Muscles of the Anterior Thoracic Wall

Question 1

External Intercostals origin

Answer 1

Lower margin of one rib

Question 2

External Intercostals Insertion

Answer 2

Upper margin of the next rib

Question 3

External Intercostals Innervation

Answer 3

Intercostal nn. 1-11

Question 4

External Intercostals Action

Answer 4

• raise ribs during inspiration
• support intercostal spaces
• stabilize chest wall

Question 5

External Intercostals Blood supply

Answer 5

Intercostal aa.

Question 6

External intercostals location

Answer 6

Costal tubercle to costochondral junction

Question 7

Internal & Innermost Intercostals origin

Answer 7

Lower margin of one rib

Question 8

Internal & Innermost Intercostals insertion

Answer 8

Upper margin of the next rib

Question 9

Internal & Innermost Intercostals blood supply

Answer 9

Intercostal aa

Question 10

Internal & Innermost Intercostals innervation

Answer 10

Intercostal nn. 1-11

Question 11

Internal & Innermost Intercostals Actions

Answer 11

• depress the ribs during expiration
• support intercostal spaces
• stabilize chest wall

Question 12

Internal & Innermost Intercostals location

Answer 12

Costal angle to sternum

Question 13

Transversus Thoracis origin

Answer 13

• inner surface of body

- xiphoid process of sternum

Question 14

Transversus Thoracis Insertion

Answer 14

• inner surface of ribs 2-6

- costal cartilages of 2-6

Question 15

Transversus Thoracis blood supply

Answer 15

Internal thoracic a.

Question 16

Transversus Thoracis innervation

Answer 16

Intercostal nn. 2-7

Question 17

Transversus Thoracis actions

Answer 17

Weakly lower ribs during expiration