Scapular and Deltoid Regions

Question 1

Deltoid

Answer 1

Proximal Attachment:

-lateral 1/3 of clavicle, acromion and spine of scapula

Distal Attachment: -deltoid tuberosity of humerus

Actions: -flexes, medially rotates, abducts, extends, and laterally rotates humerus

Innervation: -axillary nerve (C5, C6)

Blood supply: deltoid branch of thoracoacromial arterial trunk

Question 2

Teres major

Answer 2

Proximal Attachment:

-posterior surface of inferior angle of scapula

Distal Attachment:

• medial lip of intertubercular (bicipital) groove of humerus Actions:
• adducts and medially rotates humerus

Innervation: -lower subscapular nerve (C5, C6)

Blood supply: circumflex scapular
artery

Question 3

Serratus anterior

Answer 3

Proximal Attachment:

-external surfaces of lateral parts of ribs 1-9

Distal Attachment:

-anterior surface of medial border of scapula

Actions:

-protracts scapula and holds it against thoracic wall; rotates scapula

Innervation: -long thoracic nerve (C5, C6, C7) (“raise your arms to heaven”)

Blood supply: lateral thoracic artery

Question 4

Supraspinatus

Answer 4

Proximal Attachment:

-supraspinous fossa of scapula

Distal Attachment:

-superior facet of greater tubercle of humerus

Actions:

-works with deltoid in abduction of humerus, acts with other rotator cuff muscles in stabilizing shoulder joint

Innervation:

-suprascapular nerve (C4, C5, C6)

Blood supply: suprascapular artery

Question 5

Subscapularis

Answer 5

Proximal Attachment:

-subscapular fossa (anterior surface of scapula

Distal Attachment:

-lesser tubercle of humerus

Actions:

-medially rotates and adducts humerus helps hold humeral head in place

Innervation: -upper & lower subscapular nerves anterior/costal (C5, C6, C7)

Blood supply: subscapular artery

Question 6

Infraspinatus

Answer 6

Proximal Attachment:

-infraspinous fossa of scapula

Distal Attachment:

-middle facet of greater tubercle of humerus

Actions:

-laterally rotates humerus, helps hold humeral head in place

Innervation: -suprascapular nerve (C5, C6)

Question 7

Teres minor

Answer 7

Proximal Attachment:

-middle part of lateral border of scapula

Distal Attachment:

-inferior facet of greater tubercle of humerus

Actions:

• laterally rotates humerus, helps hold humeral head in place

Innervation: -axillary nerve (C5 & C6)