Pectoral region and axilla

Question 1

origin of the pectoralis major

Answer 1

medial inferior border of the clavicle

manubrium

sternum

costal cartilages 2-6

external abdominal oblique aponeurosis

Question 2

attachment of pec major

Answer 2

crest of the greater tubercle of the humerus

Question 3

action of the pec major

Answer 3

adducts and medially rotates the humerus

clavicular head flexes the humerus

Question 4

what innervates the pectoralis major?

Answer 4

medial and lateral pectoral nerves

so it has 5 cord levels of innervation which is ALOT

Question 5

pectoralis minor origin

Answer 5

outer surfaces of ribs 3-5 (sometimes 2-4)

Question 6

insertion of pectoralis minor

Answer 6

coracoid process of the scapula

Question 7

action of the pectoralis minor

Answer 7

protracts and depresses the scapula

accessory muscle of inspiration

Question 8

what innervates the pectoralis minor?

Answer 8

medial pectoral nerve (goes through minor to get to major)

C8 and T1

Question 9

origin and insertion of the subclavius

Answer 9

o is the upper border of 1st rib and costal cartilage

insertion is the inferior surface of clavicle

Question 10

action of the subclavius

Answer 10

pulls lateral end of clavicle downward and forward, thereby acting to resist shoulder elevation and protraction (don’t go too far)

Question 11

what innervates the subclavius?

Answer 11

nerve to subclavius C5 and C6