Muscles of the Thoracic Wall

Question 0

Insertion of External Intercostal

Answer 0

Superior Border of Ribs Below

Question 1

Origin of External Intercostal

Answer 1

Inferior Border of the Ribs

Question 2

Innervation of External Intercostal

Answer 2

Intercostal Nerve

Question 3

Action of External Intercostal

Answer 3

During forced inspiration; elevates ribs

Question 4

Origin of Internal Intercostal

Answer 4

Inferior Border of the Ribs

Question 5

Insertion of Internal Intercostal

Answer 5

Superior Border of Ribs Below

Question 6

Innervation of Internal Intercostal

Answer 6

Intercostal Nerve

Question 7

Action of Internal Intercostal

Answer 7

During forced respiration: interosseous part depresses ribs; interchondral part elevates ribs

Question 8

Origin of Innermost Intercostal

Answer 8

Inferior Border of Ribs

Question 9

Insertion of Innermost Intercostal

Answer 9

Superior Border of the Ribs below

Question 10

Innervation of Innermost Intercostal

Answer 10

Intercostal Nerve

Question 11

Action of Innermost Intercostal

Answer 11

During forced respiration: interosseous part depresses ribs; interchondral part elevates ribs

Question 12

Origin of Transversus Thoracis

Answer 12

Posterior Surface of lower sternum

Question 13

Insertion of Transversus Thoracis

Answer 13

Internal surface of costal cartilages 2-6

Question 14

Innervation of Transversus Thoracis

Answer 14

Intercostal Nerve

Question 15

Action of Transversus Thoracis

Answer 15

Weakly depresses ribs

Question 16

Origin of External Oblique

Answer 16

External Surfaces of 5th-12th Ribs

Question 17

Insertion of External Oblique

Answer 17

Linea Alba, Pubic Tubercle, and anterior half of iliac crest

Question 18

Innervation of External Oblique

Answer 18

Thoraco-abdominal nerves (anterior rami of T7-T11) and Subcostal Nerve

Question 19

Action of External Oblique

Answer 19

Compress and support abdominal viscera; flex and rotate trunk

Question 20

Origin of Internal Oblique

Answer 20

1) Thoracolumbar fascia

2) Anterior 2/3 of iliac crest, and connective tissue deep to inguinal ligament

Question 21

Insertion of Internal Oblique

Answer 21

Inferior border 10-12th ribs, linea alba, and pubis via conjoint tendon

Question 22

Innervation of Internal Oblique

Answer 22

Thoraco-abdominal nerves (anterior rami of nerves T7-T11)

Question 23

Action of Internal Oblique

Answer 23

Compress and support abdominal viscera; flex and rotate trunk

Question 24

Origin of Transversus Abdominis

Answer 24

1) Internal surfaces of 7th-12th Costal Cartilages
2) Thoracolumbar Fascia
3) Iliac Crest
4) Connective Tissue Deep to Inguinal Ligament

Question 25

Insertion of Transversus Abdominis

Answer 25

Linea alba with aponeurosis of internal oblique; pubic crest, and pubis via conjoint tendon

Question 26

Innervation of Transversus Abdominis

Answer 26

Thoraco-abdominal nerves (anterior rami of T7-T11), subcostal and first lumbar nerve

Question 27

Action of Transversus Abdominis

Answer 27

Compresses and supports abdominal viscera

Question 28

Origin of Rectus Abdominis

Answer 28

Pubic Symphysis and pubic crest

Question 29

Insertion of Rectus Abdominis

Answer 29

Xiphoid Process and 5th-7th costal cartilages

Question 30

Innervation of Rectus Abdominis

Answer 30

Thoraco-abdominal and subcostal nerves (anterior rami of T7-T12 spinal nerves)

Question 31

Action of Rectus Abdominis

Answer 31

Flexes trunk (lumbar verterbrae) and compresses abdominal viscera, stabilizes and controls tilt of pelvis (antilordosis)