Upper Limb I: The Shoulder

Question 1

Axioappendicular

Answer 1

• Connect the axial skeleton to the upper limb
• Anterior structures part of pectoral region
• Posterior structures part of back region (specifically hypaxial since they act on the limbs)

Question 2

Scapulohumeral

Answer 2

-Connect the scapula to the humerus

Question 3

Rotator Cuff Muscles

Answer 3

• Subscapularis
• Supraspinatus
• Infraspinatus
• Teres minor

Question 4

Deltoid

Answer 4

• Action: Flexes, medially rotates, abducts, extends, and laterally rotates humerus
• Innervation: Axillary nerve

Question 5

Teres major

Answer 5

• Action: Adducts and medially rotates humerus

- Innervation: Lower subscapular nerve

Question 6

Supraspinatus

Answer 6

• Action: Works with deltoid in abduction of humerus, acts with other rotator cuff muscles in stabilizing shoulder joint
• Innervation: Suprascapular nerve

Question 7

Subscapularis

Answer 7

• Action: Medially rotates and adducts humerus helps hold humeral head in place
• Innervation: Upper and lower subscapular nerves

Question 8

Infraspinatus

Answer 8

• Action: Laterally rotates humerus, helps hold humeral head in place
• Innervation: Suprascapular nerve

Question 9

Teres minor

Answer 9

• Action: Laterally rotates humerus, helps hold humeral head in place
• Innervation: Axillary nerve