Muscles of the Glenohumeral Joint Flashcards

1
Q

What is the origin of the supraspinatus?

A

Supraspinatus fossa.

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2
Q

What is the origin of the infraspinatus?

A

Infraspinatus fossa.

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3
Q

What is the origin of the teres minor?

A

Lateral scapular border.

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4
Q

What is the origin of the subscapularis?

A

Subscapular fossa.

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5
Q

What is the insertion of the supraspinatus?

A

Greater tubercle of the humerus.

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6
Q

What is the insertion of the infraspinatus?

A

Greater tubercle of the humerus.

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7
Q

What is the insertion of the teres minor?

A

Greater tubercle of the humerus.

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8
Q

What is the insertion of the subscapularis?

A

Lesser tubercle of the humerus.

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9
Q

What are the actions of the supraspinatus?

A

Abduction of the humerus.

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10
Q

What are the actions of the infraspinatus?

A

External rotation of humerus.

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11
Q

What are the actions of the teres minor?

A

External rotation of the humerus.

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12
Q

What are the action of the subscapularis?

A

Medial rotation of the humerus.

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13
Q

What innervates the supraspinatus?

A

Suprascapular nerve

(C5-C6).

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14
Q

What innervates the infraspinatus?

A

Suprascapular nerve (C5-C6).

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15
Q

What innervates the teres minor?

A

Axillary nerve (C5-C6).

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16
Q

What innervates the subscapularis?

A

Upper and lower subscapular nerves (C5-C6).

17
Q

What is the origin of the latissimus dorsi?

A

Spinous processes T7 to sacrum via thoracolumbar fascia.

18
Q

What is the insertion of the latissimus dorsi?

A

Intertubercular groove of humerus.

19
Q

What are the actions of the latissimus dorsi?

A

Adduction, extension, and medial rotation of the humerus at the glenohumeral joint.

20
Q

What innervates the latissimus dorsi?

A

Thoracodorsal nerve (C6-C8)

21
Q

What is the origin of the Pectoralis Major?

A

Sternum, Clavicle, Costal Margins.

22
Q

What is the insertion of the Pectoralis Major?

A

Intertubular groove of the humerus

23
Q

What are the actions of the Pectoralis Major?

A

Flexion, adduction, and medial rotation of humerus.

24
Q

What innervates the Pectoralis Major?

A

Medial pectoral nerve (C8-T1) and lateral pectoral nerve (C5-C7).

25
Q

What is the origin of teres major?

A

Inferior angle of the scapula.

26
Q

What is the insertion of teres major?

A

Intertubercular groove of the humerus.

27
Q

What are the actions of teres major?

A

Adduction, extension, and medial rotation of the humerus.

28
Q

What innervates the teres major?

A

Lower subscapular nerve (C5-C6).