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Human Anatomy 2 > Muscles Of The Shoulder (2) > Flashcards

Muscles Of The Shoulder (2) Flashcards

1
Q

What’s the origin of the deltoid?

A

Lateral 1/3 of clavicle

Acromion

Spine of scapula

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2
Q

What’s the attachment of the deltoid?

A

Deltoid tuberosity

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3
Q

What is the function of the anterior part of the deltoid?

A

Flexes and medially rotates arm

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4
Q

What is the function of the middle part of the deltoid?

A

Abducts arm

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5
Q

What is the function of the posterior part of the deltoid?

A

Extends and laterally rotates arm

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6
Q

What is the origin of the teres major?

A

Inferior angle of scapula

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7
Q

What is the attachment of the teres major?

A

Medial lip of intertubercular sulcus

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8
Q

What is the function of the teres major?

A

Adducts and medially rotates arm

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9
Q

What is the origin of the supraspinatus?

A

Supraspinatus fossa

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10
Q

What is the attachment of the supraspinatus?

A

Superior facet of greater tubercle of humerus

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11
Q

What is the function of the supraspinatus?

A

Initiates and assists deltoid in abduction of arm

Acts with other rotator cuff muscles

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12
Q

What is the origin of the infraspinatus?

A

Infraspinatus fossa

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13
Q

What is the attachment of the Infraspinatus?

A

Middle facet of greater tubercle of humerus

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14
Q

What is the function of the Infraspinatus?

A

Laterally rotates arms

Acts with other rotator cuff muscles

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15
Q

What is the origin of the teres minor?

A

Middle part of lateral border of scapula

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16
Q

What is the attachment of the teres minor?

A

Inferior facet of greater tubercle of humerus

17
Q

What is the function of the teres minor?

A

Laterally rotates arm

Acts with other rotator cuff muscles

18
Q

What is the origin of the subscapularis?

A

Subscapular fossa

19
Q

What is the attachment of the subscapularis?

A

Lesser tubercle of the humerus

20
Q

What is the function of the subscapularis?

A

Medially rotates arm

Helps hold humerus in glenoid cavity with rotator cuff muscles

21
Q

What muscles aid in elevation of scapula?

A

Trapezius (descending part)

Levator scapulae

Rhomboids

22
Q

What muscles aid in depression of scapula?

A

Pec major (inferior sternocostal head)

Latissimus Dorsi

Trapezius (ascending part)

Serratus anterior (inferior part)

Pec minor

23
Q

What muscles aid in protraction of scapula?

A

Serratus anterior

Pec major

Pec minor

24
Q

What muscles aid in retraction of scapula?

A

Trapezius (middle part)

Rhomboids

Latissimus dorsi

25
Q

What muscles aid in upward rotation of scapula?

A

Trapezius (descending part)

Trapezius (ascending part)

Serratus anterior (inferior part)

26
Q

What muscles aid in downward rotation of scapula?

A

Levator scapulae

Rhomboids

Lattisimus dorsi

Pec minor

Pec major (inferior sternocostal head)

27
Q

What two muscles of mastication work together?

A

Masseter and medial pterygoid

28
Q

What are the advantages of the rotator cuff?

A

Compresses humerus into glenoid fossa

Limits superior translation

Axis rotation

29
Q

What may damage the axillary nerve?

A

Fracture of surgical neck

30
Q

What is an important site for axillary nerve issues?

A

Quad (teres minor, teres major, humerus, long head of triceps)

Human Anatomy 2 (20 decks)

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