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Intrinsic muscles of the glenohumeral joint Flashcards

(24 cards)

1
Q

Where does deltoid originate?

A

Anterior: upper surface of lateral 1/3 clavicle.

Lateral: acromion process

Posterior: posterior border of spine of scapula

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2
Q

Where does deltoid insert?

A

Deltoid tuberosity

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3
Q

What innervates deltoid?

A

Axillary Nerve (C5, C6)

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4
Q

What are the actions of deltoid?

A

Anterior: flexion

Posterior: retraction

All fibres: abduction

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5
Q

Where does supraspinatus originate?

A

Medial 2/3 of supraspinous fossa

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6
Q

Where does supraspinatus insert?

A

Most superior facet on the greater tubercule

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7
Q

What innervates supraspinatus?

A

Suprascapular Nerve C5, C6

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8
Q

What is the action of supraspinatus?

A

Abduction to 15 degrees

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9
Q

Where does infraspinatus originate?

A

Medial 2/3 of infraspinous fossa

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10
Q

Where does infraspinatus insert?

A

Middle facet on posterior surface of greater tubercule

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11
Q

What innervates infraspinatus?

A

Suprascapular Nerve C5, C6

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12
Q

What is the action of Infraspinatus

A

Lateral rotation

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13
Q

Where does teres minor originate?

A

Upper 2/3 of lateral border of the scapula

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14
Q

Where does teres minor insert?

A

Inferior facet of posterior surface of the greater tubercule

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15
Q

What innervates teres minor?

A

Axillary Nerve (C6, C6)

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16
Q

What is the action of teres minor?

A

Lateral Rotation

17
Q

What is the origin of teres major?

A

Lower part of lateral border of and inferior angle of the scapular

18
Q

Where does teres major insert?

A

Medial lip of the intertubercular groove

19
Q

What is the innervation of teres major?

A

Lower subscapular nerve (C5, C6)

20
Q

What is the action of teres major?

A

Medial rotation and extension, (but not hyper extension and adduction)

21
Q

What is the origin of subscapularis?

A

Subscapular fossa

22
Q

Where does subscapularis insert?

A

Lesser tubercle

23
Q

What is the innervation of subscapularis?

A

Upper and Lower subscapular nerves (C5, C6)

24
Q

What is the action of subscapularis?

A

Medial rotation