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Upper Limb Muscles > Scapulohumeral (Intrinsic shoulder) > Flashcards

Scapulohumeral (Intrinsic shoulder) Flashcards

0
Q

What is the insertion of the deltoids?

A

deltoid tuberosity of humerus

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1
Q

What are the origins of the deltoids?

A

Lateral third of clavicle, acromion, & spine of scapula

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2
Q

What innervates the deltoids?

A

Axillary nerve (C5, C6)

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3
Q

What are the actions of the deltoids?

A

Clavicular (anterior): part flexes & medially rotates shoulder joint
Acromial (middle): abducts shoulder joint
Spinal (posterior): extends & laterally rotates shoulder joint

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4
Q

What is the origin of supraspinatus?

A

Supraspinous fossa of scapula

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5
Q

What is the insertion of suprapinatus?

A

Superior facet of greater tubercle of humerus

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6
Q

What innervates supraspinatus?

A

Suprascapular nerve (C4, C5, C6)

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7
Q

What are the actions of supraspinatus?

A

Abducts shoulder to first 15 degrees

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8
Q

What is the origin of infraspinatus?

A

Infraspinous fossa of scapula

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9
Q

What is the insertion of infraspinatus?

A

Middle facet of greater tubercle of humerus

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10
Q

What innervates infraspinatus?

A

Suprascapular nerve (C5, C6)

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11
Q

What are the actions of infraspinatus?

A

Laterally rotate shoulder joint & help hold humeral head in glenoid cavity of scapula

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12
Q

What is the origin of teres minor?

A

Middle part of lateral border of scapula

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13
Q

What is the insertion of teres minor?

A

Inferior facet of greater tubercle of humerus

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14
Q

What innervates teres minor?

A

Axillary nerve (C5, C6)

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15
Q

What are the actions of teres minor?

A

Laterally rotate shoulder joint; help hold humeral head in glenoid cavity of scapula

16
Q

What is the origin of teres major?

A

Inferior part of lateral border of scapula & posterior surface of inferior angle of scapula

17
Q

What is the insertion of teres major?

A

Medial lip of intertubercular sulcus of humerus

18
Q

What innervates teres major?

A

Lower subscapular nerve (C5, C6)

19
Q

What are the actions of teres major?

A

Adducts & medially rotates shoulder joint

20
Q

What is the origin of subscapularis?

A

Subscapular fossa

21
Q

What is the insertion of subscapularis?

A

Lesser tubercle of humerus

22
Q

What innervates subscapularis?

A

Upper & lower subscapular nerves (C5, C6, C7)

23
Q

What are the actions of subscapularis?

A

Medially rotates and adducts shoulder joint; helps hold humeral head in glenoid cavity

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