thoracic cavity muscles

Question 1

what are the muscles of the thoracic wall?

Answer 1

levatores cosatrum
serratus anterior
external intercostal muscles
internal intercostal muscles
innermost intercostal
transversus thoracic muscles

Question 2

origin of levatores costarum?

Answer 2

TPs C7-T11

Question 3

structure and function of levatores costarum

Answer 3

12 fan shaped muscles that elevate the ribs and aid in vertebral movement, and proprioception. longus and brevis

Question 4

insertion of levatores costarum

Answer 4

longus: external surface of rib between tubercle and angle, 2 ribs below origin
brevis: 1 rib below origin

Question 5

innervation of levatores costarum

Answer 5

dorsal rami lowest cervical and thoracic spinal nerves (T8, T1-T11)

Question 6

blood supply of levatores costarum?

Answer 6

posterior intercostal arteries

Question 7

action of levatores costarum?

Answer 7

elevate ribs, assist in inspiration, rotate and laterally flex vertebral column

Question 8

origin of serratus anterior?

Answer 8

ribs 1-8 on lateral surface

Question 9

insertion of serratus anterior?

Answer 9

medial border of scap

Question 10

innervation of serratus anterior

Answer 10

long thoracic nerve

Question 11

blood supply of serratus anterior

Answer 11

lateral thoracic, superior thoracic, thoracodorsal arteries

Question 12

actions of serratus anterior?

Answer 12

protract, stabilize scap. assist in upward rotation of scap

Question 13

what are the external intercostal muscles known as?

Answer 13

muscles of inspiration

Question 14

origin of external intercostal muscles?

Answer 14

inferior border of ribs

Question 15

insertion of external intercostal muscles?

Answer 15

superior border of ribs

Question 16

innervation of external intercostal muscles?

Answer 16

intercostal nerves

Question 17

blood supply of external intercostal muscles?

Answer 17

posterior intercostal, anterior intercostal, musculophrenic arteries and costocervical trunk

Question 18

action of external intercostal muscles?

Answer 18

elevate ribs during forced inspiration, support intercostal spaces during inspiration and expiration

Question 19

origin of internal intercostal muscles?

Answer 19

inferior border of ribs

Question 20

insertion of internal intercostal muscles?

Answer 20

superior border of ribs

Question 21

innervation of internal intercostal muscles?

Answer 21

intercostal nerves

Question 22

blood supply of internal intercostal muscles?

Answer 22

posterior intercostal, anterior intercostal, musculophrenic arteries and costocervical trunk

Question 23

action of internal intercostal muscles?

Answer 23

stabilize intercostal space during inspiration and expiration, depresses ribs during forced expiration

Question 24

origin of innermost intercostal muscles?

Answer 24

inferior border of rib

Question 25

insertion of innermost intercostal muscles?

Answer 25

superior border of rib

Question 26

innervation of innermost intercostal muscles?

Answer 26

intercostal nerves

Question 27

blood supply of innermost intercostal muscles?

Answer 27

posterior intercostal, interior intercosal, musculophrenic arteries and costocervical trunk

Question 28

action of innermost intercostal muscles?

Answer 28

act with internal intercostal muscles

Question 29

origin of transversus thoracis?

Answer 29

posterior surfacae of lower sternum

Question 30

insertion of transversus thoracis?

Answer 30

internal surface of costal cartilages 2-6

Question 31

innervation of transversus thoracis?

Answer 31

intercostal nerves

Question 32

blood supply of transversus thoracis?

Answer 32

internal thoracic and anterior intercostal arteries

Question 33

action of transversus thoracis

Answer 33

depress costal cartilages of ribs, likely during expiration