pectorals major

Question 1

2 heads

Answer 1

clavicular

sternocostal - originates medial anterior thoracic wall
the lateral border is the anterior wall of axilla

Question 2

origin

Answer 2

• medial 1/2 clavicle
• sternum (anterior surface)
• upper 7 costal cartilages
• externa oblique aponeurosis

Question 3

aponeurosis

Answer 3

sheet of white tissue taking the place of tendon in flat muscles w/ wide area of attachment

Question 4

insertion

Answer 4

lateral lip of intertubercular groove

Question 5

muscle fibres w/ more superior origin _____

Answer 5

insert lower + more anteriorly on lateral lip than those w/ more inferior origin

Question 6

action

Answer 6

• adduction

- medial rotation + flexion of arm at shoulder joint

Question 7

to test clavicular head

Answer 7

• abduct arm 90º
• try to move anteriorly against resisitance
• can be seen + palpated

Question 8

to test sterocostal head

Answer 8

• abduct arm 60º
• try to adduct against resisitance
• if functionaing normally it can be seen and palpated