E2 respiratory system MUSCLES

Question 1

Sternocleidomastoid

Answer 1

elevates sternum clavicle and ribs

Question 2

Scalenus anterior

Answer 2

elevates frist rib

Question 3

Scalenus medius

Answer 3

elevates first rib

Question 4

Scalenus posterior

Answer 4

elevates second rib

Question 5

Pectoralis major

Answer 5

elevates sternum and ribs

Question 6

pectoralis minor

Answer 6

elevates second - fifth ribs

Question 7

subclavius

Answer 7

elevates first rib

Question 8

serratus anterior

Answer 8

elevates the upper rib

Question 9

*External intercostals

Answer 9

elevates the ribs and stiffens their interspaces

Question 10

internal intercostals

Answer 10

primarily depress ribs

Question 11

Transversus thoracis

Answer 11

depress second - sixth ribs

Question 12

latissimus dorsi

Answer 12

whole muscle depresses rib cage wall

fibers that insert can elevate **

Question 13

Serratus posterior inferior

Answer 13

depresses lower four ribs

Question 14

lateral iliocostalis cervicis

Answer 14

elevates third through sixth ribs

Question 15

lateral iliocostalis

Answer 15

depresses lower six ribs

Question 16

lateral iliocostalis thoracis

Question 17

lavatores costarum

Answer 17

elevates the ribs

Question 18

quadrates lumborum

Answer 18

depresses lowest rib

Question 19

subcostals

Answer 19

depresses the ribs

Question 20

diaphragm

Answer 20

primary muscle of inhalation
(active force)

separates thorax from the abdomen