Scapulohumeral (intrinsic shoulder)

Question 1

What is the proximal attachment of the deltoid?

Answer 1

Lateral third of clavicle; acromion and spine of scapula

Question 2

What is the distal attachment of the deltoid?

Answer 2

Deltoid tuberosity of humerus

Question 3

What is the innervation of the deltoid?

Answer 3

Axillary nerve (C5, C6)

Question 4

What is the muscle action of the deltoid?

Answer 4

Clavicular part: flexes and medialy rotates arm
Acromial part: abducts arm
Spinal part: extends and laterraly rotates arm

Question 5

What is the proximal attachment of the supraspinatus?

Answer 5

Supraspinous fossa of scapula

Question 6

What is the distal attachment of the supraspinatus?

Answer 6

Superior facet of greater tubercle of humerus

Question 7

What is the innervation of the supraspinatus?

Answer 7

Suprascapular nerve (C4, C5, C6)

Question 8

What is the muscle action of the supraspinatus?

Answer 8

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

Question 9

What is the proximal attachment of the infraspinatus?

Answer 9

Infraspinous fossa of scapula

Question 10

What is the distal attachment of the infraspinatus?

Answer 10

Middle facet of greater tubercle of humerus

Question 11

What is the innervation of the infraspinatus?

Answer 11

Suprascapular nerve (C5, C6)

Question 12

What is the muscle action of the infraspinatus?

Answer 12

Laterally rotates arm; and acts with rotator cuff muscles

Question 13

What is the proximal attachment of the teres minor?

Answer 13

Middle part of lateral border of scapula

Question 14

What is the distal attachment of the teres minor?

Answer 14

Inferior facet of greater tubercle of humerus

Question 15

What is the innervation of the teres minor?

Answer 15

Axillary nerve (C5, C6)

Question 16

What is the muscle action of the teres minor?

Answer 16

Laterally rotates arm; and acts with the rotator cuff muscles

Question 17

What is the proximal attachment of the teres major?

Answer 17

Posterior surface of inferior angle of scapula

Question 18

What is the distal attachment of the teres major?

Answer 18

Medial lip of intertubercular sulcus of humerus

Question 19

What is the innervation of the teres major?

Answer 19

Lower scapular nerve (C5, C6)

Question 20

What is the muscle action of the teres major?

Answer 20

Adducts and medially rotates arm

Question 21

What is the proximal attachment of the subscapularis?

Answer 21

Subscapular fossa (most of anterior superior surface of scapula)

Question 22

What is the distal attachment of the subscapularis?

Answer 22

Lesser tubercle of humerus

Question 23

What is the innervation of the subscapularis?

Answer 23

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

Question 24

What is the muscle action of the subscapularis?

Answer 24

Medially rotates arm; as part of rotator cuff, helps hold head of humerus in glenoid cavity