Thoracic Wall Muscles

Question 0

External oblique insertion

Answer 0

Linea alba, pubic tubercle and anterior half of iliac crest

Question 1

External oblique orgin

Answer 1

External surfaces of 5th -12th ribs

Question 2

External oblique innervation

Answer 2

Thoraco-abdominal nerves
(anterior rami T7 T11)
Subcostal nerve

Question 3

External oblique action

Answer 3

Compress and support abdominal viscera

Flex trunk and rotate trunk

Question 4

Internal oblique orgin

Answer 4

Thoracolumbar fascia, anterior 2 thirds of iliac crest and CT deep to Inguinal ligament

Question 5

Internal oblique insertion

Answer 5

Inferior borders of 10-12th ribs linea alba and pubis via conjoint tendon

Question 6

Internal oblique innervation

Answer 6

Thoraco-abdominal nerves
(anterior rami T7 T11)
Subcostal nerve and 1st lumbar nerve

Question 7

Internal oblique action

Answer 7

Compress and support abdominal viscera

Flex trunk and rotate trunk

Question 8

External intercostal orgin

Answer 8

Inferior border of ribs

Question 9

External intercostal insertion

Answer 9

Superior border of rib below

Question 10

External intercostal innervation

Answer 10

Intercostal nerve

Question 11

External intercostal action

Answer 11

During forced inspiration elevate ribs

Question 12

Internal intercostal orgin

Answer 12

Inferior border of ribs

Question 13

Internal intercostal insertion

Answer 13

Superior border of rib below

Question 14

Internal intercostal innervation

Answer 14

Intercostal nerve

Question 15

Internal intercostal action

Answer 15

During forced respiration interosseous part depresses and interchondral part elevates

Question 16

Innermost intercostal orgin

Answer 16

Inferior border of ribs

Question 17

Innermost intercostal insertion

Answer 17

Superior borders of ribs

Question 18

Innermost intercostal innervation

Answer 18

Intercostal nerve

Question 19

Innermost intercostal action

Answer 19

During forced respiration interosseous part depresses and interchondral part elevates

Question 20

Transversus thoracis orgin

Answer 20

Posterior surface of lower sternum

Question 21

Transversus thoracis insertion

Answer 21

Internal surfaces of costal cartilages 2-6

Question 22

Transversus thoracis innervation

Answer 22

Intercostal nerve

Question 23

Transversus thoracis action

Answer 23

Weakly depresses ribs

Question 24

Transversus abdominis orgin

Answer 24

Internal services of 7th - 12th ribs costal cartiages thoracocolumbar fascia illiac crest CT deep to inguinal ligament

Question 25

Transversus abdominis insertion

Answer 25

Linea alba with aponeurosis of internal oblique pubic crest

Question 26

Transversus abdominis innervation

Answer 26

Thoraco-abdominal nerves (anterior rami T7 T11) Subcostal nerve and 1st lumbar nerve

Question 27

Transversus abdominis action

Answer 27

compress and support abdominal vicera

Question 28

rectus abdominis orgin

Answer 28

pubic symphysis and pubic crest

Question 29

rectus abdominis insertion

Answer 29

xiphoid process and 5th and 7th costal cartilages

Question 30

rectus abdominis innervation

Answer 30

thoraco-abdominal and sub-costal nerves (anterior rami of T7 - T12 spinal nerves

Question 31

rectus abdominis action

Answer 31

flexes trunk lumbar vertebrae compresses abdominal viscera, stabilizes controls pelvic tilt