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Semester 1 > Week 8 - Muscle attachments of the shoulder > Flashcards

Week 8 - Muscle attachments of the shoulder Flashcards

1
Q

What are the proximal attachments of the deltoid?

A

Anterior: lateral 3rd of clavicle
Middle: acromion
Posterior: spine of scapula

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2
Q

What is the distal attachment of the deltoid?

A

Deltoid tuberosity of humerus

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3
Q

What is the innervation of the deltoid?

A

Axillary nerve (C5,6)

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4
Q

What is the muscle action of the deltoid?

A

Anterior: flexes and medially rotates arm
Middle: abducts arm
Posterior: extends nad laterally rotates arm

Shoulder abduction: after first 15° of movement, 1st 15° initiated by supraspinatus

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5
Q

What is the proximal attachment of the supraspinatus?

A

Supraspinous fossa of scapula

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6
Q

What is the distal attachment of the supraspinatus?

A

Superior facet of greater tubercle of humerus

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7
Q

What is the innervation of the supraspinatus?

A

Suprascapular nerve (C4, C5, C6)

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8
Q

What is the muscle action of the supraspinatus?

A

Initiates and assists deltoid in abduction of arm, acts with rotator cuff muscles.

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9
Q

What is the proximal attachment of the infraspinatus?

A

Infraspinous fossa of scapula

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10
Q

What is the distal attachment of the infraspinatus?

A

Middle facet of greater tubercle of humerus

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11
Q

What is the innervation of the infraspinatus?

A

Suprascapular nerve (C5, C6)

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12
Q

What is the muscle attachment of the infraspinatus?

A

Laterally rotates arm, acts with rotator cuff muscles

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13
Q

What is the proximal attachment of the teres minor?

A

Middle part of lateral border of scapula

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14
Q

What is the distal attachment of the teres minor?

A

Inferior facet of greater tubercle of humerus

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15
Q

What is the innervation of the teres minor?

A

Axillary nerve (C5, C6)

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16
Q

What is the muscle action of the teres minor?

A

Laterally rotates arm, acts with rotator cuff muscles

17
Q

What is the proximal attachment of the teres major?

A

Posterior suface of inferior angle of scapula

18
Q

What is the distal attachment of the teres major?

A

Medial lip of intertubercular sulcus of humerus

19
Q

What is the innervation of the teres major?

A

Lower subscapular nerve (C5, C6)

20
Q

What is the muscle action of the teres major?

A

Adducts and medially rotates arm

21
Q

What is the proximal attachment of the subscapularis?

A

Subscapular fossa

22
Q

What is the distal attachment of the subscapularis?

A

Lesser tubercle of humerus

23
Q

What is the innervation of the subscapularis?

A

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

24
Q

What is the muscle action of the subscapularis?

A

Medial rotates arm

Holds humeral head in glenoid cavity

Semester 1 (16 decks)

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