

Stabilize medial border of scapula

17
Q

Which portions of the trapezius elevate the scapula?

A

Trap I & II (descending)

18
Q

Which portions of the trapezius depress the scapula?

A

Trapezius IV (ascending)

19
Q

What are the muscle actions of the trapezius III (transverse)?

A

Adduct/retract scapula

20
Q

Which nerve innervates the trapezius?

A

Accessory nerve (CN XI)

21
Q

What are the muscle actions of the trapezius IV (ascending)?

A

Upward rotation
Depression
Adduct/retraction

22
Q

What are the muscle actions of the descending trapezius (I & II)?

A 
Upward rotation
Elevation
Adduction/retraction
Ipsilateral side bend
Contralateral rotation
23
Q

What are the muscle actions of the levator scapulae?

A

Elevate scapula

Downward rotate scapula

24
Q

Which muscles are innervated by the dorsal scapular nerve?

A

Rhomboid major & minor

Levator scapulae

25
Q

Which nerve innervates the deltoids?

A

Axillary

26
Q

Which nerve innervates the latissimus dorsi

A

Thoracodorsal

27
Q

Which nerve innervates the teres major

A

Lower subscapular nerve

28
Q

Which nerve innervates the pectoralis major?

A

Medial & lateral pectoral nerves

29
Q

Which nerve innervates the coracobrachialis

A

Musculocutaneous

30
Q

What is the middle deltoid muscle action?

A

GH Abduction

31
Q

What are the muscle actions of the anterior deltoid?

A 
Add GH at <60 abd
Abd GH >60 abd
Flex GH
IR GH
Horiz adduct GH
32
Q

What are the muscle actions of the posterior deltoid?

A 
Abd GH at >60 abd
Add GH at <60 abd
Ext GH
ER GH
Horiz abd GH
33
Q

What are the muscle actions of the latissimus dorsi?

A 
Add GH
Ext GH
IR GH
Horzi abduct GH
Retract scapula
Downward rotate scapula
Depress scapula
34
Q

Teres major musle action

A

Add GH
Ext GH
Ir GH
Horiz abd GH

35
Q

Which muscles adduct the GH?

A 
Pectoralis major
Latissimus dorsi
Teres major & minor
Ant & Post deltoid if <60 degrees flexion
Coracobrachialis
36
Q

Which muscles are innervated by the radial nerve?

A

Triceps
Anconeus
Brachioradialis

Shoulder OCS (5 decks)

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