Thoracic Muscles

Question 1

What is the Location of Innermost Intercostals

Answer 1

Deepest of the Intercostals, Deep to the Internal Intercostals in the Mid Position of the Intercostal space

Question 2

What is the Origin of Innermost Intercostals

Answer 2

Superior Border of Lower Rib

Question 3

What is the Insertion of Innermost Intercostals

Answer 3

Inferior Border of Upper Rib along much of the Shaft to Sternum

Question 4

What is the Action of Innermost Intercostals

Answer 4

Depresses Ribs

Question 5

What is the Location of External Intercostals

Answer 5

Superficial between Ribs (attachments are continuous with the External Intercostal Membrane and the External Oblique mm)

Question 6

What is the Origin of External Intercostals

Answer 6

Inferior Border or Rib above

Question 7

What is the Insertion of External Intercostals

Answer 7

Superior Border of Rib below

Question 8

What are the Actions of External Intercostals

Answer 8

Elevates Ribs (inspiration), Scalene mm fix Rib1, Synergist to the Diaphragm

Question 9

What is the Innervation of External Intercostals

Answer 9

Intercostal Nerves

Question 10

What is the Location of Internal Intercostals

Answer 10

Deep and at right angles to External Intercostals (attachments are continuous with the Internal Intercostal membrane)

Question 11

What is the Origin of Internal Intercostals

Answer 11

Superior Border of Lower Rib

Question 12

What is the Insertion of Internal Intercostal

Answer 12

Inferior Border of Upper Rib along much of the Shaft to Sternum

Question 13

What are the Actions of Internal Intercostals

Answer 13

Depresses Rib, R12 “fixed” by the Posterior Abdominal wall, Antagonist to the External Intercostal mm

Question 14

What is the Innervation of Internal Intercostals

Answer 14

Intercostal Nerves